Thermofluids Exit Exam Terms PDF

A balloon is filled with cold air and placed in a warm room. All of the following terms included in the second law for open A spark voltage requires voltage of-:220 V Flash point for diesel fuel oil should be - Maximum 49 C The balloon is NOT in thermal equilibriu...

A balloon is filled with cold air and placed in a warm room. All of the following terms included in the second law for open A spark voltage requires voltage of-:220 V Flash point for diesel fuel oil should be - Maximum 49 C The balloon is NOT in thermal equilibrium with the air i n the system except: - Average energy room until: - It stops expanding A system in which there is no exchange of matter with the For a saturated vapor, the relationship between temperature All heat transfer processes: - Involve temperature difference surrounding or mass does not cross its boundaries:-Closed and pressure is given by: - the steam stable A Bell-Coleman cycle is a reversed: - Joule cycle between the bodies system【 For glass wool thermal conductivity changes from sample to A body radiates heat proportional to the fourth power of its Amount of heat liberated by the complete combustion of a A system that is completely impervious to its surrounding or sample due changes in – All of the other choices absolute temperature: - Stefan-Boltzmann Law unit weight or volume of fuel is: - Heating value neither mass nor energy cross its boundaries:- : Isolated system For pure metals, what happens to the thermal conductivity if A Carnot cycle is: - Is bounded by two isotherms and two An adiabatic process with no work done is: - Throttling the temperature is extremely high? - Almost constant except adiabatics on a p – V graph A theoretical gas which strictly follows Boyle’s law and for ferromagnetic materials Charles law of gases:-: Perfect gas A compound pressure gauge is used to measure: - positive An adiabatic process is characterized by which of the For the same heat input and same compression ratio: - and negative pressure following? - The heat transfer is zero A valve in the carburetor of an internal combustion engine Efficiency depends mainly on the working substance which regulates the proportion of air gasoline vapors entering A control volume refers to what? – A fixed region in space An apparatus used for the determination of the concentration the cylinder:-Choke valve For which type of process does the equation dq = Tds hold – of solid or liquid particles dispersed in a gas, - Kapnometer reversible A valve opens 25 before B.D.C. and closes 10 after T.D.C, A device for measuring the velocity of wind - Anemometer An ideal gas is compressed in a cylinder so well insulated that the valve should be:- Exhaust valve Flow measuring devices include all of the following except:-: there is essentially no heat transfer. the temperature of the Magnetic dynamometers A fluid that is incompressible means – density is constant gas – increases An electrically charged atom or radical carries electricity through an electrolyte is called:-Ion For glass wool thermal conductivity changes from sample to A fluid whose stress versus strain rate curve is linear and An instrument commonly used in most research and sample due changes in:- All the other choices passing through the origin. - Newtonian engineering laboratories because it is small and fast among A finely divided carbon deposit by the smoke or flame is the other thermometers. - Thermocouple called:-: Soot Graduations in the properties of elements from one element A gas produced by the combustion of fuel oil and cannot be to the next are less pronounced in:- Groups found in the flue gases is: - Hydrogen An instrument for measuring specific gravity of fluids: - Adiabatic heat transfer within a vapor cycle refers to:- The hydrometer transfer of energy from one stream to another in a heat Gas being heated at constant volume is undergoing the A heat exchanger in which the fluid flows at an angle to the exchanger so that the energy of the input process of-: Isometric second fluid - Cross flow An instrument for testing the resistance of materials to fading when they are exposed to artificial sunlight or ultraviolet light At 101.325 kPa, the boiling point of water is 100C. If the Heat is: - Energy transferred by virtue of a temperature A heat engine is supplied heat at rate of 30,000J/s gives an under. – Fadometer pressure is decreased, the boiling temperature will:-: difference output of 9kW. The thermal efficiency of the engine is: - 30% Decrease An instrument for the determination of the composition of the Heat is conducted in the direction of – Decreasing A hot block is cooled by blowing cool air over its top surface. gas mixture by measuring variations in the thermal At critical point the latent enthalpy of vaporization is:-Zero Temperature The heat that is first transferred to the air layer close to the conductivity - Kathamometer Automobile radiator is filled with:-: Soft water block is by conduction. – Convection Heat normally flows from a high temperature body to a low An instrument used for measuring evaporation, generally that Brayton cycle has - Two isentropic and two constant pressure temperature body wherein it is impossible to convert heat A leak from faucet comes out in separate drops. Which of the of water, into the atmosphere. – Atmometer processes without other effects:- Second law of thermodynamics following is the main cause of this phenomenon? - Surface tension An instrument used for measuring radiant energy especially Both Stirling and Ericson engines are:-: External combustion How is the quality (x) of a liquid-vapor mixture defined?