Vapour Compression Refrigeration Cycle - MCQs with Answers

Vapour Compression Refrigeration Cycle - MCQs with Answers

Q1. Which device is used for the expansion of refrigerant in vapour compression refrigeration cycle?

a. throttling valve
b. capillary tube
c. either throttling valve or capillary tube
d. none of the above

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Q2. Wet compression is ______.

a. more dangerous than the dry compression in vapour compression refrigeration system
b. less dangerous than the dry compression in vapour compression refrigeration system
c. equally preferable in vapour compression refrigeration system
d. cannot say

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Q3. How is the condensation process in vapour compression refrigeration cycle carried out?

a. at constant volume
b. at constant pressure
c. at constant enthalpy
d. all of the above

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Q4. What is flash gas fraction?

a. the mass fraction of liquid in liquid-vapour mixture of refrigerant at inlet to the evaporator

b. the mass fraction of vapour in liquid-vapour mixture of refrigerant at inlet to the evaporator

c. the mass of vapour actually compressed to the mass of vapour should have compressed ideally

d. none of the above

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Q5. In evaporation process of vapour compression refrigeration system

a. heat is rejected from refrigerant to surroundings
b. heat is rejected from surroundings to refrigerant
c. only pressure change takes place
d. none of the above

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Q6. The heat required to melt 1 tonne of ice in 12 hours is equivalent to

a. one tonne of refrigeration
b. two tonne of refrigeration
c. half tonne of refrigeration
d. four tonne of refrigeration

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Q7. One tonne of refrigeration is approximately equal to

a. 3.5 kJ / min
b. 3.5 W
c. 211 kW
d. 211 kJ / min

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Q8. What is the main reason behind subcooling of liquid refrigerant at the condenser outlet in vapour compression refrigeration system?

a. to increase the refrigerating effect
b. to reduce the mass of vapour formed during expansion process
c. to reduce vapour bubbles which obstruct the flow of liquid refrigerant
d. all of the above

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Q9. What is the result of superheating of vapour at the evaporator outlet?

a. no liquid droplets will travel to the compressor
b. the compressor discharge temperature increases
c. both a. and b.
d. none of the above

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Q10. Which expansion device is capable of regulating the flow of refrigerant according to the load on the evaporator?

a. capillary tube
b. throttle valve
c. both a. and b.
d. none of the above
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Q11. Which compressor is used, when volume flow rate of refrigerant is very large?

a. rotary compressor
b. reciprocating compressor
c. centrifugal compressor
d. none of the above

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Q12. As the evaporator temperature lowers down, the required compression ratio

a. becomes lower for a given condensation temperature
b. becomes higher for a given condensation temperature
c. becomes steady for a given condensation temperature
d. cannot say

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Q13. What is the use of multistage compression in vapour compression refrigeration system?

a. to increase volumetric efficiency of of compressor
b. to allow the system to operate between higher pressures
c. to reduce risk of damage to refrigerant
d. all of the above

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Q14. What is used as an intercooler in multistage compression of vapour compression refrigeration system?

a. water
b. air
c. refrigerant itself
d. none of the above

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