Refrigeration & Air-Conditioning Objective Questions with Answers - Set 02

Practice Test: Question Set - 02

1. The COP of a vapour compression plant in comparison to vapour absorption plant is
    (A) More
    (B) Less
    (C) Same
    (D) More/less depending on size of plant

2. The fluids used in Electrolux refrigerator are
    (A) Water and hydrogen
    (B) Ammonia and hydrogen
    (C) Ammonia, water and hydrogen
    (D) None of these

3. Domestic refrigerator working on vapour compression cycle uses the following type of expansion device
    (A) Electrically operated throttling valve
    (B) Manually operated valve
    (C) Thermostatic valve
    (D) Capillary tube

4. The condition of refrigerant after passing through the expansion or throttle valve, in a vapour compression system is
    (A) High pressure saturated liquid
    (B) Wet vapour
    (C) Very wet vapour
    (D) Dry vapour

5. An important characteristic of absorption system of refrigeration is
    (A) Noisy operation
    (B) Quiet operation
    (C) Cooling below 0°C
    (D) Very little power consumption

6. The centrifugal compressors are generally used for refrigerants that require
    (A) Small displacements and low condensing pressures
    (B) Large displacements and high condensing pressures
    (C) Small displacements and high condensing pressures
    (D) Large displacements and low condensing pressures

7. Rick up the incorrect statement
    (A) Lithium bromide used in vapour absorption cycle is non volatile
    (B) Lithium bromide plant can't operate below 0°C
    (C) A separator is used in lithium bromide plant to remove the unwanted water vapour by condensing
    (D) Concentration of solution coming out of lithium bromide generator is more in comparison to that entering the generator

8. During dehumidification process, the relative humidity
    (A) Remains constant
    (B) Increases
    (C) Decreases
    (D) None of these

9. The refrigerant widely used in domestic refrigerators is
    (A) Ammonia
    (B) Carbon dioxide
    (C) Sulphur dioxide
    (D) R-12

10. The moisture in a refrigerant is removed by
    (A) Evaporator
    (B) Safety relief valve
    (C) Dehumidifier
    (D) Driers

11. During sensible cooling of air ________ decreases.
    (A) Wet bulb temperature
    (B) Relative humidity
    (C) Dry bulb temperature
    (D) Specific humidity

12. At lower temperatures and pressures, the latent heat of vaporisation of a refrigerant
    (A) Decreases
    (B) Increases
    (C) Remain same
    (D) Depends on other factors

13. The wet bulb depression is zero when relative humidity is
    (A) Zero
    (B) 0.5
    (C) 0.75
    (D) 1.0

14. The C.O.P of a refrigeration cycle with increase in evaporator temperature, keeping condenser temperature constant, will
    (A) Increase
    (B) Decrease
    (C) Remain unaffected
    (D) May increase or decrease depending on the type of refrigerant used

15. During humidification process, dry bulb temperature
    (A) Remains constant
    (B) Increases
    (C) Decreases
    (D) None of these

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