- The in the thermal region. - Kampometer engines fraction of the total mass that is saturated vapor A passive restraint device consisting of bags in front of the driver and passenger - Air bag An instrument used to measure the density of gases is Clog point of an oil refer to: - the temperature at which Heat exchange process where in the product of pressure known as: - Aerovane paraffin ad waxes in oil start precipitating and volume remains constant called: - Hyperbolic process A process in which the system departs from equilibrium state only infinitesimally at every instant. - quasi-static process An instrument used to measure the humidity in the air. – Concerned with the relations between velocities and Hot spots - Are the spots where heavier functions of fuel are Hygrometer accelerations and the forces exerted of fluids in motion – vaporized A process which gives the same states/conditions after the Hydrodynamics system undergoes a series of process - Quasi-static An instrument used for measuring pressure, flow velocity and How do you call of removing of impurities from a gas by process discharge rate of a fluid flowing in a conduit - Flowmeter Cross wire grooves on tires - Absorb shocks because of bubbling it through a liquid purifying agent? – Gas scrubbing road unevenness A rule which states that any waste derived from the treatment An Orsat apparatus is used for - Volumetric analysis of the How does an adiabatic process compare to an isentropic of a hazardous waste remains a hazardous waste - flue gases Closed cycle where water is the working fluid:-: Steam power process? - both Heat transfer = 0 ; Isentropic : Reversible Increases cycle An instrument for testing the resistance of materials to fading How much is the part of light that is absorbed by the body that A spark voltage requires voltage of: - 220 V when they are exposed to artificial sunlight or ultraviolet light Cryogenics is the science of:-: Low temperature transmits and reflects 80% and 10% respectively? - 10% under controlled condition - Fadometer Detonation of pinging noise is due to - Late timing of fuel If a substance's temperature is greater than the saturation A steam nozzle changes - Heat energy into kinetic energy API gravity of water is: - 10 injection temperature, the substance is a:-: Superheated vapor A substance is oxidized when which of the following occurs? Analysis of the composition of fuel which gives on mass Diesel cycle consists of: - two isentropic, one constant In a confined gas, if the absolute temperature is held - It loses electrons basis, relative amounts of moisture content, volatile matter, volume and one constant pressure processes constant, the volume is inversely proportional to the absolute fixed carbon and ash - Proximate analysis pressure:-: Boyle’s law A substance that exists, or is regarded as existing, as a Dry air can be approximated as __% oxygen and __% continuous characterized by a low resistance to flow and the At atmospheric condition, hydrocarbon molecules with a low nitrogen by mole numbers. - 21% and 79% In a four-stroke engine if a valve opens 25 before B.D.C. and tendency – fluid number of carbon atoms, 1 to 4 are – Gases closes 10 after T.D.C, the valve should be:- Exhaust valve During an adiabatic, internally reversible process, what is true A substance that is able to absorb liquids or gasses and is At critical point the latent enthalpy of vaporization is – Zero about the change in entropy? - it is always zero In conduction heat transfer, what happens to the heat transfer used for removing them from a given region or medium. - per unit time when the thermal conductivity decreases?-: The Absorbent During the fusion process, mass is lost and converted to heat flow will decrease At what particular condition that no more heat can that be energy according to - Einstein’s Law A system in which there is a flow of mass across its removed from a substance and the temperature can no In convection heat transfer, what happens to the heat transfer boundaries - Open system longer be lowered? – Absolute Zero During stagnation process, the kinetic energy of a fluid is coefficient if the viscosity of the fluid increases?