Mechanical Engineering - Heat Transfer, Refrigeration and Air Conditioning

26. 

The wet bulb depression indicates __________ humidity of the air.

A. absolute
B. relative
C. specific

Answer: Option B

Explanation:

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27. 

The refrigerant widely used in domestic refrigerators is

A. ammonia
B. carbon dioxide
C. sulphur dioxide
D. R-12

Answer: Option D

Explanation:

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28. 

When absorptivity (α) = 1, reflectivity (ρ) = 0 and transmittivity (τ) = 0, then the body is said to be a

A. black body
B. grey body
C. opaque body
D. white body

Answer: Option A

Explanation:

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29. 

Prandtl number (PN) is given by PN = μ.cp/k.

A. Yes
B. No

Answer: Option A

Explanation:

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30. 

In a vapour compression system, the condition of refrigerant before passing through the condenser is

A. saturated liquid
B. wet vapour
C. dry saturated vapour
D. superheated vapour

Answer: Option D

Explanation:

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