Question 21 : It is advantageous to use a Combustion chamber plant with maximum supplementary firing than Combustion Chamber installations.
1. True
2. False
3.
4.
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Question 22 : Efficiency of Natural gas fired Combined cycle plants is more than that of coal-fired plants.
1. true
2. false
3.
4.
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Question 23 : Exergic __________ is a measure of the perfectness of a thermal system.
1. enthalpy
2. efficiency
3. strength
4. degree
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Question 24 : Choice of a gas turbine depends most on which of these factors?
1. Compression ratio
2. Cut-off ratio
3. Pressure ratio
4. none of the mentioned
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Question 25 : Which among these plants are most efficient?
1. Open cycle
2. Combined cycle
3. Closed cycle
4. Either (a) or (c)
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Question 26 : If p and q are the efficiencies of a Brayton & Rankine cycles respectively in a Brayton-Rankine combined plant, the efficiency n of a combined plant is?
1. n = p/q
2. n = p+q-pq
3. n = pq
4. n = (1 - pq)
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Question 27 : Which material is used for the manufacture of the turbine blades?
1. Stainless steel
2. Carbon steel
3. High nickel alloy
4. High alloy steel
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Question 28 : Which of these is a working fluid in the topping plant of a Brayton-Rankine combined plant?
1. Hydrogen
2. Helium
3. Nitrogen
4. All of the mentioned
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Question 29 : The maximum work attainable as the system comes in equilibrium with surrounding is called?
1. Energy
2. Availability
3. Exergy
4. Entropy
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Question 30 : With an increase in the combined cycle pressure ratio, the efficiency of the bottoming cycle?
1. increases
2. decreases
3. remains same
4. none of the mentioned
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