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Engineering
Mechanical
ME Set-1
Heat Transfer Refrigeration and Air Conditioning
185

Heat Transfer Refrigeration and Air Conditioning MCQ with Answers

185) Emissivity of a body will be equal to its absorptivity at all temperatures.

Yes

No

Unknown

None

Answer is:

No

Heat Transfer Refrigeration and Air Conditioning MCQ with Answers

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Related Heat Transfer Refrigeration and Air Conditioning MCQ with Answers

186) R-12 is generally preferred over R-22 in deep freezers since

it has low operating pressures

it gives higher coefficient of performance

it is miscible with oil over large range of temperatures

all of the above

Answer is:

it is miscible with oil over large range of temperatures

187) The temperature of air recorded by a thermometer, when its bulb is surrounded by a wet cloth exposed to the air, is called

wet bulb temperature

dry bulb temperature

dew point temperature

none of these

Answer is:

wet bulb temperature

188) During sub-cooling, sensible heat from a liquid refrigerant is removed.

Yes

No

Unknown

None

Answer is:

Yes

189) If the energy radiated per second per sq. cm. of the surface for wave lengths lying between ?, and ? + d? is represented by (e?.d?), then e? is called

absorptive power

emissive power

emissivity

none of these

Answer is:

emissive power

Heat Transfer Refrigeration and Air Conditioning MCQ with Answers

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