Practice Test on Refrigeration and Air conditioning - ObjectiveBooks

Practice Test on Refrigeration and Air conditioning

Practice Test: Question Set - 20

1. Which of the following refrigerant is highly toxic and flammable?
    (A) Ammonia
    (B) Carbon dioxide
    (C) Sulphur dioxide
    (D) R-12

2. The dehumidification process, on the psychrometric chart, is shown by
    (A) Horizontal line
    (B) Vertical line
    (C) Inclined line
    (D) Curved line

3. The wet bulb temperature at 100% relative humidity is ________ dry bulb temperature.
    (A) Same as
    (B) Lower than
    (C) Higher than
    (D) None of these

4. The human body feels comfortable when the heat stored in the body is
    (A) Positive
    (B) Negative
    (C) Zero
    (D) None of these

5. The heat rejection factor (HRF) is given by
    (A) 1 + C.O.P
    (B) 1 - C.O.P.
    (C) 1 + (1/C.O.P)
    (D) 1 - (1/C.O.P)

6. In order to collect liquid refrigerant and to prevent it from going to a ________, a device known as accumulator is used at the suction of compressor.
    (A) Compressor
    (B) Condenser
    (C) Expansion valve
    (D) Evaporator

7. The vertical and uniformly spaced lines on a psychrometric chart indicates
    (A) Dry bulb temperature
    (B) Wet bulb temperature
    (C) Dew point temperature
    (D) Specific humidity

8. The undesirable property of a refrigerant is
    (A) Non-toxic
    (B) Non-flammable
    (C) Non-explosive
    (D) High boiling point

9. The process, generally used in summer air conditioning to cool and dehumidify the air, is called
    (A) Humidification
    (B) Dehumidification
    (C) Heating and humidification
    (D) Cooling and dehumidification

10. The leakage in a refrigeration system using ammonia is detected by
    (A) Halide torch
    (B) Sulphur sticks
    (C) Soap and water
    (D) All of these

11. The lowest temperature during the cycle in a vapour compression system occurs after
    (A) Compression
    (B) Expansion
    (C) Condensation
    (D) Evaporation

12. In a domestic refrigerator, a capillary tube controls the flow of refrigerant from the
    (A) Expansion valve to the evaporator
    (B) Evaporator to the thermostat
    (C) Condenser to the expansion valve
    (D) Condenser to the evaporator

13. The refrigerant used in small tonnage commercial machines (hermetically sealed units) is
    (A) Ammonia
    (B) Carbon dioxide
    (C) Sulphur dioxide
    (D) R-12

14. When the air is passed through an insulated chamber having sprays of water maintained at a temperature higher than the dew point temperature of entering air but lower than its dry bulb temperature, then the air is said to be
    (A) Cooled and humidified
    (B) Cooled and dehumidified
    (C) Heated and humidified
    (D) Heated and dehumidified

15. A refrigerant compressor is used to
    (A) Raise the pressure of the refrigerant
    (B) Raise the temperature of the refrigerant
    (C) Circulate the refrigerant through the refrigerating system
    (D) All of the above

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