Farm Power (Part 1).pdf

Institute of Agricultural and Biosystems Engineering (IABE), BPSU Abucay Campus Republic of the Philippines BATAAN PENINSULA STATE UNIVERSITY – ABUCAY CAMPUS Institute of Agricultural and Biosystems Engineering...

Institute of Agricultural and Biosystems Engineering (IABE), BPSU Abucay Campus Republic of the Philippines BATAAN PENINSULA STATE UNIVERSITY – ABUCAY CAMPUS Institute of Agricultural and Biosystems Engineering Bangkal, Abucay, Bataan ABE BOARD EXAM REVIEW 2024 FARM POWER (PART 1) Prepared by: Engr. Ronald E. Garcia MULTIPLE CHOICE: Select the best answer. Encircle the letter that corresponds to your answer in each item. STRICTLY NO ERASURES ALLOWED. 1. PS is a German acronym for: A. Pferdestark C. Pferdestarke B. Pferdstark D. None of these Answer: C. Pferdestarke 2. cv is a French acronym for: A. Cheval-vapeur C. Chevalvapour B. Chevapeur D. None of these Answer: A. Cheval-vapeur 3. pk is Dutch acronym for: A. Paardekracht C. Padkracht B. Pardkract D. None of these Answer: A. Paardekracht 4. One pferdestarke (ps) is equal to: A. 0.986 hp C. 0.735 kW B. 75 kgf-m/sec D. All of these Answer: D. All of these 5. One (1) PS is equal to: A. 735.49 watts C. 760.00 watts B. 740.12 watts D. None of these Answer: A. 735.49 watts 6. One horsepower can generate heat energy equal to: A. 2455 BTU/hr C. 2445 BTU/hr B. 2545 BTU/hr D. None of these Answer: B. 2545 BTU/hr 7. The amount of power available in human for useful work. A. 0.5 hp C. 0.1 hp B. 0.25 hp D. None of these Answer: C. 0.1 hp 8. The minimum energy requirement of human. A. 1,250 cal/day C. 1,750 cal/day B. 1,500 cal/day D. 2,000 cal/day Answer: D. 2,000 cal/day 9. Twenty-hp engine is equal to: A. 1524.44 kg-m/sec C. 1425.44 kg-m/sec B. 1254.2 kg-m/sec D. None of these Answer: A. 1524.44 kg-m/sec Page 1 of 30  Institute of Agricultural and Biosystems Engineering (IABE), BPSU Abucay Campus 10. Ten-hp engine is equivalent to: A. 7.46 kW C. 0.746 kW B. 76.4 Watt D. None of these Answer: A. 7.46 kW 11. The three main sources of power for mechanization include: A. Human, animal & mechanical C. Animal, electrical & mechanical B. Human, electrical & mechanical D. Human, animal & electrical Answer: A. Human, animal & mechanical 12. The gasoline engine is characterized as: A. Low first cost – high operating cost C. High first cost – high operating cost B. Low first cost – low operating cost D. High first cost – low operating cost Answer: A. Low first cost – high operating cost 13. The windmill for water pumping is characterized as: A. Low torque – high speed C. High torque – low speed B. High torque – high speed D. Low torque – low speed Answer: C. High torque – low speed 14. The three-phase electric motor is characterized as: A. Low first cost – high operating cost C. High first cost – high operating cost B. Low first cost – low operating cost D. High first cost – low operating cost Answer: D. High first cost – low operating cost 15. Of corresponding size and speed, single-cylinder engines compared to multi-cylinder engines will require ________flywheels. A. Lighter C. Heavier B. Thinner D. A or B Answer: C. Heavier 16. Ignition of fuel in a gasoline fuel engine usually starts when the piston is: A. Moving downward the bottom dead center C. At the top dead center B. Approaching the top dead center D. None of the above Answer: B. Approaching the top dead center 17. A process of providing the engine with additional amount of air and fuel using a small turbine propelled by engine exhaust gas to increase power by about 30%. A. Turbocharging C. Power charging B. Supercharging D. Air charging Answer: A. Turbocharging 18. One way of increasing engine power is to force more air into the cylinder so that more power can be produced from each power stroke. This process which uses a type of air compression device powered by the engine crankshaft is called: A. Turbocharging C. Power charging B. Supercharging D. Air charging Answer: B. Supercharging 19. What do you call a device that forces more fuel mixture into the cylinders than would be drawn in under normal atmospheric conditions, thus making possible greater power output with the same piston displacement. A. Carburetor C. Throttle B. Supercharger D. Venturi Answer: B. Supercharger Page 2 of 30  Institute of Agricultural and Biosystems Engineering (IABE), BPSU Abucay Campus 20. A turbine and an air blower mounted ahead of the intake manifold of an engine to force more air into the cylinder thereby increasing power output of the engine by 10-15%. A. Turbocharger C. Power inducer B. Auxiliary reducer D. All of these Answer: A. Turbocharger 21. The ratio between the mass of fuel consumed per unit time and the corresponding power measured: A. Specific fuel consumption C. Fuel consumption rate B. Fuel to mass ratio D. None of these Answer: A. Specific fuel consumption 22. The piston goes up and the two valves remain closed is termed: A. Intake C. Power B. Compression D. Exhaust Answer: B. Compression 23. In a compression-ignition engine, the fuel is introduced into the cylinder at the: A. Start of intake C. End of intake B. Start of compression D. End of compression Answer: D. End of compression 24. A valve operates: A. Once per cycle C. Three times per cycle B. Twice per cycle D. Four times per cycle Answer: A. Once per cycle 25. The thermal efficiency range for internal combustion engines is: A. 25 – 36% C. 50 – 75% B. 36 – 50% D. 75 – 90% Answer: A. 25 – 36% 26. An engine valve arrangement wherein the intake and exhaust valves are located on one side of the cylinder block: A. I - head arrangement C. T – head arrangement B. L- head arrangement D. F – head arrangement Answer: B. L- head arrangement 27. An engine valve arrangement wherein the intake and exhaust valves are located in the cylinder head: A. I - head arrangement C. T – head arrangement B. L- head arrangement D. F – head arrangement Answer: A. I - head arrangement 28. An engine with all intake valves in the cylinder head and all exhaust valves in the cylinder block: A. I - head arrangement C. T – head arrangement B. L- head arrangement D. F – head arrangement Answer: D. F – head arrangement 29. Amount of power that the manufacturer specified for an engine: A. Indicated horsepower C. Rated horsepower B. Brake horsepower D. Belt horsepower Answer: C. Rated horsepower Page 3 of 30  Institute of Agricultural and Biosystems Engineering (IABE), BPSU Abucay Campus 30. A device that provides ignition to a gasoline engine: A. Flywheel C. Carburetor B. Fuel injector D. Spark plug Answer: D. Spark plug 31. Compression pressure for small gasoline engine. A. 40 to 70 psi C. 150 to 410 psi B. 75 to 125 psi D. None of these Answer: B. 75 to 125 psi 32. This mixture of 90% gasoline and 10% alcohol is used as a fuel for spark ignition engine. A. Methyl ester C. Gasohol B. Ethyl ester D. Normal heptane Answer: C. Gasohol 33. It is a gasoline fuel additive which helps improves the anti-knocking characteristics of fuels but which has been recently discovered to be dangerous to living beings. A. Methanol C. Tetraethyl lead B. Ethanol D. Gasohol Answer: C. Tetraethyl lead 34. Engine cooling method. A. Air cooled C. Air and water cooled B. Water cooled D. All of these Answer: D. All of these 35. A high-cetane fueled engine uses: A. Diesel as fuel and is difficult to start engine at lower temperature B. Diesel as fuel and is easy to start at higher temperature C. Gasoline fuel and is easy to start at lower temperature D. None