Mechanical Engineering - Heat Transfer, Refrigeration and Air Conditioning

6. 

In a psychrometric chart, dew point temperature lines are horizontal and non-uniformly spaced.

A. Correct
B. Incorrect

Answer: Option A

Explanation:

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7. 

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

A. increases
B. decreases

Answer: Option B

Explanation:

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8. 

The by-pass factor, in case of sensible cooling of air, is given by (where td1 = Dry bulb temperature of air entering the cooling coil, td2 = Dry bulb temperature of air leaving the cooling coil, and td3 = Dry bulb temperature of the cooling coil)

A.
B.
C.
D.

Answer: Option B

Explanation:

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9. 

The evaporator used in house-hold refrigerators is

A. frosting evaporator
B. non-frosting evaporator
C. defrosting evaporator
D. none of these

Answer: Option A

Explanation:

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10. 

The drier in a refrigeration system removes moisture in the system.

A. Correct
B. Incorrect

Answer: Option A

Explanation:

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