Mechanical Engineering - Heat Transfer, Refrigeration and Air Conditioning

41. 

The heat is transferred by conduction, convection and radiation in

A. melting of ice
B. boiler furnaces
C. condensation of steam in condenser
D. none of these

Answer: Option B

Explanation:

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42. 

A thermostatic expansion valve in a refrigeration system

A. ensures the evaporator completely filled with refrigerant of the load
B. is suitable only for constant load systems
C. maintains different temperatures in evaporator in proportion to load
D. none of the above

Answer: Option A

Explanation:

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43. 

The temperature rise, between the condenser outlet and expansion valve in ammonia vapour compression system, should be as low as possible.

A. Yes
B. No

Answer: Option A

Explanation:

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44. 

The ratio of the actual mass of water vapour in a unit mass of dry air to the mass of water vapour in the same mass of dry air when it is saturated at the same temperature and pressure, is called

A. humidity ratio
B. relative humidity
C. absolute humidity
D. degree of saturation

Answer: Option D

Explanation:

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45. 

For unsaturated air, the dew point temperature is __________ wet bulb temperature.

A. equal to
B. less than
C. more than

Answer: Option B

Explanation:

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