- the heat converted to enthalpy which results in an: - Increase in the transfer coefficient also increases A thermodynamic system that generally serves as a heat At 101.325 kPa, the boiling point of water is 100C. If the fluid temperature and pressure source or sink for another system. - Heat reservoir pressure is decrease, the boiling temperature will: - In sugar mills, cane juice is evaporated in:- Long vertical tube Decrease Each of the following is correct values of standard evaporators A thermodynamic system that operates continuously with atmospheric pressure except – 1013 mmHg only energy (heat and work) crossing its boundaries; - Heat Atomic weights of the elements in the periodic table are not In an Otto engine, the heat is added during- Isometric engine whole numbers because of: - The existence of isotopes Elements with different atomic weight but same atomic process number are: - Isotopes A valve in the carburetor of an internal combustion engines Automobile radiator is filled with: - Soft Water In the polytropic process PV=constant, if the value of n is which regulates the proportion of air gasoline vapors entering Enthalpy of an ideal gas is a function only of – Temperature infinitely large, the process is called:- isometric the cylinder - Choke valve Average pressure on a surface when a changing pressure condition exists – Mean effective pressure Ericsson cycle consists of the following processes: - Two In turbine installation, the air is removed from the condenser A water temperature of 18 F in the water cooled condenser adiabatic and two constant pressures by- Air ejector is equivalent in C to – 10 A body radiates heat proportional to the fourth power of its absolute temperature - Stefan-Boltzmann law Equation of state for a single component can be any of the Is a measure of the energy that is no longer available to Absolute pressure – The pressure measured above a following except - a mathematical expression defining a path perform useful work within the current environment:- perfect vacuum A body whose emissivity is less than 1 is known as a real between states Absolute entropy body. What is the other term for real body? - Gray body According to Clausius statement – A and C Equilibrium condition exists in all except which of the following It is a form of energy associated with the kinetic random A correction of LMTD is essential in case of - Cross flow heat - In a steady flow process motion of large number of molecules:-: Heat According to Prevost theory of heat exchange, - All bodies exchanger above absolute zero emit radiation Exhaust gas leakage into the cooling system is most likely If n = 1 in a polytropic process for an ideal gas means that the A hot block is cooled by blowing cool air over its top surface. occur because of defective: - Cylinder head gasket process is : - Isothermal According to Pettlier Thompson effect: - Work cant’s be The heat that is first transferred to the air layer close to the converted into heat block is by conduction. It is eventually carried away from the Exhaust stroke of gasoline engine is also known as – If one end of the manometer is open to the atmosphere, it is surface by ______.- Convection Scavenging called - open manometer Advection – The transfer of air and air characteristics by horizontal motion A fur coat on an animal will help the animal to remain:- Warm Exhaust gas leakage into the cooling system is most likely to If the actual kinetic energy of a nozzle is Ka and Ki is the in winter occur because of defective:-: Cylinder head gasket maximum valve that can be attained by an isentropic All of the following are true of non-stoichiometric reactions expansion from an initial to final state - Ka/Ki except - Non-stoichiometric reactions are rare in the A laminated glass on cracking: - Sandwiched layer taps the Engine oil is generally changed after:-2500-6000 km combustion process fragments If the outermost radius of insulation is greater than the critical Exhaust gas leakage into the cooling system is most likely to radius of insulation, the heat transfer rate - Increases All heat transfer processes require a medium of energy A passive restraint device consisting of bags in front of the occur because of defective:-: Cylinder head gasket exchange except: - Radiation driver and passenger:- Air bag It refers to the ratio of the rate of the heat transferred by Engine oil is generally changed after:-2500-6000 km conduction to the rate of the energy stored. - Fournier All of the following processes are irreversible except. – An A reservoir that supplies energy in the form of heat is called:- number isentropic compression of a perfect gas : Source It refers to the ratio of the internal thermal resistance of a solid One of the consequences of Einstein’s theory relatively is that The Fahrenheit scale was introduced by Gabriel Fahrenheit The relationship between the total pressure of a mixture of to the boundary layer thermal resistance - Biot number mass may be converted into energy and energy into mass, - of Amsterdam, Holland in what year? – 1720 non-reacting gases and the partial pressures of constituents 2.7797 x 1010 cm/s is given by: - Dalton’s Law It is the heat energy transferred to a substance at isobaric The firing order in case of four cylinder in engines is generally process - Enthalpy Otto cycle consists of:- Two isentropic and two constant - Either 1-3-4-2 or 1-4-3-2 The smallest subdivision of an element that can take place in volumes processes a chemical reaction is a/an - Atom In a four stroke engine, for the combustion of one liter of fuel, The following are all characteristics of non-metals except: - the volume of air needed would approximately – 9-10 cu. M One watt is:- 1 Nm/s Being reducing agents The solid – liquid equilibrium of Antimony is at what temperature - 630.5 C In a P-T diagram of a pure substance, the curve separating Percent excess air is the difference between the air actually The force of gravity on unit in volume is - Specific Weight the solid phase from the liquid phase is - Fusion curve supplied and the theoretical air divided by - The theoretically The solid – liquid equilibrium of Gold is at what temperature? air supplied The general chemical formula of a paraffin fuel is - CnH2n+2 – 1063 C In a steady flow system, the mass of the working substance Pipes in parallel arrangement have - Equal Head Loss The heat energy transferred to a substance at a constant The solid – liquid equilibrium of Mercury is at what is – Always conserved pressure process is – Enthalpy temperature? - -38.87°C Poor compression in a two stroke engine cannot be because In a vehicle the most probable cause for hard steering may of: - Leaky Valves The heat for radiation by a black body is given by - Stefan- The solid – liquid equilibrium of Silver is at what temperature be: - Any of the other choices Boltzmann Law - 960.8 C Piston rings are made of:- Cast iron In an actual gas, the molecular collisions are – inelastic The heat needed by the body to change its phase without The solid – liquid equilibrium of Tim is at what temperature? Properties of non-reacting gas mixtures are given by:-: changing its temperature. – latent heat – 231.9 C In an oxidation – reduction chemical reaction, all of the Volumetric weighting for molecular weight and density, and following occur except: - Nuclear fusion geometric weighting for all other properties except entropy The heat needed to change to change the temperature of the The solid – liquid equilibrium of Tungsten is at what body without changing its phase. – Sensible heat temperature? – 1774 C In conduction heat transfer, what happens to the heat transfer Pitot tubes are used to measure:-: Flow velocity per unit time when the thermal conductivity decreases? - the The heat of vaporization involves the change in enthalpy due The specific gravity of a substance is the ratio of its density to heat flow will decrease Radiation heat transfer is described by:- Fourier’s Law to: - the change in phase in phase from liquid to gas the density of: - water In convection heat transfer, what happens to the heat transfer Represents the temperature an ideal gas will attain when it is The heat transfer term in the first law of thermodynamics may The structured designed to prevent the spread of fire having coefficient if the viscosity of the fluid increases? - the heat brought to rest adiabatically:-: Stagnation temperature be due to any of the following except: - Internal heat a fire resistance rating of not less than four hours? – Fire wall transfer coefficient will decrease generation (e.g., chemical reaction) Solubility of a gas in a liquid at small concentration can be The temperature measurement in an ordinary thermometer In flow process, neglecting KE and PE changes vdP represented by which law? – Henry’s Law The instrument that is used to check the state of charge of which has constant specific humidity: - Dew point represent which item below - shaft work battery is called - Hydrometer temperature Specific heat capacity is an SI delivered unit describe as - In fluid flow, if the fluid streamlines travel parallel to each other kJ/kgK Thee king pin inclination is generally – Between 2 and 5 The temperature potential between temperature at the two and the paths of individual particles do not cross, the flow is ends of a heat exchanger are given by: - the logarithmic said to be - Laminar States that it is impossible to devise a cyclically operating The law which states that “the ratio of the emissive powers to mean temperature difference device, the sole effect of which is to absorb energy in the form absorptivities are equal when the two bodies are in thermal - In Maxwell’s theory for thermal conductivity of gases and - Kelvin-Planck statement Kirchoff’s law of radiation The temperature at which lubricating will form a cloud. - vapors, which of the following is the value of “a” for triatomic Cloud point gases – 1.7 Starting motor current may be about – 25 A The law which states that the pressure of a gas is constant the volume is directly proportional to the absolute The transfer of air and air characteristics by horizontal motion In natural convection a heated portion of a fluids moves Stagnation enthalpy represents the enthalpy of a fluid when temperature - Charles’ law is called - Advection because: - Its density is less than that of the surrounding fluid it is brought to rest: - Adiabatically The liquid – vapor equilibrium of Oxygen is at what The triple point of a substance is the temperature and In order to emit electromagnetic radiation, an object must be Superheated vapor behaves - approximately as a gas temperature? - -182.97 pressure at which: - The solid does not melt, the liquid does at a temperature: - Above 0 K not boil, and the gas does not condense The measure of the randomness of the molecules of a In Stirling engine, the heat is added during – Isothermal To measure the clearance between the valve and tappet of substance. - entropy The thermal efficiency of a