of these Answer: B. Diesel as fuel and is easy to start at higher temperature 36. High viscosity engine oil is desirable to use because: A. Its viscosity changes easily with a change in temperature B. Its viscosity does not change easily with the change in temperature C. Its viscosity changes even without a change in temperature D. None of these Answer: A. Its viscosity changes easily with a change in temperature 37. Engine oil having high flash and fire point indicates. A. High boiling point C. High heating value B. High evaporation rate D. All of these Answer: A. High boiling point 38. An additive purposely to provide a protective film on bearing surfaces thus preventing any acid to corrode metal parts. A. Anticorrosive C. Dispersants B. Antioxidants D. All of these Answer: A. Anticorrosive 39. Additives to cause carbon particles in the engine to remain in suspension in oil. A. Anticorrosive C. Dispersants B. Antioxidants D. All of these Answer: C. Dispersants Page 4 of 30  Institute of Agricultural and Biosystems Engineering (IABE), BPSU Abucay Campus 40. In order to increase the resistance of engine oil, the formation of certain acidic product that may cause corrosion of certain type of bearing the recommended additive to use is: A. Anticorrosive C. Dispersants B. Antioxidants D. All of these Answer: B. Antioxidants 41. The burning of portion of fuel in the combustion chamber of an engine at a rate faster than the desired. A. Knocking C. Misfiring B. Detonation D. All of these Answer: B. Detonation 42. A device used to measure the quantity of oil in a crankcase. A. Dipstick C. Oil stick B. Oil gauge D. None of these Answer: A. Dipstick 43. A device that provides a rich mixture of fuel during high load and lean mixture during under load. A. Carburetor C. Fuel regulator B. Economizer D. All of these Answer: B. Economizer 44. The lubrication system of an engine is basically: A. To act seal between the piston and cylinder wall C. To reduce wear and tear of an engine B. To act as complement of the cooling system D. All of these Answer: D. All of these 45. When a diesel engine knocks, the trouble is: A. Incorrect engine lubrication and wrong grade oil C. Incorrect type of spark plug B. The diesel fuel ignition timing is late D. All of these Answer: B. The diesel fuel ignition timing is late 46. When a gasoline engine knocks, the problem is: A. The spark timing is too far advance C. Incorrect type of fuel B. Incorrect type of spark plug D. All of these Answer: A. The spark timing is too far advance 47. If the engine timing is advance: A. The spark plug ignites earlier than the fuel while piston is completing the compression stroke B. The spark plug ignites earlier than the fuel while the piston is at the intake stroke C. The spark ignites earlier than the fuel while moving downward immediately after the power stroke D. All of these Answer: C. The spark ignites earlier than the fuel while moving downward immediately after the power stroke 48. It is the act of checking, testing, measuring, repairing and adjusting the engine in order to bring it to the peak efficiency: A. Trouble shooting C. Timing adjustment B. Tune-up D. All of these Answer: B. Tune-up 49. The rapid explosion of mixture of fuel and air within the cylinder when ignited by spark plug is in: A. Constant temperature combustion C. Constant volume combustion B. Constant pressure combustion D. All of these Answer: C. Constant volume combustion Page 5 of 30  Institute of Agricultural and Biosystems Engineering (IABE), BPSU Abucay Campus 50. The relatively slow burning as the fuel is injected into a highly compressed heated air is: A. Constant temperature combustion C. Constant volume combustion B. Constant pressure combustion D. All of these Answer: B. Constant pressure combustion 51. The gross heating value of diesel is: A. Higher than gasoline C. Higher than ethanol B. Higher than kerosene D. All of these Answer: C. Higher than ethanol 52. Which of the following is true in the operating gasifier for internal combustion engine? A. Only 50 to 70 % of the diesel oil can be replaced by gas producer B. Gasoline and diesel can be fueled with gas producer C. The power output of gasoline engine at arbitrary rpm will increase by 30 to 50 % when fueled with producer gas D. All of these Answer: D. All of these 53. An injection system used in small stationary diesel engine consisting essentially of a high-pressure pump and an injection nozzle: A. Air injection system C. Automized injection system B. Solid injection system D. None of these Answer: B. Solid injection system 54. An engine running at a speed of 2000 rpm is classified as: A. Low speed engine C. High speed engine B. Medium speed engine D. None of these Answer: C. High speed engine 55. In a four-stroke cycle engine, it is the event during which the piston is moving upward and the two valves are close: A. Power C. Compression B. Intake D. Exhaust Answer: C. Compression 56. During this event, fresh supply of fuel enters the cylinder as the piston moves downward and the intake valve opens. A. Power C. Compression B. Intake D. Exhaust Answer: B. Intake 57. In an ideal Diesel engine, the combustion of fuel occurs at: A. Constant pressure C. Constant volume B. Constant temperature D. Constant enthalpy Answer: A. Constant pressure 58. In an ideal Otto engine, the combustion of fuel occurs at: A. Constant pressure C. Constant volume B. Constant temperature D. Constant enthalpy Answer: C. Constant volume 59. How much oxygen does air have? A. 23.2% by volume C. 15.3% by weight B. 23.2% by weight D. 15.3% by volume Answer: B. 23.2% by weight Page 6 of 30  Institute of Agricultural and Biosystems Engineering (IABE), BPSU Abucay Campus 60. This rating is given to diesel fuels for their ability to burn without detonating as compared with the performance of reference fuels: A. Octane rating C. Heptane rating B. Cetane rating D. Alcohol rating Answer: B. Cetane rating 61. For complete combustion of gasoline, how much air is needed? A. 11.1 kg/kg of fuel C. 15.1 kg/kg of fuel B. 12.5 kg/kg of fuel D. 8.2 kg/kg of fuel Answer: C. 15.1 kg/kg of fuel 62. It is an instrument used for testing specific gravity of a liquid. A. Hydrometer C. Viscometer B. Hygrometer D. Density meter Answer: A. Hydrometer 63. It is engine part whose primary function is to maintain uniform engine speed by absorbing some energy during the power strokes and providing power during the idle strokes. A. Governor C. Flywheel B. Accelerator D. Crankshaft Answer: C. Flywheel 64. What part of the internal combustion engine is usually made of cast iron and the primary function is to maintain uniform engine speed by carrying the crankshaft through those intervals when it is not receiving energy from a piston? A. Connecting rod C. Flywheel B. Governor system D. Accelerator Answer: C. Flywheel 65. A four-stroke-spark-ignition engine needs a magneto to operate. A. Contact point C. Gas tank B. Fuel pump D. Float valve Answer: A. Contact point 66. For high-speed engines, the intake valve opens at TDC and closes after BDC. A. 54 degrees C. 44 degrees B. 50 degrees D. 40 degrees Answer: C. 44 degrees 67. Spark-ignition engines use gasoline as fuel. A. Carburetor C. Metering valve B. Injection nozzle D. Plunger Answer: A. Carburetor 68. In a four-stroke cycle engine, compression is the event during which the piston is moving upward and the two valves are close. A. Power stroke C. Compression stroke B. Intake stroke D. Exhaust stroke