Mechanical Engineering - Heat Transfer, Refrigeration and Air Conditioning

16. 

The C.O.P. of a Carnot refrigerator in winter will be __________ as compared to C.O.P. in summer.

A. same
B. lower
C. higher

Answer: Option C

Explanation:

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17. 

Which of the following statement is correct?

A. The human body can lose heat even if its temperature is less than the atmospheric temperature.
B. The increase in air movement increases the evaporation from the human body.
C. The warm air increases the rate of radiation of heat from the human body.
D. both (a) and (b)

Answer: Option D

Explanation:

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18. 

When the temperature of the surrounding is higher than the temperature of the body, then the heat loss by convection from the body to the surrounding will be

A. positive
B. negative
C. zero
D. none of these

Answer: Option B

Explanation:

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19. 

If a gas is to be liquified, its temperature must be

A. increased to a value above its critical temperature
B. reduced to a value below its critical temperature
C. equal to critical temperature
D. none of the above

Answer: Option C

Explanation:

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20. 

The thermostatic expansion valve is used in __________ type of evaporators.

A. flooded
B. DX coil
C. dry

Answer: Option C

Explanation:

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