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MCQs 1: What is the difference between the Brayton cycle and the Rankine cycle?

Brayton cycle has two reversible isobars whereas Rankine cycle has two isotherms The working fluid of Brayton cycle always remains in gaseous phase whereas in Rankine cycle the working fluid undergoes phase change Brayton cycle operates between higher pressure ratio than the Rankine cycle for same capacity all of the above
Answer Explanation

MCQs 2: As the evaporator temperature lowers down, the required compression ratio

becomes lower for a given condensation temperature becomes higher for a given condensation temperature becomes steady for a given condensation temperature cannot say
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MCQs 3: What is the use of multistage compression in vapour compression refrigeration system?

to increase volumetric efficiency of compressor to allow the system to operate between higher pressures to reduce risk of damage to refrigerant all of the above
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MCQs 4: What is used as an intercooler in multistage compression of vapour compression refrigeration system?

water air refrigerant itself none of the above
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MCQs 5: When two refrigerating cycles are used in series with two different refrigerants, the system is known as

dual refrigeration system cascade refrigeration system vapour absorption refrigeration system none of the above
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MCQs 6: What is the desirable characteristic of a refrigerant?

it should not be toxic it should not be non-corrosive it should have minimum enthalpy of vaporization all of the above
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MCQs 7: Which refrigerant is widely used in refrigeration facilities of food as cooling of fresh vegetables, dairy products, meat and fish and similar process industries?

sulphur dioxide ethyl chloride propane ammonia
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MCQs 8: When dry bulb temperature (DBT) and wet bulb temperature (WBT) are measured, greater the difference between DBT and WBT,

greater the amount of water vapour held in the mixture smaller the amount of water vapour held in the mixture same the amount of water vapour held in the mixture none of the above
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MCQs 9: What is sensible cooling of air?

the cooling in which sensible heat of air is removed in order to reduce temperature the cooling in which temperature of air is reduced without changing in its moisture content both a. and b. none of the above
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MCQs 10: When the humidity ratio of air increases the air is said to be

dehumidified humidified heated cooled
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MCQs 11: How is the natural draught produced for exhaust gases?

by using fan by using chimney by using gravity none of the above
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MCQs 12: Macroscopic thermodynamics ______

is concerned with the effects of action of many molecules in matter results can be derived from microscopic study of matter is not concerned with the events occurring at the molecular level all of the above
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MCQs 13: Which among the following systems undergo/es work transfer?

Current flowing through the resistor A shaft rotated by a motor both a. and b. none of the above
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MCQs 14: Which of the following is/are mode/s of storage of internal energy in a system?

Macroscopic energy mode Microscopic energy mode both a. and b. none of the above
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MCQs 15: A process of application of breaks in a vehicle is

a reversible process an irreversible process a quasi-static process none of the above
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MCQs 16: A process becomes reversible when

it undergoes in the absence of any dissipative effect all the points through the path are at thermodynamic equilibrium it undergoes as a very slow quasi-static process all of the above
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MCQs 17: Carnot cycle is

a reversible cycle an irreversible cycle practical cycle none of the above
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MCQs 18: Which of the following is a reversed heat engine?

Heat pump Refrigerator both a. and b. none of the above
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MCQs 19: According to the Carnot's theorem, the efficiency of a reversible heat engine operating between a same given constant temperature source and a given constant temperature sink is

higher than any other irreversible heat engine less than any other irreversible heat engine equal to any other irreversible heat engine none of the above
Answer Explanation

MCQs 20: If a reversible heat engine A is operating between the temperature levels T1 and T2 and another reversible heat engine B of different capacity is also operating between the same temperature difference T1 and T2, then the efficiency of reversible heat engine B is

greater than efficiency of the reversible heat engine A less than the efficiency of the reversible heat engine A equal to the efficiency of the reversible heat engine A cannot say
Answer Explanation

MCQs 21: An electric current I is passing through a resistor in contact with a reservoir. The internal energy of the resistor is constant. Heat generated is absorbed by surrounding at temperature T0. What will be the effect on entropy of the universe?

Entropy of the universe is always constant The process increases the the entropy of the universe The process decreases the the entropy of the universe cannot say
Answer Explanation

MCQs 22: How is heat transfer associated with entropy transfer?

the entropy transfer takes places along with heat flow in the direction of heat transfer the entropy transfer takes places along with heat flow in the opposite direction of heat transfer the entropy transfer does not take place along with heat transfer none of the above
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MCQs 23: What is the entropy transfer associated with work?

positive entropy transfer negative entropy transfer no entropy transfer all of the above
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MCQs 24: When system gains entropy from the surrounding, what will be the effect on the molecules of the system?

molecular disorder increases molecular disorder decreases no change on molecular system none of the above
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MCQs 25: What is the entropy generation?

increase in the entropy of a system due to internal irreversibility decrease in the entropy of a system due to internal irreversibility no change in entropy of a system none of the above
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MCQs 26: Which law of thermodynamics expresses that the energy is always conserved quantity wise?

First law Second law Third law none of the above
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MCQs 27: The law of degradation of energy states that

the energy is always conserved quantity wise the energy is always conserved quality wise the energy is always degraded quantity wise the energy is always degraded quality wise
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MCQs 28: The temperature of a substance at which the vapour pressure is equal to 760 mm Hg is called as

normal vapour point normal boiling point normal pressure point none of the above
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MCQs 29: The temperature at which a pure liquid transforms into vapour at constant pressure is called as

vaporisation temperature normal temperature saturation temperature none of the above
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MCQs 30: In which condition can real gas closely obey the ideal gas equation?

pressure is very small and temperature is very high pressure is very high and temperature is very low both pressure and temperature are very high both pressure and temperature are very low
Answer Explanation

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