Refrigeration and Air-Conditioning Objective Type Questions - Set 09

Practice Test: Question Set - 09

1. Which of the following statement is correct?
    (A) The constant enthalpy lines are also constant wet bulb temperature lines
    (B) The wet bulb and dry bulb temperature are equal at saturation condition
    (C) The wet bulb temperature is a measure of enthalpy of moist air
    (D) All of the above

2. In vapour compression cycle, the condition of refrigerant is very wet vapour
    (A) After passing through the condenser
    (B) Before passing through the condenser
    (C) After passing through the expansion or throttle valve
    (D) Before entering the compressor

3. During cooling and dehumidification, dry bulb temperature
    (A) Remains constant
    (B) Increases
    (C) Decreases
    (D) None of these

4. Ammonia absorption refrigeration cycle requires
    (A) Very little work input
    (B) Maximum work input
    (C) Nearly same work input as for vapour compression cycle
    (D) Zero work input

5. Which of the following refrigerant has the highest freezing point.
    (A) Ammonia
    (B) Carbon dioxide
    (C) Sulphur dioxide
    (D) R-12

6. A standard ice point temperature corresponds to the temperature of
    (A) Water at 0°C
    (B) Ice at 4°C
    (C) Solid and dry ice
    (D) Mixture of ice and water under equilibrium conditions

7. The sub-cooling in a refrigeration cycle
    (A) Does not alter C.O.P.
    (B) Increases C.O.P.
    (C) Decreases C.O.P.
    (D) None of these

8. The condensing pressure due to the presence of non-condensable gases, as compared to that actually required for condensing temperatures without non-condensable gases,
    (A) Will be higher
    (B) Will be lower
    (C) Will remain unaffected
    (D) May be higher or lower depending upon the nature of non-condensable gases

9. The Freon group of refrigerants are
    (A) Halocarbon refrigerants
    (B) Zoetrope refrigerants
    (C) Inorganic refrigerants
    (D) Hydrocarbon refrigerants

10. For better C.O.P of refrigerator, the pressure range corresponding to temperature in evaporator and condenser must be
    (A) Small
    (B) High
    (C) Equal
    (D) Anything

11. In vapour compression refrigeration system, refrigerant occurs as liquid between
    (A) Condenser and expansion valve
    (B) Compressor and evaporator
    (C) Expansion valve and evaporator
    (D) Compressor and condenser

12. The wet bulb depression indicates _________ humidity of the air.
    (A) Absolute
    (B) Relative
    (C) Specific
    (D) None of these

13. The sensible heat factor during the heating and humidification process is given by (where h₁ = Enthalpy of air entering the heating coil, h₂ = Enthalpy of air leaving the heating coil, and hA = Enthalpy of air at the end of humidification process)
    (A) (hA - h2)/ (h1 - h2)
    (B) (h2 - hA)/ (h1 - h2)
    (C) (h1 - h2)/ (hA - h2)
    (D) (hA - h1)/ (h2 - h1)

14. The lower horizontal line of the refrigeration cycle plotted on pressure-enthalpy diagram represents
    (A) Condensation of the refrigerant vapour
    (B) Evaporation of the refrigerant liquid
    (C) Compression of the refrigerant vapour
    (D) Metering of the refrigerant liquid

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

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