Top 250+ Solved Refrigeration and Air conditioning MCQ Questions Answer

From 226 to 240 of 284

Q. At 100% humidity

a. We bulb temperature is same as atmospheric temperature

b. Dry bulb temperature is same as atmospheric temperature

c. Wet bulb temperature is same as dry bulb temperature

d. Dry bulb temperature is exactly half the wet bulb temperature

e. Wet bulb temperature is exactly half the dry bulb temperature

  • c. Wet bulb temperature is same as dry bulb temperature

Q. Which of the following symptoms will indicate under charging of a vapour compressor refrigeration cycle?

a. Compressor runs continuously

b. Frost on suction line

c. Low suction pressure

d. Low head pressure

e. All of the above

  • b. Frost on suction line

Q. The drift loss in cooling towers is around

a. 40 to 50%

b. 1%

c. 10 to 20%

d. 2 to 5%

e. 30 to 35%

  • c. 10 to 20%

Q. Cooling towers are used for cooling water

a. To be used for cooling the compressor

b. To be used for filtration of air

c. To be injected in circulating air

d. To be used for humidification

e. To be used for cooling the building

  • a. To be used for cooling the compressor

Q. Refrigerant 744 is

a. Carbondioxide

b. Freon 22

c. Freon 12

d. Air

e. Ammonia

  • a. Carbondioxide

Q. In a ammonia vapour compression cycle during gas charging the connection is made

a. Anywhere in the cycle

b. At the compressor cycle

c. On low pressure side near evaporat

d. At the compressor outlet

e. On high pressure side close to receiver

  • e. On high pressure side close to receiver

Q. In central air conditioning system

a. Entire equipment is placed in the air conditioned space

b. There is only one machine which performs the function of air conditioning

c. All the major equipment is located in one central space removed from the air to be conditioned

d. Is used when small area is to be air conditioned

e. None of the above

  • c. All the major equipment is located in one central space removed from the air to be conditioned

Q. A refrigerant cycle is usually a

a. Open cycle

b. Closed cycle

c. Mixed cycle

d. Hybrid cycle

e. None of the above

  • b. Closed cycle

Q. Refrigerant R-40 is

a. Air

b. Methyl chloride

c. Glycol

d. Brine

e. None of the above

  • b. Methyl chloride

Q. In order to ensure leak proof mechanical links, the end of copper tubing in refrigeration cycle is

a. Flared

b. Brazed

c. Soldered

d. Press-fitted

e. (C) and (D) together

  • a. Flared

Q. A Bell-Coleman cycle is

a. Reversed Otto cycle

b. Reversed Carnot cycle

c. Reversed Sterling cycle

d. Reversed Joule cycle

e. Reversed Rankine cycle

  • d. Reversed Joule cycle

Q. On a particular time of a day if dry bulb temperature is equal to the wet bulb temperature, then it can be safely concluded that

a. Dew point was less than 20?C

b. Rain had occurred one or two hours earlier

c. Relative humidity of air was 100%

d. Specific humidity of air was 0.010 kg per kg of dry air

e. Atmospheric air was free from moisture

  • c. Relative humidity of air was 100%

Q. Which of the following is not a dehydrator?

a. Silica sel

b. Molecular sieve

c. Calcium chloride

d. Sodium chloride

e. All of the above

  • e. All of the above

Q. A water cooler is installed with one ton vapour compression cycle. In 24 hours it will provide

a. 0.1 ton of cold water

b. One tonne of cold water

c. The change is gradual throughout the cycle

d. More than one tonne of cold water

e. Half ton of cold water

  • d. More than one tonne of cold water

Q. In rainy season desert coolers become ineffective

a. Because of low temperature

b. Pleasant weather

c. Rain serves the purpose of cooler

d. Humidity of air increases

e. None of the above

  • d. Humidity of air increases
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