Question 51 : The use of which of the following becomes necessary during expansion of steam?
1. reheat
2. regeneration
3. refrigeration
4. superheat
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Question 52 : The efficiency of multistage compressor is _____ than a single stage.
1. lower
2. higher
3. equal to
4. any of the mentioned
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Question 53 : What is the air standard cycle for a Gas-Turbine called?
1. Reheat cycle
2. Rankine cycle
3. Brayton cycle
4. Diesel cycle
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Question 54 : When two vapour cycles are coupled in series and heat rejected by one is absorbed by another, the cycle is called as?
1. Dual vapour cycle
2. Binary vapour cycle
3. Coupled vapour cycle
4. None of the mentioned
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Question 55 : The engines which are operating on gas power cycle are?
1. cyclic
2. non-cyclic
3. either cyclic or non-cyclic
4. none of the mentioned
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Question 56 : In the mercury steam cycle, the mercury cycle is called?
1. bottoming cycle
2. middle cycle
3. topping cycle
4. none of the mentioned
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Question 57 : What is the condition for increasing the chances of corrosion of blades of turbine?
1. decrease in the pressure difference between which the Rankine cycle operates
2. increase in the pressure difference between which the Rankine cycle operates
3. both a and b
4. none of the mentioned
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Question 58 : A Gas Turbine is which type of combustion plant?
1. external
2. open
3. internal
4. cannot say
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Question 59 : When the pressure at which heat is added in Rankine cycle increases, the moisture content at the turbine exhaust
1. increases
2. decreases
3. remains same
4. cannot say
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Question 60 : Which is the drawback of the steam as a working substance in a power cycle?
1. 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
2. it allows only small amount of heat addition at the highest temperature
3. it requires reheat and reheater tubes are costly
4. all of the mentioned
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