Top 250+ Solved Refrigeration and Air conditioning MCQ Questions Answer

From 166 to 180 of 284

Q. The ratio of water vapour to the mass of dry air in a given mixture is known as

a. Humidity ratio

b. Relative humidity

c. Degree of saturation

d. Any of the above

e. None of the above

  • a. Humidity ratio

Q. When air is adiabatically saturated, the temperature attained is known as

a. Dew point temp

b. Dry bulb temp

c. Adiabatically sturated temp

d. Wet bulb temp

e. Critical temp

  • d. Wet bulb temp

Q. In case air is cooled by a process in which the humidity ratio of air does not change, the process is known as

a. Ventilation

b. Humidification

c. Chilling

d. Sensible cooling

e. Dehumidification

  • d. Sensible cooling

Q. If the compressor of a refrigeration system is noisy, it shows that

a. Compressor drive coupling is loose

b. Lack of oil

c. Internal parts of compressor broken

d. Compressor or motor loose on base

e. Any of the above

  • e. Any of the above

Q. Which of the following refrigerant is highly toxic?

a. Freon 12

b. Carbondioxide

c. Ammonia

d. Freon 22

e. Sulphurdioxide

  • e. Sulphurdioxide

Q. For for measurement of temperature in cryogenic range the thermometers used are

a. Gas thermometers

b. Electronic digital instruments

c. Mercury thermometers

d. Pyrometers

e. Radiation pyrometers

  • a. Gas thermometers

Q. The freezing point of ammonia is

a. ? 132.5?C

b. ? 20?C

c. ? 77.8?C

d. ? 202.5?C

e. 0?C

  • c. ? 77.8?C

Q. Presence of moisture in a refrigeration cycle will show its effect at

a. Compressor suction

b. Compressor discharge

c. Expansion valve

d. Condenser

e. All of the above

  • c. Expansion valve

Q. One tonne of refrigeration is equivalent to SI units of

a. 3.5 kW

b. 10 kW

c. 5 kW

d. 1 kW

e. 2.5 kW

  • a. 3.5 kW

Q. In vapour compression cycle the highest temperature of the refrigerant during the cycle occurs

a. After expansion valve

b. After evaporator

c. After condenser

d. After compression

e. None of the above

  • d. After compression

Q. Sub-cooling is

a. Removing sensible heat from a liquid

b. Removing latent heat from a gas

c. Cooling a liquid below 0?C.

d. Cooling a part of liquid

e. Differential cooling of a liquid

  • d. Cooling a part of liquid

Q. Which of the following refrigerant is the cheapest?

a. Air

b. Ammonia

c. Methyl chloride

d. Freon 12

e. Freon 22

  • a. Air

Q. Which of the following is not a property of Carbondioxide?

a. Non-toxic

b. Non-inflammable

c. Colourless

d. Pungent odour

e. All of the above

  • d. Pungent odour

Q. If a room has bad ammonia leaks

a. Lights should be switched off

b. No specific precautions are needed

c. One should wait for sometime

d. Gas mask should be put on

e. Before entering the room fans should be put on

  • d. Gas mask should be put on
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