Mechanical Engineering - Heat Transfer, Refrigeration and Air Conditioning

31. 

The power per tonne of refrigeration is

A. 3.5/C.O.P.
B. C.O.P/3.5
C. 3.5 x C.O.P.
D. none of these

Answer: Option A

Explanation:

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32. 

The process of heat transfer from one particle of the fluid to another by the actual movement of the fluid particles due to difference of density caused by temperature of the particle is known as

A. conduction
B. free convection
C. forced convection
D. radiation

Answer: Option B

Explanation:

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33. 

The thermostatic expansion valve is also called

A. constant pressure valve
B. constant temperature valve
C. constant superheat valve
D. none of these

Answer: Option C

Explanation:

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34. 

In figure shown, E is a heat engine with efficiency of 0.4 and R is a refrigerator. It is given that Q2 + Q4 = 3Q1. The C.O.P. of the refrigerator is

A. 2.5
B. 3.0
C. 4.0
D. 5.0

Answer: Option D

Explanation:

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35. 

The specific humidity during cooling and dehumidification

A. remains constant
B. increases
C. decreases

Answer: Option C

Explanation:

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