dual cycle engine with fixed process an automobile engine we use a - Feeler gauge compression ratio and fixed quantity of heat and with The minimum cranking speed in petrol engine is: - 60-80 rpm increase in pressure ratio, will – Increase In the absence of any irreversibilities, a thermoelectric generator, a device that incorporates both thermal and The amount of heat needed to raise the temperature one lb The nature of flow of a fluid inside a tube, whether it is The two metals were kept together at room temperature and electric effects, will have - Carnot cycle of water one degree Fahrenheit is: - BTU turbulent or laminar, can be ascertained by - Reynolds it was found out that one is - the thermal conductivity of one metal is as high as compared to the other In the cam, the distance between the base circle and the The attractive force between molecules of the same The passing of heat energy from molecule to molecule nose is known as – Lift substance - Surface Tension through a substance – Conduction The volume of fluid passing a cross-section of steam in unit time – Discharge In the flow process, neglecting kinetic and potential energies, The basis for Bernoulli’s law for fluid flow is: - the principle of The percentage of heat released from fuel-air mixture, in an the integral of Vdp represent what - Shaft work conservation of energy internal combustion engine which is converted into useful The Beattie-Bridgeman equation of state is quite accurate in work is roughly: - 20-25% cases of:- Densities less than about 0.8 times the critical In the polytropic process, if the value of n is indefinitely large, density The Beattie-Bridgeman equation of state is quite accurate in then the process is – Isometric cases of: - Densities less than about 0.8 times the critical The pitot tube is a device used for measurement of – velocity density The Bureau of Standards uses, among others, liquid-vapor In the polytropic process we have pvn = constant, if the value equilibrium of Nitrogen at:-: (-196°C) The pressure exerted in a vessel by a mixture of gasses is of n is infinitely large, the process is called - Constant volume The Bureau of Standard uses, among others, the liquid – equal to the sum of the pressure that each separate gas process vapor equilibrium of hydrogen at. - -253 C would exert - Dalton’s Law The coefficient of contraction is the ratio of the:-Area of vena contracta to the orifice area In the processing section, there is an instrument frequently The Carnot refrigeration cycle includes all of the following The pressure measured from the level of atmospheric used to measure the flow rate of fluids – Rotameter processes except: - Isothermal heating pressure by most pressure recording instrument like The emf is a function of the temperature difference between pressure gage – Gage pressure junctions, a phenomenon called:-Seebeck effect In which direction the heat is transferred through conduction? The Clapeyron’s equation is applicable to: - A change of state – Decreasing temperature when two phases are in equilibrium The pressure measured above a perfect vacuum – Absolute The efficiency of hydraulic braking system is:-About 90% pressure Is a dimensionless number interpreted as the ratio of inertia The condition as identified through the properties of the The first law of thermodynamics is based on which of the forces to viscous forces in the fluid – Reynold’s number substance, generally defined by particular values of any two The properties of fluid at stagnation in state are called: - following principles?- Conservation of energy independent properties. - State Stagnation state Is a simple method of determining the static pressure in a The function of a superheater is to:-: Exchange heat to pipe or other vessel – Piezometer tube The convergent section of a nozzle increases the velocity of The properties that are independent of the mass the system increase energy of the flow the flow of the gas. What does it to do on its pressure? – It such as temperature, pressure, density and voltage - Is one whose pressure is higher than saturation pressure decreases the pressure intensive properties The heat needed by the body to change its phase without corresponding to its temperature – Compressed Liquid changing its temperature:- Latent heat The constant pressure gas turbine works on the principle of - The process in which heat energy is transferred to thermal Is the condition of pressure and temperature at which a liquid Brayton cycle energy storage device is known as: - Regeneration The ideal cycle based on the concept that the combustion and its vapor are indistinguishable. - Critical point process is both diesel and gasoline in the combination of heat The combination of conditions that best describes a The radiation from flames is having – All of the other choices transfer processes that is constant pressure and constant Is the ignition rating of gasoline - Octane number thermodynamic process is given by which of the following? - volume:- Dual cycle I only The ratio of change in unit pressure to the corresponding Is the pressure a fluid exerts on immerse object or container volume changer per unit volume. - Bulk Modulus of Elasticity The internal