Answer: C. Compression stroke 69. In a compression-ignition engine, fresh supply of fuel and air mixture enters the cylinder as the piston moves downward and the intake valve opens. A. Power stroke C. Compression stroke B. Intake stroke D. Exhaust stroke Answer: B. Intake stroke Page 7 of 30  Institute of Agricultural and Biosystems Engineering (IABE), BPSU Abucay Campus 70. Among the fuels that belong to the paraffin group, this has three carbon atoms in its molecular structure. It is the main component of LPG. A. Pentane C. Butane B. Ethane D. Propane Answer: B. Ethane 71. This vertical axis windmill has a very low tip speed ratio and power coefficient of less than 0.2. The rotor is usually constructed using a cylindrical tank cut axially into two and installed vertically face to face at an offset position. A. Savonious C. Darrieus B. Cretan D. Multibladed Answer: A. Savonious 72. The ideal air-fuel ratio for using kerosene as an engine fuel is: A. 10:1 C. 13:1 B. 15:1 D. 12:1 Answer: B. 15:1 73. Which of the following is not a typical example of a small single cylinder engine? A. Air-cooled gasoline engine C. Air-cooled diesel engine B. Water-cooled gasoline engine D. Water-cooled diesel engine Answer: A. Air-cooled gasoline engine 74. An engine that burns fuel inside the cylinder: A. External combustion engine C. Sterling engine B. Internal combustion engine D. None of these Answer: B. Internal combustion engine 75. A mechanical breaking up of fuel into spray droplets by high velocity of air passing through a jet. A. Atomization C. Turbocharging B. Carburetion D. None of these Answer: A. Atomization 76. Engine having fuel injected into the combustion chamber near the end of the combustion stroke and is ignited by heat of compression only. A. Gasoline engine C. Steam engine B. Diesel engine D. None of these Answer: B. Diesel engine 77. The sequence by which the cylinder delivers the power stroke. A. Ignition C. Flash point B. Firing order D. None of these Answer: B. Firing order 78. Firing order of 4-cylinder engine. A. 1-2-3-4 C. 1-2-4-3 B. 1-3-4-2 D. None of these Answer: B. 1-3-4-2 79. Firing order for 8-cylinder V piston. A. 1-6-8-4-3-2-7-5 C. Both A and B B. 1-8-7-3-6-5-4-2 D. None of these Answer: C. Both A and B Page 8 of 30  Institute of Agricultural and Biosystems Engineering (IABE), BPSU Abucay Campus 80. Engine system that reduces the temperature of the cylinder. A. Ignition System C. Cooling System B. Carburetor System D. None of these Answer: C. Cooling System 81. The power output of diesel engine, when powered with gas producer at an arbitrary speed will be reduced by: A. 10-20 % C. 50-70 % B. 30-50 % D. None of these Answer: C. 50-70 % 82. The percentage amount of diesel fuel can be replaced by gas producer: A. 20-40 % C. 90-100% B. 50-70% D. None of these Answer: B. 50-70% 83. Type of engine that can be fueled with producer gas. A. Gas engine C. Gasoline engine B. Diesel engine D. All of these Answer: D. All of these 84. The bulk density of rice husk. A. 50-80 kg/m3 C. 140-160 kg/m3 B. 100-120 kg/m3 D. None of these Answer: B. 100-120 kg/m3 85. Type of engine commonly used for tractors. A. 4-stroke-spark-ignition engine C. 2-stroke-spark-ignition B. 4-stroke-compression-ignition D. 2-stroke-compression-ignition Answer: B. 4-stroke-compression-ignition 86. An internal combustion engine that produces two power strokes in two revolutions of the crankshaft. A. Four-stroke cycle engine C. One-stroke cycle engine B. Two-stroke cycle engine D. None of these Answer: B. Two-stroke cycle engine 87. A fuel commonly used for external combustion engine. A. Gasoline C. Biomass B. Diesel D. None of these Answer: C. Biomass 88. Fuel used for constant volume cycle internal combustion engine. A. Gasoline C. Biomass B. Diesel D. None of these Answer: A. Gasoline 89. Which of the following engine requires frequent maintenance? A. Air cooled compression ignition engine C. Spark-ignition engine B. Compression ignition engine D. All of these Answer: C. Spark-ignition engine 90. Engines are not normally used for. A. 4-wheel tractors C. 4-row harvesters B. Power sprayers D. 1-ton rice mills Answer: D. 1-ton rice mills Page 9 of 30  Institute of Agricultural and Biosystems Engineering (IABE), BPSU Abucay Campus 91. Type of engine commonly used for brush cutters. A. 4-stroke-spark-ignition engine C. 2-stroke-spark-ignition B. 4-stroke-compression-ignition D. 2-stroke –compression-ignition Answer: C. 2-stroke-spark-ignition 92. At the downward stroke of a two-stroke cycle gasoline engine, which of the following events takes place? A. Power, Exhaust, and Intake C. Compression, Power, and Compression B. Compression, Exhaust, and Power D. Compression, Power, and Intake Answer: A. Power, Exhaust, and Intake 93. Engine piston displacement will increase if the: A. Piston diameter is increased C. Both A and B B. Piston stroke is increased D. None of these Answer: C. Both A and B 94. This fuel is made by partial combustion of carbonaceous substances like coal, wood, charcoal, sawdust and other similar materials in an atmosphere of air and steam. It is a mixture of carbon monoxide, hydrogen, methane, nitrogen and carbon dioxide. A. Gasohol C. Natural gas B. Producer gas D. Straight-run fuel Answer: B. Producer gas 95. To minimize channel formation inside the gasifier reactor, the superficial gas velocity on the bed of the char should not exceed. A. 8-9 cm/sec C. 20-23 cm/sec B. 15-20 cm/sec D. None of these Answer: A. 8-9 cm/sec 96. The air requirement for gasification of agricultural waste ranged from. A. 10-20 % of stoichiometric air C. 30-40 % of stoichiometric air B. 20-30 % of stoichiometric air D. None of these Answer: C. 30-40 % of stoichiometric air 97. The speed of the engine is automatically regulated by: A. Hand lever C. Flywheel B. Governor D. None of these Answer: B. Governor 98. A type of engine that completes power stroke in one revolution of the Crankshaft. A. Four-stroke cycle C. Both A and B B. Two-stroke cycle D. None of these Answer: B. Two-stroke cycle 99. Number of pistons for 6-cylinder four stroke gasoline engine. A. 3 C. 9 B. 6 D. None of these Answer: B. 6 100. Number of spark plugs for 6 cylinder diesel engine. A. 3 C. 9 B. 6 D. None of these Answer: D. None of these Page 10 of 30  Institute of Agricultural and Biosystems Engineering (IABE), BPSU Abucay Campus 101. How many fuel injection pumps are there in 4-cylinder four stroke cycle diesel engine? A. 1 C. 4 B. 2 D. None of these Answer: A. 1 102. How many fuel injection pumps are there in 4-cylinder four stroke cycle gasoline engine? A. 1 C. 4 B. 2 D. None of these Answer: D. None of these 103. A device which uses fluid power to produce mechanical force and motion. A. Governor C. Actuator B. Accumulator D. None of these Answer: C. Actuator 104. Part of engine that which slides up and down the cylinder and transmits power to the crankshaft. A. Connecting rod C. Piston B. Cylinder block D. Spark plug Answer: C. Piston 105. A device that is used to actuate the throttle of an engine to increase its speed. A. Governor C. Actuator B. Accelerator D. None of these Answer: B. Accelerator 106. Distance of movement piston from the top dead to the bottom dead center. A. Stroke C. Valve clearance B. Bore D. None of these Answer: A. Stroke 107. Reduction of engine speed or flow of fuel. A. Throttling C. Atomization B. Clutching D. None of these Answer: A. Throttling 108. A device that permits the flow of fuel and of burned gases in one