Mechanical Engineering - Heat Transfer, Refrigeration and Air Conditioning

31. 

If the condenser temperature is kept constant, the coefficient of performance of a refrigeration cycle increases with the increase in evaporator temperature.

A. Yes
B. No

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 caused by some mechanical means, is known as

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

Answer: Option C

Explanation:

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33. 

When α is absorptivity, ρ is reflectivity and τ is transmittivity, then for a diathermanous body,

A. α = 1, ρ = 0 and τ = 0
B. α = 0, ρ = 1 and τ = 0
C. α = 0, ρ = 0 and τ = 1
D. α + ρ = 1 and τ = 0

Answer: Option D

Explanation:

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34. 

When there is an addition of water vapour to the air of enclosed space, a gain in __________ is said to occur.

A. sensible heat
B. latent heat

Answer: Option B

Explanation:

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35. 

The relative humidity __________ as air gets drier.

A. increases
B. decreases

Answer: Option A

Explanation:

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