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.
Yes
No
Answer: Option
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
conduction
free convection
forced convection
radiation
Answer: Option
Explanation:
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33.
When α is absorptivity, ρ is reflectivity and τ is transmittivity, then for a diathermanous body,
α = 1, ρ = 0 and τ = 0
α = 0, ρ = 1 and τ = 0
α = 0, ρ = 0 and τ = 1
α + ρ = 1 and τ = 0
Answer: Option
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.
sensible heat
latent heat
Answer: Option
Explanation:
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35.
The relative humidity __________ as air gets drier.
increases
decreases
Answer: Option
Explanation:
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