direction only. A. Check valve C. Spark plug B. Relief valve D. None of these Answer: A. Check valve 109. A device that provides ignition to a gasoline engine. A. Flywheel C. Fuel injector B. Carburetor D. Spark plug Answer: D. Spark plug 110. During the power stroke, which of the following valve is open? A. Intake C. Intake and exhaust B. Exhaust D. None of these Answer: D. Spark plug 111. Usable power delivered by the engine. A. Indicated horsepower C. Rated horsepower B. Brake horsepower D. None of these Answer: B. Brake horsepower Page 11 of 30  Institute of Agricultural and Biosystems Engineering (IABE), BPSU Abucay Campus 112. A device that meters the fuel air and mixes them into harmonious mixture before the mixture enters the combustion chamber of an engine. A. Governor C. Carburetor B. Air injector D. None of these Answer: C. Carburetor 113. The volume displaced by a piston in making upward and downward stroke. A. Piston displacement volume C. Total volume B. Clearance volume D. None of these Answer: A. Piston displacement volume 114. The power that is required in pulling an implement. A. Brake horsepower C. Power takeoff horsepower B. Drawbar horsepower D. All of these Answer: B. Drawbar horsepower 115. The power that is required in driving a pump shaft. A. Brake horsepower C. Power takeoff horsepower B. Drawbar horsepower D. All of these Answer: A. Brake horsepower 116. The power available at the engine shaft used in driving machinery. A. Brake horsepower C. Power takeoff horsepower B. Drawbar horsepower D. All of these Answer: A. Brake horsepower 117. In a spark ignition system, it prevents arcing in the breaker point and helps intensify the spark in the spark plug. A. Distributor C. Ignition coil B. Condenser D. Secondary winding Answer: B. Condenser 118. It is the ratio of the horsepower output of an engine to the fuel horsepower. A. Mechanical efficiency C. Power efficiency B. Thermal efficiency D. Volumetric efficiency Answer: B. Thermal efficiency 119. This must be high enough in order to self-ignite the air fuel mixture in a diesel engine. A. Compression temperature C. Intake pressure B. Valve compression D. Engine pressure Answer: A. Compression temperature 120. It is a device used to reduce the toxicity of emissions from an internal combustion engine. It works by providing an environment for a chemical reaction wherein toxic combustion by-products are converted to less-toxic substances. A. Muffler C. Turbocharger B. Header D. Catalytic converter Answer: D. Catalytic converter 121. In what type of engine is the fuel introduced into the cylinder at the end of compression? A. 4-stroke-spark-ignition engine C. 2-stroke-spark-ignition B. 4-stroke-compression-ignition D. Both A and B Answer: B. 4-stroke-compression-ignition Page 12 of 30  Institute of Agricultural and Biosystems Engineering (IABE), BPSU Abucay Campus 122. The specific gravity of gasoline is at the range of: A. 0.67 to 0.76 C. 0.85 to 0.91 B. 0.79 to 0.85 D. None of these Answer: A. 0.67 to 0.76 123. The ratio of the clearance volume from the total volume. A. Compression ratio C. Bore stroke ratio B. Air fuel ratio D. None of these Answer: A. Compression ratio 124. Power transmitted to the pistons by the gas in the cylinder. A. Brake horsepower C. Drawbar horsepower B. Indicated horsepower D. Flywheel horsepower Answer: B. Indicated horsepower 125.The space when the piston is at the top dead center. A. Piston displacement volume C. Total volume B. Clearance volume D. None of these Answer: B. Clearance volume 126. How many piston strokes are there in one revolution of a crankshaft. A. One C. Four B. Two D. None of these Answer: B. Two 127. A device which connects or disconnects engine crankshaft to the transmission box or driven machine. A. Differential gear C. Actuator B. Clutch D. None of these Answer: B. Clutch 128. This gas is a mixture of butane and propane and may be used to a considerable extent as engine fuel. A. Biogas C. Producer gas B. LPG D. Natural gas Answer: B. LPG 129. The ideal air-fuel ratio in terms of weight for methane (CH4) is. A. 14.5:1 C. 15.2:1 B. 16.7:1 D. 17.3:1 Answer: D. 17.3:1 130. The ideal air-fuel ratio in terms of weight for cetane (C16H34) is. A. 15:1 C. 14:1 B. 16:1 D. 17:1 Answer: A. 15:1 131. The octane rating of a mixture of 3 liters of normal heptane and 27 liters of isooctane is: A. 50 C. 20 B. 100 D. 90 Answer: D. 90 132. The greatest heat loss for a 4-stroke cycle, spark ignition engine with a thermal efficiency of 23% is attributed to. A. Cooling system C. Exhaust gases B. Friction D. Radiation Answer: C. Exhaust gases Page 13 of 30  Institute of Agricultural and Biosystems Engineering (IABE), BPSU Abucay Campus 133. It is the partial or complete interruption of the fuel flow in the fuel system as a result of vaporization of the fuel and the formation of gas bubbles at some point. A. Stalling C. Detonation B. Vapor lock D. Explosion Answer: B. Vapor lock 134. In the operation of this ideal engine, the combustion of fuel occurs instantaneously such that the pressure rises at constant volume. A. Diesel cycle engine C. Otto cycle engine B. Compression ignition engine D. Carnot cycle engine Answer: C. Otto cycle engine 135. The compression ratio of engines is directly related to its thermal efficiency. Theoretically: A. Otto-cycle engines have higher thermal efficiency than Diesel cycle engines B. Diesel-cycle engines have higher thermal efficiency than Otto-cycle engines C. Otto-cycle and Diesel-cycle engines have approximately equal thermal efficiency D. None of these Answer: A. Otto-cycle engines have higher thermal efficiency than Diesel cycle engines 136. This kind of gasoline can be obtained by breaking up heavy molecules of oil into lighter ones: A. Natural gasoline C. Straight-run gasoline B. Cracked gasoline D. Blended gasoline Answer: B. Cracked gasoline 137. Natural gas consists large of: A. Butane C. Propane B. Pentane D. None of these Answer: D. None of these 138. Engine that burns fuel outside the cylinder: A. Spark ignition engine C. Compression ignition engine B. External combustion engine D. None of these Answer: B. External combustion engine 139. At the intake stroke of a diesel engine, what come in? A. Fuel and air C. Air B. Fuel D. None of these Answer: C. Air 140. A device that creates ignition of fuel in a diesel engine. A. Spark plug C. Carburetor B. Piston D. None of these Answer: B. Piston 141. A Gear oil is used for. A. Engine C. Hydraulic system B. Transmission box D. All of these Answer: B. Transmission box 142. Mean effective pressure for turbo-charge engine. A. 300 psi C. 200 psi B. 200 psi D. All of these Answer: A. 300 psi Page 14 of 30  Institute of Agricultural and Biosystems Engineering (IABE), BPSU Abucay Campus 143. Engine valve that allows the entrance of fuel. A. Exhaust valve C. Check valve B. Intake valve D. None of these Answer: B. Intake valve 144. Mean effective pressure of an engine. A. 120 psi C. 50 psi B. 200 psi D. None of these Answer: A. 120 psi 145. Fuel for compression ignition engine. A. Gasoline C. LPG B. Kerosene D. None of these Answer: D. None of these 146. A term used to describe the resistance of oil to flow. A. Viscosity C. Volume weight B. Cetane Number D. None of these Answer: A. Viscosity 147. Ignition timing for gasoline engine. A. 1-5 deg C. 10-15 deg B. 5-10 deg D. None of these Answer: B. 5-10 deg 148. Ignition timing for diesel engine. A. 5-12 deg C. 20-26 deg B. 17-19 deg D. None of these