48) 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

1 kW

2 kW

3 kW

4 kW

Answer is:

4 kW

Explanation:

(COP)h + (COP)r = 1
therefore,
(COP)r = 4 (COP)r = R.E / W_in
R .E = (COP)r * W_in = 4 kW

Heat Transfer Refrigeration and Air Conditioning MCQ with Answers

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Related Heat Transfer Refrigeration and Air Conditioning MCQ with Answers

49) The curved lines on a psychrometric chart indicates

dry bulb temperature

wet bulb temperature

dew point temperature

relative humidity

Answer is:

relative humidity

50) During humidification process, __________ increases.

wet bulb temperature

relative humidity

dry bulb temperature

specific humidity

Answer is:

relative humidity

51) A pressure gauge on the discharge side of a refrigerant compressor reads too high. The reasons will be

lack of cooling water

water temperature being high

dirty condenser surface

all of these

Answer is:

all of these

Explanation:

A pressure gauge on the discharge side of a refrigerant compressor reads too high. The reasons will be
* lack of cooling water
* water temperature being high
* dirty condenser surface

52) The counter-current flow heat exchanger can transfer __________ heat than parallel flow heat exchanger.

less

equal

none of these

Answer is:

Heat Transfer Refrigeration and Air Conditioning MCQ with Answers

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