IME Final Study Guide 1st Trimester PDF

*IME FINAL STUDY GUIDE 1st TRIMESTER* 1. **What is the maximum allowable discharge rate for oily water on ships?** 15 ppm 2. **SO~x~ is controlled by what in fuel?** Amount of sulfur 3. **How many RPMs does a slow speed diesel run at?** 100 RPMs 4. **What is the direction...

*IME FINAL STUDY GUIDE 1st TRIMESTER* 1. **What is the maximum allowable discharge rate for oily water on ships?** 15 ppm 2. **SO~x~ is controlled by what in fuel?** Amount of sulfur 3. **How many RPMs does a slow speed diesel run at?** 100 RPMs 4. **What is the direction of steam flow in a steam turbine?** From high pressure to low pressure 5. **What do bearings do on a turbine?** Support shaft on an oil film 6. **What is viscosity?** Resistance to flow 7. **What is viscosity measured in?** Centistokes 8. **What is innage and ullage?** [Innage]- distance from bottom of tank to top surface of liquid [Ullage]- distance from surface of liquid to top of tank 9. **What gauge is commonly used aboard a ship?** A Bourdon tube 10. **What causes the gauge needle for a Bourdon tube to move?** As pressure builds, the tube wants to straighten out and this movement causes the needle to move 11. **What are pyrometers used to measure?** Temperature 12. **What is 2 bar in PSI?** 11. [*bar* = 14.5 *PSI*  *soooo*.........       2 *X* 14.5 = **29** **PSI**]{.math.inline} 13. **40 L of lube oil is added to an engine. Approximately how much would this be in gallons?** \ [\$\$3.785\\ L = 1\\ gallon\\ sooooo\\ldots\\ldots\\frac{40L}{3.785L} = 10.568\\ gallons\$\$]{.math.display}\ 14. **14 inches of water equals how many PSI?** 27.68 inches of water = 1 PSI soo.......... [\$\\frac{27.68\\ inches}{1\\ PSI} = \\frac{14}{x}\$]{.math.inline}. Cross Multiply.....[27.68*x* = 14]{.math.inline} **X=.50578 PSI** 15. **900 mm of water equals how many inches of water?** 16. [\$25.4mm = 1\\ inch\\ sooooo\\ldots..\\frac{900mm}{25.4} = 35.4331\\ inches1\$]{.math.inline} 17. **What is heat exchange dependent upon?** Conduction and convection 18. **What affects the heat exchange rate in turbines?** Tube wall material, dirt on tubes, area for heat exchange, fluid fill thickness, and difference in temp 19. **What role does zinc play in turbines?** Sacrificial metal that will become eroded and takes wear and tear for condenser 20. **What does a condenser do?** Removes latent heat and changes vapor to liquid 21. **What heat is present when you change water to steam?** Latent heat 22. **What does the condensate pump do?** Takes water and delivers it to condensate system 23. **What kind of heat is added to a turbine to create superheated steam?** Sensible heat (increasing the temp) 24. **What supports the weight of a turbine?** Bearings 25. **When steam is flowing through a nozzle in a turbine, what happens?** Pressure is decreasing while velocity is increasing 26. **What controls the quantity of superheated steam in the ahead direction?** Ahead throttle valve 27. **What is compounding?** When stages are combined in a turbine to harness more power 28. **When running in the head direction, steam flows from where to where?** High pressure to low pressure turbine 29. **To move a vessel in the astern direction, steam must be applied to the stern portion of the what?** Low pressure turbine 30. **What supports the turbine casing at one end(something is needed to permit *expansion*)?** Flexible I-beam 31. **Why do turbines need reduction gears?** They operate up to 6000 rpms and spin at too high of a gear 32. **What restricts you from heating superheated steam?** Material 33. **After steam goes through a nozzle, where does it go?** The blades 34. **Why shouldn't dry steam be used in a low pressure turbine?** Blades will get damaged 35. **What's the function of a rotor in a steam turbine?** Holds moving blades and transmits the force that turns the propellers 36. **Where is steam exhausted to in a low pressure turbine?** Main condenser 37. **Radial clearances are maintained by what in steam turbines?** Bearings 38. **Why do you need a gland to seal steam in a turbine?** Prevents air and steam from coming out and creates vacuum in condenser 39. **As the piston moves up in the cylinder during the compression stroke what happens to pressure and volume?** Pressure increases as volume decreases (temp increases) 40. **What is the distance between top dead center and bottom dead center?** Stroke 41. **In a 2 stroke cycle engine, how many degrees does the crankshaft rotate?** 360 42. **How many degrees does the crankshaft rotate in a 4 stroke?** 720 43. **During the intake stroke on a 4 stroke the piston moves from where to where?** Top dead center to bottom dead center 44. **What connects the piston and connecting rod?** The wrist pin 45. **Where is the air intake valve and exhaust valve located in a 4 stroke?** Cylinder head 46. **What part of the piston absorbs the side thrust?** Skirt 47. **The cam shaft in a 2 stroke cycle engine turns at which of the following when compared to crankshaft speed?** The same rate 48. **The cam shaft in a 4 stroke cycle engine turns at which of the following when compared to crankshaft speed?** 2 revolutions: cam turns HALF 49. **What delivers air at a positive pressure for combustion and is driven by engine exhaust?** Turbocharger 50. **What is the highest point in a cylinder? Lowest?** Top dead center; bottom dead center 51. **During the exhaust stroke in a four stroke engine, the piston moves....?** From bottom dead center to top dead center 52. **In a crosshead type engine the piston is connected to the crosshead by the?** Connecting rod 53. **What is the upper part of a piston called?** Crown 54. **When the piston moves from TDC to BDC air is delivered for combustion as the piston moves down and sucks in air?