Ideal Working Fluid in Vapour Power Cycles - MCQs with Answers

Ideal Working Fluid in Vapour Power Cycles - MCQs with Answers

Q1. Which is the drawback of the steam as a working substance in a power cycle?

a. in a vapour power cycle, maximum temperature which can be obtained with best available material is more than the critical temperature of water and requires large superheating
b. it allows only small amount of heat addition at the highest temperature
c. it requires reheat and reheater tubes are costly
d. all of the above

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Q2. As the heat rejection temperature decreases in the vapour power cycle below atmospheric pressure,

a. the vacuum in the condenser also decreases
b. the vacuum in the condenser increases
c. it does not produce any vacuum in condenser
d. none of the above

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Q3. For maximum efficiency of vapour power cycle, what should be the critical temperature of working fluid?

a. the working fluid should have critical temperature as low as possible
b. the working fluid should have critical temperature as high as possible
c. the critical temperature does not affect the efficiency of the vapour power cycle
d. none of the above

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Q4. The specific heat of the ideal working fluid used in vapor power cycle

a. should be constant
b. should be large
c. should be small
d. none of the above

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Q5. What is the importance of the freezing point of the working fluid in the the vapour power cycle?

a. freezing point of working fluid should be below the room temperature
b. freezing point of working fluid should be above the room temperature
c. freezing point of working fluid should be equal to the room temperature
d. does not have any importance

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