Refrigeration & Air-Conditioning Objective Questions With Answers - Set 01 - ObjectiveBooks

Refrigeration & Air-Conditioning Objective Questions With Answers - Set 01

Practice Test: Question Set - 01

1. In a refrigeration cycle, the flow of refrigerant is controlled by
    (A) Compressor
    (B) Condenser
    (C) Evaporator
    (D) Expansion valve

2. The colour of the flame of halide torch, in case of leakage of Freon refrigerant, will change to
    (A) Bright green
    (B) Yellow
    (C) Red
    (D) Orange

3. For air conditioning the operation theater in a hospital, the percentage of outside air in the air supplied is
    (A) Zero
    (B) 20
    (C) 50
    (D) 100

4. In vapour compression cycle using NH₃ as refrigerant, initial charge is filled at
    (A) Suction of compressor
    (B) Delivery of compressor
    (C) High pressure side close to receiver
    (D) Low pressure side near receiver

5. The temperature of air recorded by a thermometer, when it is not affected by the moisture present in the air, is called
    (A) Wet bulb temperature
    (B) Dry bulb temperature
    (C) Dew point temperature
    (D) None of these

6. Absorption system normally uses the following refrigerant
    (A) Freon-11
    (B) Freon-22
    (C) CO2
    (D) Ammonia

7. Which of the following statement is correct?
    (A) In vapour absorption refrigerator, the compression of refrigerant is avoided.
    (B) Sub-cooling can be achieved by circulating more quantity of cooling water through the condenser.
    (C) In vapour compression refrigeration, the vapour is drawn in the compressor cylinder during its suction stroke and is compressed adiabatically during the compression stroke.
    (D) All of the above

8. Allowable pressure on high pressure side or ammonia absorption system is of the order of
    (A) Atmospheric pressure
    (B) Slightly above atmospheric pressure
    (C) 24 bars
    (D) 56 bars

9. The C.O.P. of a Carnot refrigerator in winter will be _________ as compared to C.O.P. in summer.
    (A) Same
    (B) Lower
    (C) Higher
    (D) None of these

10. Chaperon equation is a relation between
    (A) Temperature, pressure and enthalpy
    (B) Specific volume and enthalpy
    (C) Temperature and enthalpy
    (D) Temperature, pressure, specific volume and enthalpy

11. During humidification process, __________ increases.
    (A) Wet bulb temperature
    (B) Relative humidity
    (C) Dry bulb temperature
    (D) Specific humidity

12. Where does the lowest temperature occur in a vapour compression cycle?
    (A) Condenser
    (B) Evaporator
    (C) Compressor
    (D) Expansion valve

13. The ratio of actual mass of water vapour in a given volume of moist air to the mass of water vapour in the same volume of saturated air at the same temperature and pressure, is called
    (A) Humidity ratio
    (B) Relative humidity
    (C) Absolute humidity
    (D) Degree of saturation

14. Under cooling in a refrigeration cycle
    (A) Increases C.O.P
    (B) Decreases C.O.P
    (C) C.O.P remains unaltered
    (D) Other factors decide C.O.P

15. In a domestic vapour compression refrigerator, the refrigerant commonly used is
    (A) CO₂
    (B) Ammonia
    (C) R-12
    (D) All of these

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