Heat Transfer, Refrigeration and Air Conditioning - Section 1

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Heat Transfer, Refrigeration and Air Conditioning - Section 1

The temperature of ammonia after compression in a vapour compression system is

A.	20 to 50° C
B.	50 to 70° C
C.	70 to 110° C
D.	none of these

Answer: Option C

Explanation:

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The relative humidity decreases as air gets wet.

A.	True
B.	False

Answer: Option A

Explanation:

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A water cooled condenser operates at a __________ condensing temperature than an air-cooled condenser.

A.	higher
B.	lower

Answer: Option B

Explanation:

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In case of solids, the heat transfer takes place according to radiation.

A.	Correct
B.	Incorrect

Answer: Option B

Explanation:

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The critical radius is the insulation radius at which the resistance to heat flow is

A.	maximum
B.	minimum
C.	zero
D.	none of these

Answer: Option B

Explanation:

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During sensible cooling of air __________ decreases.

A.	wet bulb temperature
B.	relative humidity
C.	dry bulb temperature
D.	specific humidity

Answer: Option C

Explanation:

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Nusselt number (N_N) is given by

A.
B.
C.
D.

Answer: Option A

Explanation:

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The subcooling in a refrigeration cycle

A.	does not alter C.O.P.
B.	increases C.O.P.
C.	decreases C.O.P.
D.	none of these

Answer: Option B

Explanation:

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Heat Transfer, Refrigeration and Air Conditioning - Section 1

Heat Transfer, Refrigeration and Air Conditioning - Section 1

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