In a vapour compression refrigeration system, a throttle valve is used in place of an expander because

A)
it leads to significant cost reduction
B)
it considerably reduces mass of the system
C)
the positive work in isentropic expansion of liquid is very small
D)
it improves the C.O.P., as the condenser is small

Correct Answer : Option (C) :   the positive work in isentropic expansion of liquid is very small

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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