A reversible engine has ideal thermal efficiency of 30%. When it is used as a refrigerating machine with all other conditions unchanged, the coefficient of performance will be

A)
2.33
B)
3.33
C)
4.33
D)
5.33

Correct Answer : Option (A) :   2.33

Recently Updated in Heat Transfer, Refrigeration and Air Conditioning Questions
The value of the wave length for maximum emissive power is given by
A)
Wein's law
B)
Stefan's law
C)
Planck's law
D)
Kirchhoff's law

Correct Answer :   Wein's law

Emissivity of a body will be equal to its absorptivity at all temperatures.
A)
Yes
B)
No
C)
Can Not Say
D)
None of the above

Correct Answer :   Yes

During dehumidification process, __________ remains constant.
A)
specific humidity
B)
dry bulb temperature
C)
relative humidity
D)
wet bulb temperature

Correct Answer :   dry bulb temperature

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