combustion engines never work in:-: Rankine walls - Hydrostatic pressure The dimension of “acceleration x mass” is the same as that cycle of – Weight The ratio of the gas constant to Avogadro’s number is: - Isentropic flow is - reversible adiabatic flow Boltzmann’z constant The latent heat of vaporization in joules per kg is equal to:- The device that is used for reducing the exhaust noise is 22.6 x 105 Kinematics and dynamic viscosity vary from each other only called – Muffler The ratio of the radiation of actual body to the radiation of a by a factor equal to the: - Fluid Density blackbody is known as - Emmitance The lowest portion to storage basin from where the water is The device that measures the temperature by the not drawn is:- Dead storage Latex is: - A milky juice of rubble electromotive force. - Thermocouple The rate at which an object radiates electromagnetic energy does not depend on its: - Mass The maximum possible work that can be obtained in a cycle Least value of Prandt’l number can be expected in case of – The effectiveness of a body as a thermal radiator at a given operating between two reservoirs is found from:-: Carnot Liquid Metals temperature – Emissivity efficiency The rate at which heat flows through a slab of some material does not depend on which of the following? - The specific Loss power is due to - Low injection pressure The efficiency of hydraulic braking system is: - About 90% heat of the material The matching model and full-scale prototype results in a fluid dynamic phenomenon involving a fully submerged body requires equality of:- : Reynolds Number Measure the diffuser’s ability to increase the pressure of the The equation s = cp ln (T2/T1) determine the change in The rate of radiation does not depend on which of the fluid is: - Pressure recovery factor entropy for a reversible ideal-gas process which is: - Isobaric following? - The thickness of the radiating body The minimum amount of air required for a complete combustion of fuel is called:-: Theoretical air Mechanical energy of pressure transformed into energy of The equation Cp = Cv + R applies to which of the following? The relationship between the concentration of products and heat: - Enthalpy - Ideal Gas reactants in a reversible chemical reaction given by – The equilibrium constant The natural direction of the heat flow between two reservoirs is dependent on:-Their temperature difference Most commercially available petroleum lubricating oil The elongation and compression of a helical spring is an deteriorates staring from operating temperature of: - 200F example of - reversible process The products of complete combustion of gaseous What do you call the passing of heat energy from molecule Which of the following is not a unit of pressure – kg/m-s Which of the following best describes the function of a heat hydrocarbons:-: Carbon monoxide to molecule through a substance? - Convection exchanger?- Transfer heat from one fluid to another Which of the following is not a prefix used in naming isomers? The rate of radiation does not depend on which of the What equation applies in the first law of thermodynamics for - Bi Which of the following is a type of water turbine?- Pelton following?- The thickness of the radiating body an ideal gas in a reversible open steady-state system? - Q + WHEEL vdp = h2 - h1 Which of the following is the S.I. unit of thermal conductivity? The relationship between the total pressure of a mixture of - KJ/m-hr-C Which of the following is a thermodynamic property of a non-reacting gases and the partial pressures of constituents What fuel gas obtained by the destructive distillation of soft system?-: Entropy is given by:-: Dalton’s law coal – Coal gas Which of the following is the color of iron when it its heated to a highest temperature? – White Which of the following is the science of low temperature? - The solid-liquid equilibrium of Mercury is at what What happens to the thermal conductivity of diatomic gases Cryogenics temperature?-: [-38.87°C] if the temperature is increase? - The thermal conductivity will Which of the following is the primary function of a thermal also increase radiator - To transfer heat with or without a medium Which of the following is not a unit of the rate of heat transfer?- The solid-liquid equilibrium of Antimony is at what : BTU/hp-hr temperature?-: [630.5°C] What is referred by control volume? - fixed region in space Which of the following is the science of low temperature? - cryogenics Which of the following is the driving force in heat transfer?- The solid-liquid equilibrium of Gold is at what temperature?-: What is the expression for the heat of vaporization – hg-hf Temperature gradient [1063°C] Which of the following is the best definition of enthalpy? - The amount of useful energy in a system Which of the following is the most efficient thermodynamic The specific gravity of a substance is the ratio of its density to What is the area under curve of a temperature entropy cycle?-Carnot cycle the density of:- Water diagram? – Heat Which of the following is not a unit of the rate of heat transfer? - BTU/hp-hr Which of the following is used for fighter jets?