310) A Bell Coleman refrigerator working on dense air system as compared to open air system, for the same range of temperature, results in __________ power per tonne of refrigeration.

Answer is:

lower

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

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

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

Answer is:

0.1 m

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

Answer is:

receiver and evaporator

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

Answer is:

1+(1/C.O.P)

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