Answer: B. 17-19 deg 149. Two pistons running at the same time in the same direction but performing different strokes. A. Running mate C. Valve timing B. Firing order D. None of these Answer: A. Running mate 150. An engine which uses oil entirely as lubricant. A. Four-stroke cycle C. Both A and B B. Two-stroke cycle D. None of these Answer: A. Four-stroke cycle 151. An engine that produces more power per unit weight. A. Four-stroke cycle C. Both A and B B. Two-stroke cycle D. None of these Answer: B. Two-stroke cycle 152. A type of engine that completes power stroke in two revolutions of the crankshaft. A. Four-stroke cycle C. Both A and B B. Two-stroke cycle D. None of these Answer: A. Four-stroke cycle 153. Theoretically, the intake valve: A. Opens at BDC/closes at BDC C. Opens at BDC/closes at TDC B. Opens at TDC/closes at TDC D. Opens at TDC/ closes at BDC Answer: B. Opens at TDC/closes at TDC Page 15 of 30  Institute of Agricultural and Biosystems Engineering (IABE), BPSU Abucay Campus 154. In a compression-ignition engine, intake is accomplished when: A. Piston goes down & IV opens C. Piston goes down & EV opens B. Piston goes up & EV opens D. Piston goes up & IV opens Answer: A. Piston goes down & IV opens 155. It is the process of combining the proper ratio of oxygen with a gaseous form of a fossil fuel so it can combust. It usually involves all these stages, from vaporizing a liquid fuel to letting it mix with air and finally moving the mixture to where it can be burned. A. Oxygenation C. Fuel injection B. Carburetion D. Fuel induction Answer: B. Carburetion 156. It is the ratio of the actual weight of fuel inducted by the engine during the intake stroke to the theoretical weight of air that should have been inducted by filling the piston displacement volume with air at atmospheric temperature and pressure. A. Volumetric capacity C. Volumetric efficiency B. Volumetric parameter D. Volumetric measure Answer: C. Volumetric efficiency 157. Among the fuels that belong to the paraffin group, this has three carbon atoms in its molecular structure. It is the main component of LPG. A. Pentane C. Butane B. Ethane D. Propane Answer: D. Propane 158. The sequence of events which make up the cycle of operation of an engine is: A. I-C-P-E C. C-E-I-P B. I-P-C-E D. P-I-C-E Answer: A. I-C-P-E 159. Air-cooled engines are equipped with fins to: A. Increase air velocity C. Increase air volume B. Increase surface area D. Both A and C Answer: B. Increase surface area 160. Engine mechanical efficiency. A. Brake hp over indicated hp C. Friction hp over flywheel hp B. Rated hp over indicated hp D. None of these Answer: A. Brake hp over indicated hp 161. Part of an engine that converts reciprocating motion into rotary motion. A. Crankshaft C. Camshaft B. Piston D. None of these Answer: A. Crankshaft 162. System of number indicating the ignition quality of diesel fuel. A. Octane rating C. Fuel index B. Cetane rating D. None of these Answer: B. Cetane rating 163. A substance that decreases the effect of friction and which is commonly obtained from petroleum products. A. Lubricant C. Grease B. Gear oil D. All of these Answer: D. All of these Page 16 of 30  Institute of Agricultural and Biosystems Engineering (IABE), BPSU Abucay Campus 164. Which pair is mismatched? A. Indirect cooling – water-cooled engine C. Spark ignition – gasoline engine B. Constant volume process – diesel engine D. Otto cycle – gasoline engine Answer: B. Constant volume process – diesel engine 165. Which is not a function of the crankcase? A. Oil reservoir C. Housing for moving parts B. Support for the shafts D. None of these Answer: D. None of these 166. During the power stroke, which of the following valve is open? A. Intake C. Intake and exhaust B. Exhaust D. None of these Answer: D. None of these 167. A steam engine is an example of: A. An internal combustion engine C. A dual combustion engine B. An external combustion engine D. All of these Answer: B. An external combustion engine 168. A constant volume cycle engine: A. Gasoline engine C. Steam engine B. Diesel engine D. None of of these Answer: A. Gasoline engine 169. A constant pressure cycle engine: A. Gasoline engine C. Steam engine B. Diesel engine D. None of of these Answer: B. Diesel engine 170. Fuel used for constant pressure cycle internal combustion engine.: A. Gasoline C. Biomass B. Diesel D. None of of these Answer: B. Diesel 171. In a compression-ignition engine, the fuel is introduced into the cylinder using this device: A. Intake manifold C. Fuel injector B. Intake valve D. None of of these Answer: C. Fuel injector 172. A 16-valve diesel engine usually have: A. A single-piston cylinders C. An eight-piston cylinders B. A six-piston cylinders D. None of of these Answer: C. An eight-piston cylinders 173. The following are the characteristics of diesel engine compared to gasoline engine, except: A. Higher fuel – utilization efficiency C. Higher compression ratio B. Higher fuel consumption D. Higher air-fuel ratio Answer: B. Higher fuel consumption 174. An air-cooled engine is basically equipped with: A. Pump C. Fan and pump B. Fan D. None of these Answer: B. Fan Page 17 of 30  Institute of Agricultural and Biosystems Engineering (IABE), BPSU Abucay Campus 175.When operating light equipment, it is recommended to use.: A. Four stroke gasoline engine C. Four stroke diesel engine B. Two stroke gasoline engine D. All of these Answer: B. Two stroke gasoline engine 176. A four-stroke-cycle engine is advantageous to use than two-stroke-cycle engine for the reason that. A. Has regular intake and exhaust valves C. Easy to lubricate B. It is easier to start the engine D. All of these Answer: D. All of these 177. The act of analyzing, testing, and measuring the engine to remedy the cause and trouble. A. Servicing C. Trouble shooting B. Tune-up D. All of these Answer: C. Trouble shooting 178. Two engines are rated 1 hp and the other is 1 ps. Which of the following statement is true? A. 1 hp engine is stronger than 1 ps engine C. Two engines are the same in strength B. 1 ps engine is stronger than 1 hp engine D. None of these Answer: B. 1 ps engine is stronger than 1 hp engine 179. Japanese engines are usually rated in terms of: A. Horsepower C. Watts B. Pferdestarke D. All of these Answer: B. Pferdestarke 180. A kilogram fuel consumed by an engine per hr per amount of brake power is the: A. Fuel consumption rate C. Specific fuel B. Specific fuel consumption rate D. All of these Answer: B. Specific fuel consumption rate 181. Too little piston clearance will cause: A. Seizing in the cylinder as the engine gets hot C. Loss of oil pumping B. Loss compression D. Imperfect valve timing Answer: A. Seizing in the cylinder as the engine gets hot 182. Small gasoline engine basically has a compression ratio of: A. 3:1 C. 10:1 B. 6:1 D. None of these Answer: B. 6:1 183. It is a device used to generate high voltage current needed for spark plug in small engine. A. Distributor C. Magneto B. Contact point D. All of these Answer: B. Contact point 184. A device that converts energy of animal to useful work. A. Head yoke C. Harness B. Breast strap D. None of these Answer: C. Harness 185. Part of the tractor engine where pistons slide back and forth and are replaced when damaged. A. Cylinder block C. Cylinder head B. Cylinder liner D. All of these Answer: C. Cylinder head Page 18 of 30  Institute of Agricultural and Biosystems Engineering (IABE), BPSU Abucay Campus 186. It is used to seal engine components which are bolted to the sub-frame, the cylinder block, and the crankcase: A. Oil C. Gasket B. Grease D. None of these Answer: C. Gasket 187. A gasoline without ethylene bromide of having an octane rating of 87 which sometimes caused knocking on the engine. A. Premium C. Unleaded B. Leaded D. All of these Answer: C. Unleaded 188. If two animals having 0.75 hp each are harnessed together, the pulling output of the two animals is: A. Greater than 1.5 hp C. Less than 1.5 hp B. Equal to 1.5 hp D. None of these Answer: C. Less than 1.5 hp 189. Compression ring is usually located: A. On top of the oil ring C. Beneath the oil ring B. On the same position with the oil ring D. None of these Answer: A. On top of the oil ring 190. Increasing the engine clearance volume will: A. Have the same compression ratio C. Increase the compression ratio B. Decrease the compression ratio D. None of these Answer: B. Decrease the compression ratio [192-195]Upon regularly checking the engine, some problems were observed such as black exhaust gas, overheating, white exhaust gas and discharging of the battery. 