Question 21 : Regenerative heating i.e., bleeding steam to reheat feed water to boiler
1. decreases thermal efficiency of the cycle
2. increases thermal efficiency of the cycle
3. does not affect thermal efficiency of the cycle
4. may increase or decrease thermal efficiency of the cycle depending upon the point of extraction of steam
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Question 22 : In a regenerative feed heating cycle, the optimum value of the fraction of steam extracted for feed heating
1. decreases with increase in Rankine cycle efficiency
2. increases with increase in Rankine cycle efficiency
3. is unaffected by increase in Rankine cycle efficiency
4. none of the mentioned
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Question 23 : In case of Sodium-mercury-steam cycle, which is the topping fluid?
1. Mercury
2. Steam
3. Sodium
4. Cannot say
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Question 24 : The heating value of gaseous fuels is about
1. 500 kJ/litre
2. 30 kJ/litre
3. 100 kJ/litre
4. 10 kJ/litre
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Question 25 : In the _____ heat transfer takes place between the exhaust gases and cool air.
1. Intercooler
2. Re-heater
3. Regenerator
4. Compressor
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Question 26 : By superposing a high temperature power plant as a topping unit to the steam plant, the energy conversion efficiency achieved is?
1. higher
2. lower
3. maximum
4. minimum
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Question 27 : In gas turbine, intercooler is placed
1. before low pressure compressor
2. in between low pressure compressor and high pressure compressor
3. in between high pressure compressor and turbine
4. None of the mentioned
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Question 28 : The thermionic generator is essentially which kind of device?
1. low voltage & high current
2. high voltage & high current
3. low voltage & low current
4. high voltage and high current
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Question 29 : Which of these can also be used as a topping fluid?
1. Sodium
2. Calcium
3. Boron
4. Titanium
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Question 30 : The mercury steam cycle represents how many coupled Rankine cycles?
1. 1
2. 2
3. 3
4. 4
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