Mechanical Engineering - Heat Transfer, Refrigeration and Air Conditioning

46. 

When the discharge pressure is too high in a refrigeration system, high pressure control is installed to stop the compressor.

A. Correct
B. Incorrect

Answer: Option A

Explanation:

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47. 

A grey body is one whose absorptivity does not vary with temperature and wave length of the incident ray.

A. True
B. False

Answer: Option A

Explanation:

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48. 

The wet bulb temperature during sensible cooling of air

A. remains constant
B. increases
C. decreases

Answer: Option C

Explanation:

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49. 

In absorption vapour systems, the refrigerant widely used is R-12.

A. Correct
B. Incorrect

Answer: Option B

Explanation:

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50. 

Hydrogen is used in electrolux refrigeration system so as to __________ the rate of evaporation of the liquid ammonia passing through the evaporator.

A. equalise
B. reduce
C. increase

Answer: Option C

Explanation:

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