Refrigeration and Air-Conditioning Online Practice Tests - Set 10

Practice Test: Question Set - 10

1. The conditioned air supplied to the room must have the capacity to take up
    (A) Room sensible heat load only
    (B) Room latent heat load only
    (C) Both room sensible heat and latent heat loads
    (D) None of the above

2. Moisture in Freon refrigeration system causes
    (A) Ineffective refrigeration
    (B) High power consumption
    (C) Freezing automatic regulating valve
    (D) Corrosion of whole system

3. The boiling point of ________ is 10.5°C.
    (A) Ammonia
    (B) R-12
    (C) Sulphur dioxide
    (D) Carbon dioxide

4. The refrigeration effect in a dry evaporator compared to flooded evaporator in a similar plant is
    (A) Same
    (B) More
    (C) Less
    (D) More or less depending on ambient conditions

5. The index which correlates the combined effects of air temperature, relative humidity and air velocity on the human body, is known as
    (A) Mean radiant temperature
    (B) Effective temperature
    (C) Dew point temperature
    (D) None of these

6. Which of the following refrigerants has lowest freezing point?
    (A) Freon-12
    (B) NH3
    (C) CO2
    (D) Freon-22

7. The thermostatic expansion valve is used in ________ type of evaporators.
    (A) Flooded
    (B) DX coil
    (C) Dry
    (D) None of these

8. The boiling point of ammonia is
    (A) 100°C
    (B) 50°C
    (C) 33.3°C
    (D) 0°C

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

10. The relative coefficient of performance is
    (A) Actual COP/theoretical COP
    (B) Theoretical COP/actual COP
    (C) Actual COP × theoretical COP
    (D) None of these

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

12. Vapour compression refrigeration is somewhat like
    (A) Carnot cycle
    (B) Rankine’s cycle
    (C) Reversed Carnot cycle
    (D) None of the above

13. A heat pump working on a reversed Carnot cycle has a C.O.P. of 5. It works as a refrigerator taking 1 kW of work input. The refrigerating effect will be
    (A) 1 kW
    (B) 2 kW
    (C) 3 kW
    (D) 4 kW

14. Aqua ammonia is used as refrigerant in the following type of refrigeration system
    (A) Compression
    (B) Direct
    (C) Indirect
    (D) Absorption

15. Air conditioning means
    (A) Cooling
    (B) Heating
    (C) Dehumidifying
    (D) All of these

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