191. What makes the black exhaust gas? A. Insufficient water in radiator C. Clogged filter B. Excessive engine oil D. Faulty alternator Answer: C. Clogged filter 192. What makes the white exhaust gas? A. Insufficient water in radiator C. Clogged filter B. Excessive engine oil D. Faulty alternator Answer: B. Excessive engine oil 193. What makes the overheating? A. Insufficient water in radiator C. Clogged filter B. Excessive engine oil D. Faulty alternator Answer: A. Insufficient water in radiator 194. What makes the discharging of the battery? A. Insufficient water in radiator C. Clogged filter B. Excessive engine oil D. Faulty alternator Answer: D. Faulty alternator 195. A turbine used for hydro system wherein pressurized water is converted to a high-speed jet by letting the water pass through a nozzle. A. Impulse turbine C. Water wheel B. Reaction turbine D. None of of these Answer: A. Impulse turbine Page 19 of 30  Institute of Agricultural and Biosystems Engineering (IABE), BPSU Abucay Campus 196. A turbine for hydro system which runs completely filled with water. A. Impulse turbine C. Water wheel B. Reaction turbine D. None of of these Answer: B. Reaction turbine 197. The average power density of solar heat striking the earth surface. A. 1 kw/m² C. 0.58 kw/m² B. 0.89 kw/m² D. None of of these Answer: B. 0.89 kw/m² 198. Solar battery is rated in terms of: A. Dimension of the battery C. Ampere – hour B. Wattage D. None of of these Answer: C. Ampere – hour 199. Wind pumps are suitable for high ___ operation: A. Torque C. Power B. Speed D. None of of these Answer: A. Torque 200. The greater the number of blades of the wind machine, ___ the torque: A. The higher C. The same B. The lower D. None of of these Answer: A. The higher 201. The ratio of the heat released by the fuel of a heated-air mechanical dryer to the theoretical heat available from the fuel. A. Burner efficiency C. Combustion efficiency B. Furnace efficiency D. None of of these Answer: C. Combustion efficiency 202. These rely on the illumination-spectrum intensity coming from the sun. A. Thermal or heat-based applications C. Photovoltaic applications B. Greenhouse applications D. Solar pond principle Answer: C. Photovoltaic applications 203.A component part of solar electric system that converts sunlight to electricity. A. PV panel C. Solar module B. Solar cell D. All of these Answer: D. All of these 204. If the rotor of the windmill originally at 2 meters is to be reduced to 1 meter, the power output of the machine will be reduced by: A. Two times C. Four times B. Three times D. None of these Answer: C. Four times 205. Wind flows on a 2-m diameter rotor at a rate of 2 m/s. Suddenly, the wind flows at 4 m/s, what would be the power output of the windmill? A. 4 times C. 8 times B. 6 times D. None of these Answer: C. 8 times Page 20 of 30  Institute of Agricultural and Biosystems Engineering (IABE), BPSU Abucay Campus 206. A device used in measuring speed of a wind pump. A. Accelerometer C. Ammeter B. Speedometer D. Tachometer Answer: D. Tachometer 207. Which of the following is not a source of energy for farming? A. Solar energy C. Biomass energy B. Wind energy D. None of these Answer: D. None of these 208. A conventional source of energy. A. Human power C. Fossil fuel B. Draft Animal D. All of these Answer: D. All of these 209. A non-conventional source of energy. A. Biomass C. Wind B. Solar D. All of these Answer: D. All of these 210. It refers to ratio of the kinetic energy of air that a wind rotor can convert into mechanical energy over the theoretical maximum available from the wind. A. Power coefficient C. Betz coefficient B. Torque coefficient D. Speed coefficient Answer: A. Power coefficient 211. It is the theoretical maximum percentage of the kinetic energy of air which a wind rotor can convert into mechanical energy. A. 82.5% C. 59.3% B. 50.5% D. 10.0% Answer: C. 59.3% 212. In an aerogenerator exceeding 100 kw capacity, which part is responsible in converting rotational movement to electricity? A. Rotor C. Alternator B. Turbine D. Governor Answer: C. Alternator 213. What component of force is used in multi-bladed windmills? A. Lift force C. Side force B. Drag force D. Drop force Answer: A. Lift force 214. What component of force is used in savonius windmills? A. Lift force C. Side force B. Drag force D. Drop force Answer: B. Drag force 215.The type of pump is appropriate for multi-bladed windmills? A. Hydraulic C. Reciprocating B. Pneumatic D. Diaphragm Answer: C. Reciprocating Page 21 of 30  Institute of Agricultural and Biosystems Engineering (IABE), BPSU Abucay Campus 216. While the windmill is in operation, what efficiency can exceed 100%? A. Volumetric C. Rotor B. Transmission D. None of these Answer: A. Volumetric 217. What wind energy resource is located about 10-16 km from Earth surface with velocity over 150 kph? A. Terrestrial wind C. Jet stream B. Extra-terrestrial wind D. High wind Answer: C. Jet stream 218. In multi-bladed windpumps, which part is responsible in converting rotational movement to reciprocating action? A. Rotor C. Crank arm B. Connecting rod D. Reciprocating pump Answer: B. Connecting rod 219. What tail type of multi-bladed windpump is more effective for windy areas? A. Hinged side vane C. Manual folding B. Ecliptic D. No tail Answer: A. Hinged side vane 220.In wind farm development, which should be done first? A. Rotor C. Transmission B. Energy demand survey D. Wind velocity measurement Answer: D. Wind velocity measurement 221. In multi-bladed windpump manufacturing, which should be done first? A. Rotor blade C. Tower B. Rotor frame D. Jig Answer: D. Jig 222. To have bigger water displacement volume in windpumps, which should be increased? A. Connecting rod length C. Crank arm B. Rotor diameter D. Well diameter Answer: C. Crank arm 223. In windmill design, what should be the average rotor blade twist angle in degrees to have a tip speed ratio of 1:1? A. 30 C. 60 B. 45 D. 75 Answer: B. 45 224. If typical overall efficiency of savonius windmills is 7-10%, what is the typical overall efficiency of aerogenerators? A. 7-10% C. 18-21% B. 15-17% D. 90-95% Answer: D. 90-95% 225. A 260-kW hydro power plant is classified as: A. Microhydro C. Small hydro B. Minihydro D. Big hydro Answer: B. Minihydro Page 22 of 30  Institute of Agricultural and Biosystems Engineering (IABE), BPSU Abucay Campus 226.MUnder