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MCQs 1: What is the dryness fraction (x) on saturated vapour line?

x = 0 x = 1 x = 0.9 x = 0.5
Answer Explanation

MCQs 2: In a mixture of ideal gases of volume V and temperature T, what is the pressure exerted by each individual gas if it occupies the total volume V alone at temperature T called?

individual pressure divided pressure partial pressure total pressure
Answer Explanation

MCQs 3: What is the entropy change when the system is at stable equilibrium state?

the entropy change will be positive the entropy change will be negative the entropy change will be zero cannot say
Answer Explanation

MCQs 4: What is the entropy of the system at equilibrium state?

zero minimum maximum constant but not maximum
Answer Explanation

MCQs 5: As the heat rejection temperature decreases in the vapour power cycle below atmospheric pressure,

the vacuum in the condenser also decreases the vacuum in the condenser increases it does not produce any vacuum in condenser none of the above
Answer Explanation

MCQs 6: What should be the critical temperature of working fluid for maximum efficiency of vapour power cycle?

the working fluid should have critical temperature as low as possible the working fluid should have critical temperature as high as possible the critical temperature does not affect the efficiency of the vapour power cycle none of the above
Answer Explanation

MCQs 7: The specific heat of the ideal working fluid used in vapor power cycle

should be constant should be large should be small none of the above
Answer Explanation

MCQs 8: The specific heat of the ideal working fluid used in vapor power cycle

should be constant should be large should be small none of the above
Answer Explanation

MCQs 9: What is the importance of the freezing point of the working fluid in the vapour power cycle?

freezing point of working fluid should be below the room temperature freezing point of working fluid should be above the room temperature freezing point of working fluid should be equal to the room temperature does not have any importance
Answer Explanation

MCQs 10: When two vapor cycles are coupled in series and heat rejected by one is absorbed by another, the cycle is called as

Dual vapour cycle Binary vapour cycle Coupled vapour cycle none of the above
Answer Explanation

MCQs 11: In working condition of turbojet engine, velocity of air entering the engine is

higher than the velocity of exhaust gases leaving the engine lower than the velocity of exhaust gases leaving the engine equal to the velocity of exhaust gases leaving the engine cannot say
Answer Explanation

MCQs 12: Why do the airplanes fly at higher altitude during the long flights?

to avoid collisions as they are at very high speed and controlling will be difficult if something (like towers, hills) comes in the way it is easy to communicate with satellites at high altitudes to save the fuel as air at higher altitude exerts smaller drag force on aircraft none of the above
Answer Explanation

MCQs 13: The propulsive efficiency is the ratio of

the propulsive power to the energy input rate the exit velocity rate of exhaust gases to the energy input rate the work done by the turbine to the energy input rate velocity of aircraft to the energy input rate
Answer Explanation

MCQs 14: In turbofan engine, fan is used

to compress the inlet air more efficiently to increase the total thrust of the engine both a. and b. none of the above
Answer Explanation

MCQs 15: In turbofan engine, the bypass ratio is the ratio of

total mass flow rate of exhaust stream to the mass flow rate of stream from turbine exhaust total mass flow rate of exhaust stream to the mass flow rate of stream from fan exhaust the mass flow rate of stream from turbine exhaust to the mass flow rate of stream from fan exhaust the mass flow rate of stream from fan exhaust to the mass flow rate of stream from turbine exhaust
Answer Explanation

MCQs 16: What is the effect of increasing bypass ratio of a turbofan engine on its thrust?

thrust increases with increase in bypass ratio of turbofan engine thrust decreases with increase in bypass ratio of turbofan engine thrust of the turbofan engine only depends upon the fuel rate, so no change of thrust with increase in bypass ratio cannot say
Answer Explanation

MCQs 17: Heat pump is used

to transform low grade rejected heat into high temperature heat source to transform high grade rejected heat into low temperature heat sink both a. and b. none of the above
Answer Explanation

MCQs 18: What is the effect of increasing bypass ratio of a turbofan engine on its thrust?

thrust increases with increase in bypass ratio of turbofan engine thrust decreases with increase in bypass ratio of turbofan engine thrust of the turbofan engine only depends upon the fuel rate, so no change of thrust with increase in bypass ratio cannot say
Answer Explanation

MCQs 19: Which of the following is NOT a type of heat pump?

vapour compression type vapour absorption type both a. and b. none of the above
Answer Explanation

MCQs 20: Which of the following is NOT a type of heat pump?

vapour compression type vapour absorption type both a. and b. none of the above
Answer Explanation

MCQs 21: In year-round air conditioning, by reversing refrigerating cycle

condenser acts like evaporator evaporator acts like condenser both a. and b. none of the above
Answer Explanation

MCQs 22: In gas cycle refrigeration system, the throttle valve of a vapour compression refrigerant system is replaced by

capillary tube expander reverse throttle valve none of the above
Answer Explanation

MCQs 23: How much is the temperature drop of real gas by throttling?

vary big temperature drop very small temperature drop no temperature drop cannot say
Answer Explanation

MCQs 24: The ideal gas-refrigeration cycle is similar to

Brayton cycle Reversed Brayton cycle Rankine cycle Reversed Rankine cycle
Answer Explanation

MCQs 25: The horizontal line in psychrometric chart joining the change of state of air represents

humidification sensible cooling or heating sensible cooling or heating with humidification sensible cooling or heating with dehumidification
Answer Explanation

MCQs 26: Air at dry bulb temperature Td1 is passed through the heating coil and some amount of air is by passed unaffected and leaves with dry bulb temperature Tb2 and the temperature of heated air is Td3 (where Td2 < Td3), what is the correct formula for by pass factor (The amount of air by passed unaffected)?

Bypass Factor = (Td3 – Td2) / (Td3 – Td1) Bypass Factor = (Td3 – Td1) / (Td3 – Td2) Bypass Factor = (Td2 – Td1) / (Td2 – Td3) Bypass Factor = (Td2 – Td3) / (Td2 – Td1)
Answer Explanation

MCQs 27: Humidification is the process of addition moisture in air at

constant wet bulb temperature constant dry bulb temperature constant latent heatn none of the above
Answer Explanation

MCQs 28: Which device used to separate condensate from the steam without letting steam escape?

condenser steam valve steam trap none of the above
Answer Explanation

MCQs 29: The substance which is homogeneous and invariable in chemical composition throughout its mass is called as ____.

ideal substance pure substance solid substance none of the above
Answer Explanation

MCQs 30: The two-property rule statement consists that ____.

to fix state of pure substance of a given mass, the system should be in equilibrium to fix state of pure substance of a given mass, any two independent intensive properties of the substance should be specified both a. and b. conditions should be satisfied none of the above
Answer Explanation

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