Steam and Gas Turbines Multiple Choice Questions on “Combined effect of intercooling, reheating and regeneration”.
1. Regenerator is also called as ___________
a) Intercooler
b) Reheater
c) Recuperator
d) None of the mentioned
Answer: c
Clarification: Regenerator is also called as a recuperator.
2. When recuperator is used thermal efficiency is ______
a) decreased
b) increased
c) doesn’t change
d) none of the mentioned
Answer: b
Clarification: When regenerator is used thermal efficiency is increased.
3. Inlet temperature of regenerator is __________
a) same as of the inlet exhausted gases
b) more than the inlet exhausted gases
c) less than the inlet exhaust gases
d) none of the mentioned
Answer: a
Clarification: Inlet temperature of regenerator is same as of inlet exhaust gases.
4. Effectiveness can be defined as _________
a) decrease in exhausted gases
b) inverse of the efficiency
c) ratio of heat rate to the mass entering
d) ratio of Actual heat transferred to the maximum heat transferred
Answer: d
Clarification: Effectiveness is the ratio of actual heat transferred to maximum heat that can be transferred.
5. Generally effectiveness of regenerators are ___________
a) 0.95
b) 0.66
c) 0.77
d) 0.85
Answer: d
Clarification: Generally effectiveness is 0.85 for a regenerator.
6. Compression can be taken place by _____________
a) isoentropic compression
b) isothermal compresion
c) two stage compression process
d) all of the mentioned
Answer: d
Clarification: Compression can be taken place by isoentropic compression or isothermal compression or by two stage compression.
7. Isoentropic compression requires maximum work.
a) True
b) False
Answer: a
Clarification: Isoentropic compression requires maximum work.
8. Isothermal compression requires minimum work.
a) True
b) False
Answer: a
Clarification: Isothermal compression requires minimum work.
9. By two stage compression work output from turbine is _______
a) decreased
b) increased
c) remains constant
d) none
Answer: b
Clarification: Two stage compression increases work output from turbine.
10. When equal pressure ratio are maintained at two stages the work output _______
a) increases
b) decreases
c) optimum
d) none of the mentioned
Answer: a
Clarification: When equal pressure ratio is maintained work output increases.