- Turbojet The surface tension of water is 0.072 N/m. Find the weight of What is the chemical formula of an aromatic type of water in μN supported by surface tension in a capillary tube hydrocarbon fuels? - CnH2n-6 Which of the following is true for any process - S(surrounding) Which of the following is true for any process?-: with a radius of 0.21 mm: - 95.00 ± 1 + S(system) > = 0 S(surrounding) + S(system) >= 0 What is the function of a steam separator? - Trapping the The temperature of a pure substance at a temperature of steam and letting water through Which of the following is the structured designed to prevent Which of the following is not a good conductor of heat?- absolute zero is:-Zero the spread of fire having a fire resistance rating of not less Asbestos What is the heat transfer due to density differential? – than four hours? – Fire wall The thermal efficiency of gas vapor cycle as compared to the Convection Which of the following liquids has the highest thermal steam turbine or gas turbine:-: Greater than Which of the following is generally used to measure the conductivity?-: MERCURY What is the lowest pressure in the saturation condition of any temperature inside the furnace? - Optical pyrometer The transmission of heat from one place to another by fluid pure thermodynamic substance? – Triple Point Which of the following needs to be filtered in a diesel engine?- circulation between the spots of different temperatures is Which of the following is used as entrainer in acetic acid- : Air, diesel oil, and lubricating oil called:-: Convection What is the main power generating plant that produces the water separation? - Butyl Acid most electricity per unit thermal energy in the fuel input – Disel Which instruments is used to measure humidity of the The triple point of a substance is the temperature and Turbine Which of the following measures the density of salt in the atmosphere continuously? Hydrograph pressure at which:-: The solid does not melt, the liquid does water - Salimeter not boil, and the gas does not condense What is the origin of the energy conservation equation used Which of the following is used in a thermal power plant?-: in flow system - First law of thermodynamics Which of the following needs to be filtered in a diesel engine? Rankine The type of filter where the filtering element is replaceable:-: - Air, diesel oil and lubricating oil METAL edge filter What is true about the polytropic exponent, n, for a perfect Which of the following refers to a form of energy associated gas undergoing an isobaric process? - n = 0 Which of the following requires the greatest amount of heat with the kinetic random motion of large numbers of The volume of fluid passing a cross-section of stream in unit per kilogram for a given increase in temperature? – Water molecules?-: Heat time:-: Discharge What refers to an ideal body that absorbs all of the radiant energy that intrudes on it and also emits the maximum Which of the following relations is not applicable in the free Which of the following represents the temperature an ideal The work done by a force of R Newtons moving in a distance possible energy – Black Body expansion process - Change in temperature is zero gas will attain when it is brought to rest adiabatically?- of L meters is converted entirely into kinetic energy and Stagnation temperature expressed by the equation:-: RL = 1/2 MV2 What usually happen when a vapor condenses into a liquid Which of the following statements about entropy is false - - Its temperature increases entropy of a crystal at 0 F is zero Which of the following statements is true regarding internal Thermodynamic equilibrium refers to:-: All of the other energy?-: Internal energy is negative for water at a reference choices When a thin bore, hollow glass tube is inserted into a Which of the following statements is not true for real gases? - temperature where enthalpy is zero container of mercury, the surface of the mercury in the tube: Real gases are found only rarely in nature Theoretically air needed for the combustion of one kg of fuel - is below the container surface due to cohesion Which of the following systems strictly follows Boyle's law and is – 14.5 kg Which of the following needs to be filtered in a diesel engine? Charles's law of gases?-: Perfect gas When a system deviates infinitesimally from equilibrium at - Air, diesel oil and lubricating oil Thermal conductivity of wood depends on which of the every instant of its state, it is undergoing: - quasi-static Which of the following is not a unit of pressure?-: kg/m-s following: - All of the other choices process Which of the following relations is not applicable in a free expansion process? - Change in temperature is zero Which of the following cycles consists of two isothermal and To engage, securely and prevent dragging the clearance When a substance in gaseous state is below the critical two constant volume processes?