Philippine classification, what is the maximum power rating for microhydro? A. 25 kW C. 75 kW B. 50 kW D. 100 kW Answer: D. 100 kW 227. Photovoltaic cells work by: A. Storing solar energy as electricity for long periods of time B. Amplifying the energy of the sun C. Using solar energy to release electrons from one layer of the cells to migrate to another layer, thereby setting up an electric current D. Both A and C Answer: B. Amplifying the energy of the sun 228. If a coconut tree shades half of solar module, which condition is true? A. Zero voltage C. Zero amperage B. Low voltage D. Low amperage Answer: D. Low amperage 229. In solar panel installation, which positive polarity wire should be connected last to the battery control unit? A. Solar module C. Battery B. Load D. Monitor Answer: C. Battery 230. At 8:00 P.M. in the Philippines, what is the likely voltage reading of a solar home system when all loads are turned on? A. 20-22 V C. 14-15 V B. 16-19 V D. 11-13 V Answer: D. 11-13 V 231. In a sunny 12:00 noon in the Philippines, what is the likely voltage reading of solar battery charger when no battery is being charged? A. 20-22 V C. 14-15 V B. 16-19 V D. 11-13 V Answer: A. 20-22 V 232. In a sunny 12:00 noon in the Philippines, what is the likely voltage reading of solar pump without battery when load is in turned on? A. 20-22 V C. 14-15 V B. 16-19 V D. 11-13 V Answer: B. 16-19 V 233. Material used in solar cells. A. Silicon C. Equal silicon and boron B. Boron D. Silicon with little boron Answer: D. Silicon with little boron 234. Kind of battery useful in solar-powered energy systems. A. Lead-acid battery C. Solar battery B. Automotive battery D. All of these Answer: D. All of these 235.Which battery is designed for slow charging and slow discharging? A. Maintenance-free battery C. Solar battery B. Automotive battery D. All of these Answer: C. Solar battery Page 23 of 30  Institute of Agricultural and Biosystems Engineering (IABE), BPSU Abucay Campus 236. What is the battery nominal voltage of a 4-wheel 90-hp tractor? A. 12 Vac C. 9 Vdc B. 24 Vdc D. 12 Vdc Answer: D. 12 Vdc 237. The connection to the tractor of an erratic battery is to be stopped quickly. What battery terminal should be disconnected first? A. Positive C. Both terminals B. Negative D. Any terminal Answer: A. Positive 238. A new battery is to be installed to a tractor. What battery terminal should be connected first? A. Positive C. Both terminals B. Negative D. Any terminal Answer: B. Negative 239. The battery drains while tractor is not in use. What battery terminal should be disconnected when tractor is not in use? A. Positive C. Both terminals B. Negative D. Any terminal Answer: A. Positive 240. This is the most common cause of short life of lead acid battery. It results when a cell or battery is permitted to remain in a discharged condition for some length of time such that the lead sulfate hardens and cannot be readily converted to its former state. A. Detonation C. Induction B. Sulfation D. Carburetion Answer: B. Sulfation 241. A device that converts electricity to mechanical power. A. Generator C. Rotor B. Motor D. None of these Answer: B. Motor 242. A device that converts electricity from sunlight. A. Generator C. Photovoltaic B. Windpump D. None of these Answer: C. Photovoltaic 243. Wind machine that is used for lifting water. A. Aeropump C. Wind turbine B. Windpump D. Generator Answer: B. Windpump 244. Power generated from falling water. A. Hydro power C. Wind power B. Biomass power D. None of these Answer: A. Hydro power 245. Power generated from moving air. A. Hydro power C. Wind power B. Biomass power D. None of these Answer: C. Wind power Page 24 of 30  Institute of Agricultural and Biosystems Engineering (IABE), BPSU Abucay Campus 246. Which is the oldest form of direct or indirect solar energy? A. Ocean thermal energy conversion C. Photovoltaic B. Flat-plate collectors D. Hydropower Answer: A. Ocean thermal energy conversion 247. When biomass is combined with microorganisms in anaerobic conditions, the result is: A. Methane and nutrient rich sludge C. Butane B. An electric current D. Propane Answer: B. An electric current 248. The power grid is: A. The network of fluid-filled tubes in a roof-mounted solar water heater B. The reaction chamber inside a hydrogen-oxygen fuel cell C. Also called the power tower, and has been taken out of service due to the costs of upkeep D. The network of electrical lines that carry electricity from power plants to the customers Answer: C. Also called the power tower, and has been taken out of service due to the costs of upkeep 249. As a rule of thumb, single-phase alternating current electric motor should be used for applications requiring: A. < 4 hp C. < 6 hp B. < 5 hp D. < 7 hp Answer: B. < 5 hp 250. Indicates the maximum load that can be safely carried by an electric motor under continuous operation: A. Duty rating C. HP rating B. Service factor D. Current rating Answer: B. Service factor 251. Conversion of solid into combustible carbon monoxide through thermochemical reaction. A. Digestion C. Gasification B. Carbonization D. Pyrolysis Answer: C. Gasification 252. It is an indicator of the amount of fuel in a furnace that is converted into ash. A. Burning efficiency C. Heat utilization efficiency B. Thermal efficiency D. None of these Answer: A. Burning efficiency 253. It indicates the ratio of the amount of heat given off by the furnace to the system and the heat used from the fuel. A. Burning efficiency C. Heat utilization efficiency B. Thermal efficiency D. None of these Answer: B. Thermal efficiency 254. Instrument for measuring furnace temperature: A. Glass bulb thermometer C. Thermocouple wire thermometer B. Dial type bimetallic thermometer D. All of these Answer: C. Thermocouple wire thermometer 255. A type of gas producer which has the ability to gasify wet fuel. A. Updraft C. Cross draft B. Down draft D. Fluidized bed Answer: A. Updraft Page 25 of 30  Institute of Agricultural and Biosystems Engineering (IABE), BPSU Abucay Campus 256. A rice hull gasifier reactor that produces less tar during operation. A. Updraft C. Cross draft B. Down draft D. Fluidized bed Answer: B. Down draft 257. The gasification rate of rice hull ranged from. A. 90-105 kg/m2-hr C. 210-240 kg/m2-hr B. 110-210 kg/m2-hr D. None of these Answer: B. 110-210 kg/m2-hr 258. Rice hull gasifier efficiency normally ranged from. A. 50-70 % C. 80-90 % B. 70-80 % D. None of these Answer: A. 50-70 % 259. The caloric value of fuel is. A. The amount of heat contained by the fuel per unit weight B. The heat needed to burn a certain weight of fuel C. The weight of fuel to be heated D. None of these Answer: A. The amount of heat contained by the fuel per unit weight 260. A type of rice husk furnace that burns the fuel while it is being spread in a circular pattern inside the combustion chamber. A. Step grate furnace C. Cyclone furnace B. Suspended air furnace D. All of these Answer: C. Cyclone furnace 261. The thermal efficiency of the furnace is the ratio of: A. The amount of fuel used to the amount of heat generated during combustion B. The amount of heat generated during combustion to the amount of fuel used C. The amount of heat delivered to the amount of heat available in the fuel used D. None of these Answer: C. The amount of heat delivered to the amount of heat available in the fuel used 262. The burning temperature of most agricultural waste. A. 100-200oC C. 500-600oC B. 300-400oC D. None