Multiple Choice Questions with Answers on Refrigeration and Air-Conditioning - Set 07

Practice Test: Question Set - 07

1. Freon group of refrigerants are
    (A) Inflammable
    (B) Toxic
    (C) Non-inflammable and toxic
    (D) Nontoxic and non-inflammable

2. The boiling point of ammonia is
    (A) -10.5°C
    (B) -30°C
    (C) -33.3°C
    (D) -77.7°C

3. For obtaining high COP, the pressure range of compressor should be
    (A) High
    (B) Low
    (C) Optimum
    (D) Any value

4. A reversible engine has ideal thermal efficiency of 30%. When it is used as a refrigerating machine with all other conditions unchanged, the coefficient of performance will be
    (A) 1.33
    (B) 2.33
    (C) 3.33
    (D) 4.33

5. Cooling water is required for following equipment in ammonia absorption plant
    (A) Condenser
    (B) Evaporator
    (C) Absorber
    (D) Condenser, absorber and separator (rectifier)

6. The freezing point of sulphur dioxide is
    (A) -56.6°C
    (B) -75.2°C
    (C) -77.7°C
    (D) -135.8°C

7. Mass flow ratio of NH₃ in comparison to Freon-12 for same refrigeration load and same temperature limits is of the order of
    (A) 1: 1
    (B) 1: 9
    (C) 9: 1
    (D) 1: 3

8. In a refrigeration system, the expansion device is connected between the
    (A) Compressor and condenser
    (B) Condenser and receiver
    (C) Receiver and evaporator
    (D) Evaporator and compressor

9. The vapour compression refrigerator employs the following cycle
    (A) Rankine
    (B) Carnot
    (C) Reversed Rankine
    (D) Reversed Carnot

10. In actual air-conditioning applications for R-12 and R-22, and operating at a condenser temperature of 40° C and an evaporator temperature of 5° C, the heat rejection factor is about
    (A) 1
    (B) 1.25
    (C) 2.15
    (D) 5.12

11. Rating of a domestic refrigerator is of the order of
    (A) 0.1 ton
    (B) 5 tons
    (C) 10 tons
    (D) 40 tons

12. A human body feels comfortable when the heat produced by the metabolism of human body is equal to the
    (A) Heat dissipated to the surroundings
    (B) Heat stored in the human body
    (C) Sum of (A) and (B)
    (D) Difference of (A) and (B)

13. The bank of tubes at the back of domestic refrigerator is
    (A) Condenser tubes
    (B) Evaporator tubes
    (C) Refrigerant cooling tubes
    (D) Capillary tubes

14. In a lithium bromide absorption refrigeration system
    (A) Lithium bromide is used as a refrigerant and water as an absorbent
    (B) Water is used as a refrigerant and lithium bromide as an absorbent
    (C) Ammonia is used as a refrigerant and lithium bromide as an absorbent
    (D) None of the above

15. The condition of refrigerant after passing through the condenser in a vapour compression system is
    (A) Saturated liquid
    (B) Wet vapour
    (C) Dry saturated vapour
    (D) Superheated vapour

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  1. This is a good test for installers air conditioners. I've already tried it. I called the master, that he had set air conditioning. When he has mounted, I began to ask him these questions. You will not believe, but they answered 13 questions correctly. After that, it became clear that they really can trust. I advise everyone check their contractors. Good luck.