Mechanical Engineering - Heat Transfer, Refrigeration and Air Conditioning

31. 

Sulphur dioxide is extremely toxic and non-flammable.

A. True
B. False

Answer: Option A

Explanation:

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32. 

The transfer of heat from one body to another takes place only when there is a temperature difference between the bodies.

A. Yes
B. No

Answer: Option A

Explanation:

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33. 

A heat exchanger with heat transfer surface area A and overall heat transfer coefficient U handles two fluids of heat capacities Cmax and Cmin. The number of transfer units (NTU) used in the analysis of heat exchanger is specified as

A.
B.
C. AU Cmin
D.

Answer: Option D

Explanation:

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34. 

Thermal diffusivity of a substance is given by (where h = Thermal diffusivity, ρ = Density of substance, S = Specific heat, and k = Thermal conductivity)

A.
B.
C.
D.

Answer: Option A

Explanation:

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35. 

Which of the following statement is correct for ammonia as a refrigerant?

A. It is toxic to mucous membranes.
B. it requires large displacement per TR compared to fluoro carbons.
C. It reacts with copper and its alloys.
D. all of these

Answer: Option D

Explanation:

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