- Stirling cycle between bearing and release collar in a clutch is generally: - temperature, it is called - Vapor Which of the following transfer of heat is involved in the 2-3 mm changing of boiling water( at 100 celsius) to vapor at the Work or energy can be a function of all the following except:- When fuel oil has a high viscosity then the fuel oil - Will flow same temperature? – Convection : Temperature and entropy To measure the clearance between the valve and tappet of slowly through pipes an automobile engine we use a - Feeler gauge Wax is applied on a car body as:-: Any of the other choices The valve in the carburetor of an internal combustion engine When hot soup was served in a cup during dinner an that regulates the proportion of air and gasoline vapors U + pV is a quantity called:-: Enthalpy engineer was so eager to drink it. Since it was hot he - Equal What air pressure is needed for air starting a diesel engine?- entering the cylinder is called:- Choke valve to air’s dew point temperature : 350 psi Under ideal conditions, isothermal, isobaric, isochoric and The instrument used to measure atmospheric pressure is:-: adiabatic processes are: - quasi-static processes When H20 in the products of combustion is in liquid form the What do you call the effectiveness of a body as a thermal Barometer heating value is known as - Higher heating value radiator at a given temperature?-: Emissivity Using the standard sign conventions, what is the proper The specific gravity of a substance is the ratio of its density to arrangement of these terms for the general energy equation When not in use, the self-discharge of an automobile battery What is the SI unit of force?-: Newton the density of:- Water satisfying the first law of - I=-II+III+IV–V in dry weather is generally: - 0.5 to 1% What is the SI unit of pressure?-: Pascal In an Otto engine, the heat is added during:-Isometric Vapor lock is - Complete or partial stoppage of fuel supply When the entire heat exchanger is selected as control process because of vaporization of fuel in supply steam volume, heat becomes - Zero What is the temperature difference of the cycle if the entropy difference is S, and the work done is W?- W/S The ideal cycle based on the concept that the combustion Volumetric efficiency of a well designed engine may be in the When two or more light atoms have sufficient energy process is both diesel and gasoline in the combination of heat range of: - 75 to 90% (available only at high temperature velocities) to fuse together transfer processes that is constant pressure and constant What is true about the polytropic exponent, n, for a perfect – Fusion volume is:- Dual cycle gas undergoing an isobaric process?-n = 0 Wax is applied on card body as: - Any of the other choices When 1 mol carbon combines with 1 mol oxygen - 1 mol What is the absolute temperature in Celsius scale?-: What air pressure is needed of air starting a diesel engine? - carbon dioxide Degrees Kelvin 350 psi Wheel base of a vehicle is the: - Distance between front and What is the ºAPI if the specific gravity at 15.6 ºC is 0.893? What are the units of Reynolds number in pipe flow? - None rear axles [26.98] of the above Which of the following cycles consists of two isothermal and What is the definition of the specific heat at constant volume?- What are the immediate undesirable products from the two constant volume processes? – Stirling : The ratio of the change in internal energy to the change in petroleum based lubricating oil when subjected to high temperature at constant volume pressure and temperature - Gums, resins and acids Which of the following does not belong to the group – Time injection system What is the pressure at the exit of a draft tube in a turbine?- What device is used to measure the amount of infrared atmospheric radiation in each portion of a person’s skin that is emitted? – Which of the following does not belong to the group: - Thermograph Quantity What is the thermal efficiency of a Carnot engine operating between 600 K and 300 K?-: 50% What devices combines air and fuel for burning in cylinder? - Which of the following is a laboratory method for the Carburetor determination of the boiling range of petroleum? – Engler What is the thermodynamic cycle used in the reciprocating distillation engine?-: Otto cycle What do bodies at a temperature above absolute zero emit? - Thermal radiation Which of the following is a petroleum fuel? – Ethyl Alcohol When hot soup was served in a cup during dinner, an engineer was so eager to drink it. Since it was hot, he added What do you call a change of phase directly from vapor to Which of the following is a unit of thermal diffusivity - M2/hr cubes of ice to cool the soup and stirred it. He noticed that solid without passing through the liquid state? – Deposition dew starts to form on the outermost surface of the cup. What Which of the following is the equivalent heat transferred of a is this temperature equal to?-: Equal to air’s dew point What do you call the conversion technology that yields gas undergoing isometric process - Change in internal temperature electricity straight from sunlight without the aid of a working energy substance lik - Photovoltaic-energy conversion When two bodies, isolated from other environments, are in Which of the following is not a gaseous fuel? - Kerosene equilibrium with a third body, the two are in thermal What do you call the first stage of crystal formation? - equilibrium with each other:- Zeroth law of thermodynamics Nucleation