Refrigeration And Air Conditioning MCQ Questions & Answers

Refrigeration And Air Conditioning MCQ Questions & Answers | Mechanical Engineering

Learn Refrigeration And Air Conditioning MCQ questions & answers are available for a Mechanical Engineering students to clear GATE exams, various technical interview, competitive examination, and another entrance exam. Refrigeration And Air Conditioning MCQ question is the important chapter for a Mechanical Engineering and GATE students. Page-2 section-3

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

Discuss

Answer & Solution

Answer: Option C

Solution:

The conditioned air supplied to the room must have the capacity to take up Both room sensible heat and latent heat loads

In a saturated air-water vapour mixture, the

A) Dry bulb temperature is higher than wet bulb temperature B) Dew point temperature is lower than wet bulb temperature C) Dry bulb, wet bulb and dew point temperature are same D) Dry bulb temperature is higher than dew point temperature

Discuss

Answer & Solution

Answer: Option C

Solution:

In a saturated air-water vapour mixture, theDry bulb, wet bulb and dew point temperature are same

The pressure at the inlet of a refrigerant compressor is called

A) Suction pressure B) Discharge pressure C) Critical pressure D) Back pressure

Discuss

Answer & Solution

Answer: Option A

Solution:

The pressure at the inlet of a refrigerant compressor is called Suction pressure

The pressure at the outlet of a refrigerant compressor is called

A) Suction pressure B) Discharge pressure C) Critical pressure D) Back pressure

Discuss

Answer & Solution

Answer: Option B

Solution:

The pressure at the outlet of a refrigerant compressor is called Discharge pressure

For obtaining high COP, the pressure range of compressor should be

A) High B) Low C) Optimum D) Any value

Discuss

Answer & Solution

Answer: Option B

Solution:

For obtaining high COP, the pressure range of compressor should be low

The refrigerant after condensation process is cooled below the saturation temperature before throttling. Such a process is called

A) Sub-cooling or under-cooling B) Super-cooling C) Normal cooling D) None of these

Discuss

Answer & Solution

Answer: Option A

Solution:

The refrigerant after condensation process is cooled below the saturation temperature before throttling. Such a process is called Sub-cooling or under-cooling

A valve which maintains a constant degree of superheat at the end of the evaporator coil, is called

A) Automatic expansion valve B) High side float valve C) Thermostatic expansion valve D) Low side float valve

Discuss

Answer & Solution

Answer: Option D

Solution:

Low Side Float Valves. The low side float type of the throttling valve is usually used in the flooded type of the refrigeration plants
A valve which maintains a constant degree of superheat at the end of the evaporator coil, is called Low Side Float Valves.

Formation of frost on evaporator in refrigerator

A) Results in loss of heat due to poor heat transfer B) Increases heat transfer rate C) Is immaterial D) Can be avoided by proper design

Discuss

Answer & Solution

Answer: Option A

Solution:

Formation of frost on evaporator in refrigerator Results in loss of heat due to poor heat transfer

The coefficient of performance of Electrolux refrigerator is the ratio of

A) Heat supplied by the gas burner to the heat absorbed by the evaporator B) Heat absorbed by the evaporator to the heat supplied by the gas burner C) Heat supplied by the gas burner minus the heat absorbed by the evaporator to the heat supplied by the gas burner D) Heat absorbed by the evaporator minus the heat supplied by the gas burner to the heat absorbed by the evaporator

Discuss

Answer & Solution

Answer: Option B

Solution:

The coefficient of performance of Electrolux refrigerator is the ratio of Heat absorbed by the evaporator to the heat supplied by the gas burner

Chaperon equation is applicable for registration at

A) Saturation point of vapour B) Saturation point of liquid C) Sublimation temperature D) Triple point

Discuss

Answer & Solution

Answer: Option A

Solution:

Chaperon equation is applicable for registration at Saturation point of vapour