1) The below diagram is the T-s diagram of the Rankine cycle with reheat.
Which process represents the reheat?
a. process 1 – 2
b. process 2 – 2 ′
c. process 2 ′ – 2 ″
d. process 2 – 3 ′
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Answer
Explanation
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ANSWER: process 2 ′ – 2 ″
Explanation:
No explanation is available for this question!
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2) What is the importance of the freezing point of the working fluid in 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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Answer
Explanation
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ANSWER: freezing point of working fluid should be below the room temperature
Explanation:
No explanation is available for this question!
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3) What is the relation between brake efficiency, internal efficiency and mechanical efficiency?
a. η Internal = η Mech * η Brake
b. η Mech = η Internal * η Brake
c. η Brake = η Internal * η Mech
d. none of the above
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Answer
Explanation
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ANSWER: ηBrake = ηInternal * ηMech
Explanation:
No explanation is available for this question!
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4) What is the correct formula for brake efficiency of the turbine in vapour power cycle?
Where out flow is as following,Ideal output(Actual work given to turbine) ----> Internal losses ----> Internal output (Actual work produced by turbine turbine) ----> External losses -----> Brake output (Actual work at the shaft)
a. η Brake = Brake output / Ideal output
b. η Brake = Brake output / Internal output
c. η Brake = Ideal output / Brake output
d. η Brake = Internal output / Brake output
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Answer
Explanation
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ANSWER: ηBrake = Brake output / Ideal output
Explanation:
No explanation is available for this question!
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5) In binary vapour cycle, the cycle which is operated in high pressure ratio is called as
a. bottoming cycle
b. topping cycle
c. upper cycle
d. pressure cycle
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Answer
Explanation
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ANSWER: topping cycle
Explanation:
No explanation is available for this question!
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6) When two vapor cycles are coupled in series and heat rejected by one is absorbed by another, the cycle is called as
a. Dual vapour cycle
b. Binary vapour cycle
c. Coupled vapour cycle
d. none of the above
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Answer
Explanation
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ANSWER: Binary vapour cycle
Explanation:
No explanation is available for this question!
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7) 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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Answer
Explanation
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ANSWER: should be small
Explanation:
No explanation is available for this question!
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8) What should be the critical temperature of working fluid for maximum efficiency of vapour power cycle?
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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Answer
Explanation
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ANSWER: the working fluid should have critical temperature as high as possible
Explanation:
No explanation is available for this question!
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9) 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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Answer
Explanation
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ANSWER: the vacuum in the condenser increases
Explanation:
No explanation is available for this question!
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10) What 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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Answer
Explanation
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ANSWER: all of the above
Explanation:
No explanation is available for this question!
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