** Natural aspiration 55. **What meters the fuel in combustion?** Fuel pump 56. **What do you use a controllable pitch propeller for?** To go in reverse 57. **What isn't a main component in a single shaft gas turbine?** Power turbine 58. **How can heat from exhaust be collected?** Recuperator or a waste heat boiler 59. **A gas turbine is what kind of cycle?** Open cycle 60. **A steam turbine is what kind of cycle?** Closed cycle 61. **A Brayton cycle is what kind of cycle?** Can be open or closed 62. **The clutch is what connects and disconnects the gas turbine from the reduction gear. This is referred to SSS clutch. If the engine speed is greater than the reduction gear speed, the engine \_\_\_\_1\_\_\_\_?** Engages 63. **If the engine speed is less than that of the reduction gear?** The engine disengages 64. **What do shaft seals do?** Prevent oil leakage in engine 65. **What are two main elements of a compressor?** Supplying air for combustion and cooling things 66. **A rotor shaft is supported by what?** A bearing 67. **During inoculation, air passes through the compressor and.....?** Pressure increases as volume decreases 68. **Initial ignition in a gas turbine is started by what?** An electric spark igniter 69. **What does a hung start signal?** Insufficient RPM for combustion 70. **During atmospheric conditions, theoretical atmospheric pressure is ?** 12 bar 71. **What is the purpose of a pumping system?** Takes low pressure and pumps it up to a high pressure **8.** 72. **What is suction lift?** Distance from liquid level of tank to centerline of pump (tank is below pump) 73. **What is head?** Centerline of pump to height of fluid/pump 74. **A pump with a static suction head will have to work less than a static suction lift to move the same fluid: TRUE OR FALSE?** True 75. **What does an ejector do?** Gas or vapor sucks up liquid 76. **Is a centrifugal pump positive displacement pump?** No 77. **An eductor has no moving parts. TRUE OR FALSE?** TRUE 78. **How is a pump shaft sealed on a centrifugal pump?** Packing gland and mechanical seal 79. **Since a centrifugal pump cannot lift so it must be primed. How do you do this?** Bleed casing of air and fill with water 80. **What's cavitation?** low pressure causes air bubbles to form, collapses bubbles in suction 81. **Is a rotary pump positive displacement?** TRUE 82. **Is a rotary pump self -lubricating?** TRUE 83. **As wear continues, pump efficiency decreases.** True 84. **Discharge capacity on screw pump is varied by what?** Pitch, length, and number of screws 85. **A reciprocating pump is positive displacement. TRUE OR FALSE.** True 86. **What does a double acting pump do?** Discharges once every stroke and 2 every revolution 87. **What does a suction valve do?** Opens where there is a low pressure in the pump chamber 88. **What happens when you have low pressure in a cylinder chamber?** Valve will open 89. **What does an ejector use?** Steam or gas (educator uses liquid) 90. **Do the lobes touch in a rotary impeller?** NO (position kept by timing gear) 91. **Friction head is the losses in a system due to what?** Pipe wall roughness, fittings in a system, valves in a system, length of piping, and number of turns 92. **What is used to disconnect engine from gearing/maneuvering?** Clutch 93. **What's beneath a reduction gear shaft?** Bearing 94. **When you are in shaft alley, what bearing is found there?** Line shaft bearing 95. **What kind of shaft would have a hollow shaft?** Controllable pitch propeller 96. **What kind of bearing supports the tailshaft and weight of propeller?** Stern tube bearing 97. **A right hand propeller turns\_\_\_\_\_\_\_. And a left hand propeller turns\_\_\_\_\_\_\_\_.** Clockwise. Counterclockwise 98. **Vessels equipped with a \_\_\_\_ \_\_\_\_\_\_ \_\_\_\_\_\_ need the engine to stop completely to go in reverse.** Fixed pitch propeller 99. **How do you slow down in a controllable pitch propeller?** Change pitch 100. **Propeller cavitation that causes pitting at the tips of propellers will increase efficiency.** False 101. **What kind of water is grey water?** Water from shower drains, sinks, galleys, etc. 102. **MSD stands for what?** Marine sanitation device 103. **In a biological MSD, what is present to help consume solid waste?** Micro-organisms 104. **What is maceration?** When sewage is ground up and chopped into smaller pieces 105. **What kind of waste is black water?** Sewage 106. **Can a ship discharge sewage within 3 nautical miles?** NO 107. **What kind of trash can be discharged overboard inside and out of special areas?** Deck wash water with cleaning agents 108. **What should not be put in incinerators?** Aerosol cans 109. **Can you discharge incinerator ash?** NO 110. **Why does oil float on top of water?** Difference in densities 111. **In some bodies of water, what may be used to treat water instead of chemicals?** UV light 112. **When dealing with trash, where should you log it?** Garbage log 113. **Oily water is produced from what?** Bilge pumping 114. **Is maceration used to treat ballast water?** NO! 115. **In a retention type sewage system waste is....?** Stored in a holding tank(retaining unit) until discharge 116. **In a biological sewage treatment plant, why is a blower needed?** Provide air for microorganisms 117. **What kind of trash can be discharged overboard over 12 nautical miles from shore?** Ground food waste 118. **Does heating an oil/water mixture help in separating it?** YES 119. **What is not approved way of treating ballast water?** Mixing of ballast water to change salinity conditions in port 120. **Non indigenous species transfer occurs through ballast water operations.** TRUE 121. **How can CO~2~ emissions be reduced?** Reducing whole following resistance 122. **What does lube oil do?** Cleans, cools, and reduces friction