practice exam on refrigeration - Set 19 - ObjectiveBooks

practice exam on refrigeration - Set 19

Practice Test: Question Set - 19

1. In aqua ammonia absorption refrigeration system, incomplete rectification leads to accumulation of water in
    (A) Condenser
    (B) Evaporator
    (C) Absorber
    (D) None of these

2. Most air cooled condensers are designed to operate with a temperature difference of
    (A) 5°C
    (B) 8°C
    (C) 14°C
    (D) 22°C

3. In a reversed Brayton cycle, the heat is absorbed by the air during
    (A) Isentropic compression process
    (B) Constant pressure cooling process
    (C) Isentropic expansion process
    (D) Constant pressure expansion process

4. Wet bulb temperature is the temperature of air recorded by a thermometer, when
    (A) It is not affected by the moisture present in the air
    (B) Its bulb is surrounded by a wet cloth exposed to the air
    (C) The moisture present in it begins to condense
    (D) None of the above

5. The difference between dry bulb temperature and dew point temperature, is called
    (A) Dry bulb depression
    (B) Wet bulb depression
    (C) Dew point depression
    (D) Degree of saturation

6. In mechanical refrigeration system, the refrigerant has the maximum temperature
    (A) In evaporator
    (B) Before expansion valve
    (C) Between compressor and condenser
    (D) Between condenser and evaporator

7. The central air conditioning system has ___________ overall efficiency as compared to individual systems.
    (A) Same
    (B) Lower
    (C) Higher
    (D) None of these

8. Moisture should be removed from refrigerants to avoid
    (A) Freezing at the expansion valve
    (B) Restriction to refrigerant flow
    (C) Corrosion of steel plates
    (D) All of these

9. The specific humidity during humidification process
    (A) Remains constant
    (B) Increases
    (C) Decreases
    (D) None of these

10. During a refrigeration cycle, heat is rejected by the refrigerant in a
    (A) Compressor
    (B) Condenser
    (C) Evaporator
    (D) Expansion valve

11. In a vapour compression system, the condition of refrigerant is dry saturated vapour
    (A) Before entering the compressor
    (B) After leaving the compressor
    (C) Before entering the condenser
    (D) After leaving the condenser

12. During sensible cooling of air, specific humidity
    (A) Remains constant
    (B) Increases
    (C) Decreases
    (D) None of these

13. In a psychrometric chart, specific humidity (moisture content) lines are
    (A) Vertical and uniformly spaced
    (B) Horizontal and uniformly spaced
    (C) Horizontal and non-uniformly spaced
    (D) Curved lines

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

15. In a vapour compression refrigeration system, a throttle valve is used in place of an expander because
    (A) It considerably reduces mass of the system
    (B) It improves the C.O.P., as the condenser is small
    (C) The positive work in isentropic expansion of liquid is very small
    (D) It leads to significant cost reduction

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