# Thermodynamics Questions and Answers – Heat Pump System

This set of Thermodynamics Multiple Choice Questions & Answers (MCQs) focuses on “Heat Pump System”.

1. A heat pump,
a) extracts energy at low temperature heat source
b) gives energy to high temperature heat source
c) both of the mentioned
d) none of the mentioned

Explanation: This is the functioning of a heat pump.

2. Which of the following is true for a heat pump and a refrigerator?
a) a refrigerator removes heat to achieve cooling
b) a heat pump supplies heat at high temperature
c) both of the mentioned
d) none of the mentioned

Explanation: This is also the main difference between a heat pump and a refrigerator.

3. A vapour compression heat pump has
a) compressor
b) evaporator
c) condenser
d) all of the mentioned

Explanation: These are similar to the components of vapour compression refrigeration cycle.

4. Which of the following can be used to transfer heat to the refrigerant passing through evaporator?
a) outside air
b) water from rivers
c) the ground
d) all of the mentioned

Explanation: These are the possible heat sources.

5. An air-air heat pump can be used for
a) heating during winter
b) cooling during summer
c) both of the mentioned
d) none of the mentioned

Explanation: This can be achieved using a reversing valve.
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6. The ideal gas refrigeration cycle is same as
a) the Brayton cycle
b) reversed Brayton cycle
c) the Rankine cycle
d) reversed Rankine cycle

Explanation: Both these cycles consists of same processes.

7. The condenser and evaporator in vapour compression system are called cooler and refrigerator respectively.
a) true
b) false

Explanation: It is because there is no phase change.

8. The COP of refrigeration cycle is given by
a) 1 / {(p1/p2)^ɣ/(ɣ-1)]} – 1
b) 1 / {(p1/p2)^(ɣ-1)/ɣ]} – 1
c) 1 / {(p1/p2)^(ɣ-1)/ɣ]} + 1
d) none of the mentioned

Explanation: Here p1 is the pressure after compression and p2 is the pressure before compression.

9. The COP of gas-cycle refrigeration cycle is very high.
a) true
b) false

Explanation: The COP of gas-cycle refrigeration cycle is low.

10. A gas-cycle refrigeration system is used in
a) aircrafts
b) missiles
c) both of the mentioned
d) none of the mentioned

Explanation: This is because the vapour compression refrigeration system in this case becomes bulky and heavy.

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