250+ TOP MCQs on Coupled Cycles and Answers

Power Plant Engineering Multiple Choice Questions on “Coupled Cycles”.

1. The mercury steam cycle represents how many coupled Rankine cycles?
a) 1
b) 2
c) 3
d) 4
Answer: b
Clarification: The mercury steam cycle represents 2 fluid cycles where 2 Rankine cycles have been coupled in series.

2. In the mercury steam cycle, the mercury cycle is called?
a) bottoming cycle
b) middle cycle
c) topping cycle
d) none of the mentioned
Answer: c
Clarification: The mercury steam cycle has the mercury cycle as the topping cycle.

3. In the mercury steam cycle, the steam cycle is called?
a) bottoming cycle
b) middle cycle
c) topping cycle
d) none of the mentioned
Answer: a
Clarification: The mercury steam cycle has the steam cycle as the bottoming cycle.

4. Apart from mercury & steam, which of these is a component of tertiary cycle?
a) nitrogen di-oxide
b) water
c) carbon di-oxide
d) sulphur di-oxide
Answer: d
Clarification: The tertiary cycle is mercury-steam-sulphur dioxide cycle.

5. The addition of sulphur dioxide in a tertiary cycle is at?
a) high temperature
b) low temperature
c) too high temperature
d) none of the mentioned
Answer: b
Clarification: The tertiary cycle is mercury-steam-sulphur dioxide cycle. Here, addition of sulphur dioxide is at low temperature.

6. Which of these can also be used as a topping fluid?
a) Sodium
b) Calcium
c) Boron
d) Titanium
Answer: a
Clarification: Apart from mercury, only Sodium or Potassium are suitable enough to be used as a topping fluid.

7. Which of these can be used as a fluid in the bottoming fluid?
a) Mercury
b) Ammonia
c) Calcium
d) Sodium
Answer: b
Clarification: Apart from Sulphur dioxide, Ammonia is the most suitable bottoming fluid.

8. In case of Sodium-mercury-steam cycle, which is the topping fluid?
a) Mercury
b) Steam
c) Sodium
d) Cannot say
Answer: c
Clarification: Apart from mercury, only Sodium or Potassium are suitable enough to be used as a topping fluid. Here, mercury is not a topping fluid so naturally, sodium becomes the topping fluid.

9. In case of mercury-steam-sulphur dioxide cycle, which is the bottoming fluid?
a) Mercury
b) Steam
c) Sulphur dioxide
d) Cannot say
Answer: c
Clarification: Sulphur dioxide, being the only bottoming fluid in the tertiary cycle is used as a bottoming fluid.

10. The total loss in a tertiary cycle is?
a) sum of losses in the individual cycles
b) product of losses in the individual cycles
c) sum of products of individual losses
d) none of the mentioned
Answer: b
Clarification: The total loss in a tertiary cycle is product of losses in the individual cycles.