Heat Transfer Refrigeration and Air Conditioning MCQ with Answers

Heat Transfer Refrigeration and Air Conditioning MCQ with Answers

76) The wet bulb temperature at 100% relative humidity is __________ dew point temperature.

Answer is:

same as

77) The use of heat exchangers is made in

Answer is:

all of the above

Explanation:

The use of heat exchangers is made in
* radiators in automobile
* condensers and boilers in steam plants
* condensers and evaporators in refrigeration and air conditioning units

78) In a heat exchanger with one fluid evaporating or condensing, the surface area required is least in

Answer is:

all of these

Explanation:

In a heat exchanger with one fluid evaporating or condensing, the surface area required is least in
* parallel flow
* counter flow
* cross flow

79) Which of the following statement is correct?

Answer is:

At thermal equilibrium, the emissivity and absorptivity are same.

80) The horizontal and uniformly spaced lines on a psychrometric chart indicates relative humidity.

Answer is:

76) The wet bulb temperature at 100% relative humidity is __________ dew point temperature.

same as

77) The use of heat exchangers is made in

all of the above

78) In a heat exchanger with one fluid evaporating or condensing, the surface area required is least in

all of these

79) Which of the following statement is correct?

At thermal equilibrium, the emissivity and absorptivity are same.

80) The horizontal and uniformly spaced lines on a psychrometric chart indicates relative humidity.

Incorrect