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1) The thermometric property in the Kelvin scale is _______ a. Temperature (T) b. Work energy (W) c. Heat energy (Q) d. all of the above
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2) How is the entropy of a closed system increased? a. by interaction of heat b. by internal irreversibilities c. by dissipative effect in which work is dissipated to increase internal energy of the closed system d. all of the above
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3) The entropy generation a. does not depend upon path followed by a system b. depends upon path followed by a system c. takes place in reversible process d. none of the above
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4) When a process followed by a system is irreversibilities, then what is the entropy generation of the system? a. less than zero b. equals to zero c. greater than zero d. none of the above
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5) Which thermodynamic process cannot be plotted accurately on thermodynamic coordinates? a. reversible process b. irreversible process c. both reversible and irreversible processes d. none of the above
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6) When the potential gradient in a process is infinitesimal or zero, what will be the change in entropy of the universe? a. entropy increases b. entropy decreases c. no change in entropy d. none of the above
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7) What is the result of all the spontaneous processes in nature on the entropy of the universe? a. All the spontaneous processes in nature increases the entropy on the universe b. All the spontaneous processes in nature decreases the entropy on the universe c. All the spontaneous processes in nature do not produce any change in the entropy on the universe d. none of the above
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8) The process which decreases the entropy of the universe is a. reversible process b. irreversible process c. impossible process d. none of the above
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9) Two reversible processes undergone by a closed system between same two end states a. produce different amounts of work b. produce same amount of work if two systems are exchanging energy between themselves c. produce same amount of work if two systems are exchanging energy with the surroundings d. none of the above
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10) How is the Helmholtz functions (F) represented?Where U represents internal energy T represents temperature S represents entropy a. F = U + TS b. F = U – TS c. F = UT – S d. F = UT + S
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11) ow is the Gibbs function (G) represented? Where U represents internal energy T represents temperature S represents entropy a. G = U + pV + TS b. G = U – pV – TS c. G = U + pV – TS d. G = U – pV + TS
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12) If m1 and m2 are the masses of liquid and vapour respectively in a liquid-vapour mixture, then what is the formula for dryness fraction x? a. x = (m1 + m2) / m1 b. x = (m1 + m2) / m2 c. x = m1 / (m1 + m2) d. x = m2 / (m1 + m2)
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13) What is the dryness fraction (x) for saturated water, when water just starts boiling? a. x = 0 b. x = 1 c. x = 0.9 d. x = 0.5
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14) In high pressure condition, the real gases conform more closely with a. van der Waals equation b. ideal gas equation c. both a. and b. d. none of the above
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15) What is reduced property of a substance? a. critical property of a substance minus existing property of the same substance b. existing property of a substance minus critical property of the same substance c. ratio of critical property to existing property of the same substance d. ratio of existing property to critical property of the same substance
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16) The region at which the Joule-Kelvin coefficient is negative is called as a. cooling region b. heating region c. negative region d. positive region
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17) When the thermodynamic criterion of equilibrium (H, S, U, G or F) remains constant for all possible variation of finite magnitude then the system is said to be in a. neutral equilibrium b. unstable equilibrium c. metastable equilibrium d. none of the above
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18) What is the unique feature of regenerative cycle over Rankine cycle? a. the steam leaving the high pressure turbine again heated and used to run low pressure turbine b. the condensate leaving the pump recirculated around the turbine case c. both a. and b. d. none of the above
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19) The net work output of an ideal regenerative cycle is a. more than the net work output of the Rankine cycle b. less than the net work output of the Rankine cycle c. equal to the net work output of the Rankine cycle d. cannot say
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20) Which among the following has the lowest efficiency than the others, when they are operated between same pressures? a. Ideal Rankine cycle b. Ideal regenerative cycle c. Carnot cycle d. None. All of the above have same efficiency
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21) What is the reason behind the fact that the ideal regenerative cycle is practically not possible? a. The reversible heat transfer takes infinite time b. It is mechanically impossible to exchange heat in the turbine c. The moisture content of the steam in the turbine will be high d. all of the above
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22) How are the effect of reheat and effect of regeneration on the efficiency of steam power plant compared? a. effect of reheat is greater that the effect of regeneration on plant efficiency b. effect of regeneration is greater that the effect of reheat on plant efficiency c. both the reheat and regeneration have same effect on efficiency of steam power plant d. cannot say
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23) The feedwater heater in which the extracted steam and feedwater have thermal contact for exchanging heat but the extracted steam is not allowed to mix with the feedwater is called as a. open type feedwater heater b. contact type feedwater heater c. closed type feedwater heater d. none of the above
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24) The feedwater heater in which the extracted steam and feedwater are allowed to mix and both leave the heater at the same temperature, is called as a. open type feedwater heater b. contact type feedwater heater c. both a. and b. d. none of the above
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25) The maximum limit of the pressure ratio of the Brayton cycle for maximum efficiency a. is less than the pressure ratio of the Carnot cycle b. is more than the pressure ratio of the Carnot cycle c. is equal to the pressure ratio of the Carnot cycle d. cannot say
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26) What is a free-shaft turbine? a. the separate turbine which is used only to run compressor b. the separate turbine which is placed on another shaft on which the compressor is not run c. the separate turbine which is used only to run condenser d. all of the above
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27) What is the purpose of using free-shaft turbine? a. to increase net work output of the turbine b. to decrease net work output of the turbine c. to increase part load efficiency d. none of the above
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28) In the gas power plant, the free-shaft turbine is placed a. right before the turbine used for running compressor b. right after the turbine used for running compressor c. right after the heat addition process d. none of the above
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29) Gas turbines are suitable for aircraft propulsion because a. gas turbines are light weight b. gas turbines are compact in size c. gas turbines have a high power-to-weight ratio d. all of the above
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30) Which among the following engines is NOT the type of aircraft gas turbine which works on jet propulsion cycle? a. turbojet b. turbofan c. turboprop d. none of the above
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