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refrigeration and air conditioning MCQs

Practise focused refrigeration and air conditioning questions with marked answers for exam preparation and subject revision.

refrigeration and air conditioning Mcqs
1. In vapour compression cycle, the conditii of refrigerant is saturated liquid________________?
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A. before entering the expansion valve

B. after passing through the expansion throttle valve

C. before entering the compressor

D. after passing through the condenser

E. before passing through the condensei

2. Most of the domestic refrigerators work on the following refrigeration system _________________?
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A. vapour compression

B. electrolux refrigerator

C. dual cycle

D. carnot cycle

E. vapour absorption

3. Allowable pressure on high-pressure side or ammonia absorption system is of the order of_________________?
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A. 2-4 bars

B. 7-10 bars

C. 5-6 bars

D. atmospheric pressure

E. slightly above atmospheric pressure

4. If a heat pump cycle operates between the condenser temperature of +27C and evaporator temperature of 23C, then the Carnot COP will be_________________?
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A. 1.2

B. 6

C. 10

D. 0.2

E. 5

5. Aqua ammonia is used as refrigerant in the following type of refrigeration system_________________?
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A. compression

B. direct

C. absorption

D. none of the above

E. indirect

6. In refrigerator, liquid receiver is required between condenser and flow controlling device, if quantity of refrigerant for system is_____________________?
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A. there is no such consideration

B. pone of the above

C. more than or equal to 3.65 kg

D. less than 2 kg

E. more than 10 kg

7. A refrigerant should have _____________________?
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A. Tow specific heat of liquid

B. low specific volume of vapour

C. k up the wrong statement ?

D. high latent heat of vaporisation

E. higher critical temperature

F. high boiling point
8. One ton refrigeratiqn corresponds to_________________?
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A. 50 kcal/min

B. 80 kcal/min

C. 80 kcal/hr

D. 50 kcal/kr

E. 1000 kcal/day

9. A refrigeration cycle operates between condenser temperature of + 27C and evaporator temperature of- 23C. The Cannot coefficient of performance of cycle will be_________________?
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A. 6

B. 5

C. 0.2

D. 10

E. 1.2

10. Critical temperature is the temperature above which _____________________?
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A. none of the above

B. water will evaporate

C. a gas will immediately liquefy

D. water will never evaporate

E. a gas will never liquefy
11. The COP of a domestic refrigerator___________________?
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A. is equal to 1

B. depends upon the make

C. is less than 1

D. is more than 1

E. depends upon the weather conditions

12. The refrigeration effect in a dry evaporator compared to flooded evaporator in a similar plant is_________________?
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A. unpredictable

B. same

C. more or less depending on ambient conditions

D. more

E. less
13. The evolution of heat of solution takes place in ammonia absorption plant when _____________________?
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A. lithium bromide is driven out of solution

B. lithium bromide mixes with ammonia

C. ammonia vapour goes into solution

D. ammonia vapour is driven out of solution

E. weak solution mixes with strong solution

14. Vertical lines on pressure-enthalpy chart show constant_______________?
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A. pressure lines

B. volume lines

C. total heat lines

D. temperature lines

E. entropy lines

15. The C.O.P of a refrigeration cycle with increase in evaporator temperature, keeping condenser temperature constant, will______________________?
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A. increase

B. unpredictable

C. remain unaffected

D. may increase or decrease depending on the type of refrigerant used

E. decrease

16. Clapeyron equation is applicable for registration at___________________?
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A. saturation point of vapor

B. saturation point of liquid

C. critical point

D. sublimation temperature

E. triple point

17. Presence of moisture in a refrigerant affects the working of___________________?
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A. expansion valve

B. heat transfer

C. evaparator

D. compressor

E. condenser

18. For obtaining high COP, the pressure range of compressor should be_______________?
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A. low

B. high

C. any value

D. there is no such criterion

E. optimum

19. In vapor compression cycle, the condition of refrigerant is very wet vapor________________?
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A. before entering the expansion valve

B. after passing through the condenser

C. before entering the compressor

D. before passing through the condenser

E. after passing through the expansion or throttle valve

20. The bank of tubes at the back of domestic refrigerator are _________________?
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A. condenser tubes

B. refrigerant cooling tubes

C. capillary tubes

D. evaporator tubes

E. throttling device