311) The amount of heat flow through a body by conduction is

directly proportional to the surface area of the body

directly proportional to the temperature difference on the two faces of the body

inversely proportional to the thickness of the body

all of the above

Answer is:

all of the above

Explanation:

The amount of heat flow through a body by conduction is
* directly proportional to the surface area of the body
* directly proportional to the temperature difference on the two faces of the body
* inversely proportional to the thickness of the body

Heat Transfer Refrigeration and Air Conditioning MCQ with Answers

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Related Heat Transfer Refrigeration and Air Conditioning MCQ with Answers

312) A furnace is made of a red brick wall of thickness 0.5 m and conductivity 0.7 W/mK. For the same heat loss and temperature drop, this can be replaced by a layer of diatomite earth of conductivity 0.14 W/mK and thickness

0.5 m

0.1 m

0.2 m

0.5 m

Answer is:

0.1 m

313) In a refrigeration system, the expansion device is connected between the

compressor and condenser

condenser and receiver

receiver and evaporator

evaporator and compressor

Answer is:

receiver and evaporator

314) The heat rejection factor (HRF) is given by

1 + C.O.P

1 - C.O.P.

1+(1/C.O.P)

1-(1/C.O.P)

Answer is:

1+(1/C.O.P)

315) Wein's law states that the wave length corresponding to __________ is proportional to the absolute temperature.

minimum energy

maximum energy

zero energy

none of these

Answer is:

maximum energy

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