of these Answer: B. 300-400oC 263. The primary gas produced during gasification. A. Methane C. Carbon Monoxide B. Carbon Dioxide D. All of these Answer: C. Carbon Monoxide 264. This fuel is obtained from the fermentation of wet wastes such as animal dung in the absence of oxygen. This gaseous fuel contains up to 60 percent methane. A. Liquefied petroleum gas C. Producer gas B. Carbon monoxide D. Biogas Answer: D. Biogas 265. When a biogas contains 40 % methane and 60 % carbon dioxide. A. The biogas can be used for cooking C. The biogas can be used for lighting B. The biogas can run gas refrigerator D. None of these Answer: D. None of these Page 26 of 30  Institute of Agricultural and Biosystems Engineering (IABE), BPSU Abucay Campus 266. A biogas is generated inside the: A. Gas holder C. Digester B. Mixing tank D. None of these Answer: C. Digester 267. The feed material to water ratio for biogas generation is: A. 1:0.5 to 1:1 C. 1:2 to 1:3 B. 1:1 to 1:2 D. None of these Answer: B. 1:1 to 1:2 268. The percentage primary air requirement based on the total air for the combustion of fuel in a cookstove: A. 80 % C. 40 % B. 60 % D. None of these Answer: A. 80 % 269. Elements necessary for combustion: A. Fire C. Fuel B. Air D. All of these Answer: D. All of these 270. Air required for complete combustion of combustible gasses: A. Stoichiometric air C. Secondary air B. Primary air D. All of these Answer: C. Secondary air 271. The amount of heat required to raise the temperature of one pound water by one-degree Farenheight: A. kCal C. Joule B. BTU D. None of these Answer: B. BTU 272. The excessive amount of tars produced in the combustion of agricultural waste is primary due to: A. Insufficiency of fuel C. Too much air used B. Less air is used D. None of these Answer: B. Less air is used 273. Open-fire stove has a thermal efficiency of: A. 3-11 % C. 20-30% B. 11-20 % D. All of these Answer: A. 3-11 % 274. A chamber where combustion of fuel takes place: A. Damper C. Fire box B. Chimney D. None of these Answer: C. Fire box 275. The thermal efficiency of a cookstove can be increased by: A. Increasing the amount of fuel C. Insulating the stove B. Using more air for the fuel D. None of these Answer: C. Insulating the stove 276. The recommended angle for the inclined metal grates on the step-grate type stove: A. 45-60 deg C. 60-80 deg B. 30-40 deg D. None of these Answer: A. 45-60 deg Page 27 of 30  Institute of Agricultural and Biosystems Engineering (IABE), BPSU Abucay Campus 277. The power output of an agriwaste-fired multiple-burner stove can be increased by: A. Providing large connecting tunnel for the pot holes B. Increasing the height of the chimney C. Providing damper to control the flow of passage of air D. All of these Answer: D. All of these 278. A solid biomass fuel burning device used for domestic cooking water heating, smoking, roasting and simmering: A. Furnace C. Biomass oven B. Cookstove D. None of these Answer: B. Cookstove 279. The primary gas produced during anaerobic digestion of agricultural wastes: A. CH4 & H2S C. CH4 & CO B. CH4 & CO2 D. All of these Answer: B. CH4 & CO2 280. C-N ratio suitable for anaerobic digestion of agriwaste: A. 10:1 to 20:1 C. 30:1 to 40:1 B. 20:1 to 30:1 D. None of these Answer: C. 30:1 to 40:1 281. Cocomethyl ester, also known as biodiesel, is a non-toxic, eco-friendly fuel having similar properties as diesel fuel. The process of transesterifying raw vegetable oil into cocomethyl ester requires the use of. A. Alcohol C. Hydrogen B. Oxygen D. Carbon dioxide Answer: A. Alcohol 282. Which illustrates proper anaerobic digestion process? A. Biomass → saccharification → fermentation C. Biomass → fermentation → liquefaction B. Biomass → fermentation → saccharification D. Biomass → liquefaction → saccharification Answer: A. Biomass → saccharification → fermentation 283. The Ocean Thermal Energy Conversion (OTEC) operating principle resembles a: A. Refrigerator C. Hydro power plant B. Gasoline engine D. Water tank Answer: A. Refrigerator 284. In an Ocean Thermal Energy Conversion (OTEC) system, what causes OTEC fluid to flow and rotate the turbine? A. Bouyancy C. Underwater current B. Fluid pressure D. Temperature difference Answer: D. Temperature difference 285. Which one is not a form of ocean energy. A. Wave C. Transtidal B. Tidal D. Thermal Answer: C. Transtidal 286.The geothermal power system resembles in principle to a; A. Hot air balloon C. Gas pump B. Jet propulsion D. Kettle Answer: D. Kettle Page 28 of 30  Institute of Agricultural and Biosystems Engineering (IABE), BPSU Abucay Campus 287. Which stage comes first in a geothermal power plant development? A. Drilling C. Energy demand survey B. Geophysical survey D. Chemical test Answer: B. Geophysical survey 288. Rotating part of a geothermal power plant which moves the generator. A. Rotor C. Motor B. Rotator D. Turbine Answer: D. Turbine 289. During solar panel installation, which positive polarity wire should be connected last to the battery control unit (BCU)? A. Solar module C. Load B. Battery D. Monitor Answer: B. Battery 290. From the BiGSHOW acronym of renewable energy coverage, what “Bi” stands for? A. Biomass C. Biomass and biofuel B. Biofuel D. Biodiesel Answer: C. Biomass and biofuel 291. It is a toxic chemical with chemical formula CH3OH. Drinking even small amounts can cause blindness. It is used on a limited basis to fuel internal combustion engines, mainly by virtue of the fact that it is not nearly as flammable as gasoline. It is harder to ignite than gasoline and produces just one-eighth of the heat upon burning. It is also called wood alcohol: A. Ethanol C. Gasohol B. Methanol D. Isopropyl alcohol Answer: B. Methanol 292. What energy generating plant does not use turbine for power generation? A. Hydro C. Ocean-thermal B. Geothermal D. Biogas plant Answer: D. Biogas plant 293. The minimum methane content of biogas such that biogas-fueled generators will run. A. 50% C. 65% B. 85% D. 75% Answer: C. 65% 294. If water-manure ratio is 1:1, what is the approximate methane content of biogas? A. 50% C. 70% B. 40% D. 60% Answer: D. 60% 295. In covered lagoon biodigester where solids is less than 3%, what is approximate methane content in biogas? A. 50% C. 70% B. 40% D. 60% Answer: C. 70% 296. The toxic gaseous by-product of geothermal power plants that is trace in biogas. A. Carbon monoxide C. Hydrogen sulfide B. Hydrogen sulfate D. Sulfuric acid Answer: C. Hydrogen sulfide Page 29 of 30  Institute of Agricultural and Biosystems Engineering (IABE), BPSU Abucay Campus 297. In the environment, by how many times is methane destructive than carbon dioxide? A. 2 times C. 10 times B. 21 times D. 16 times Answer: B. 21 times 298. Best type of biogas plant for large-scale animal farms having low solid content of effluents. A. Fixed dome C. Tube-bag B. Floating type D. Covered lagoon Answer: D. Covered lagoon 299. A 4-bladed windpump with 7 meters rotor diameter and 45 degrees twist angle is to be modified due to insufficient starting torque. What should be done? A. Increase twist angle C. Decrease blades B. Increase blades D. Decrease twist angle Answer: B. Increase blades 300. Renewable Energy Act of 2008 is also known as: A. RA 9367 C. RA 8559 B. RA 9513 D. RA 8435 Answer: B. RA 9513 REFERENCES: UPLB Review Materials CLSU Review Materials ABE Board Exam Reviewer by Arthur It. Tambong, 2022 CPU Board Exam Compilation and Review Materials Handouts and fact sheets from various sources Page 30 of 30