50) During humidification process, __________ increases.

wet bulb temperature

relative humidity

dry bulb temperature

specific humidity

Answer is:

relative humidity

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51) A pressure gauge on the discharge side of a refrigerant compressor reads too high. The reasons will be

lack of cooling water

water temperature being high

dirty condenser surface

all of these

Answer is:

all of these

Explanation:

A pressure gauge on the discharge side of a refrigerant compressor reads too high. The reasons will be
* lack of cooling water
* water temperature being high
* dirty condenser surface

52) The counter-current flow heat exchanger can transfer __________ heat than parallel flow heat exchanger.

less

equal

none of these

Answer is:

53) The freon group of refrigerants are

halo-carbon refrigerants

azeotrope refrigerants

inorganic refrigerants

hydro-carbon refrigerants

Answer is:

halo-carbon refrigerants

54) For evaporators and condensers, for the given conditions, the logarithmic mean temperature difference (tm) for parallel flow is __________ that for counter flow.

equal to

less than

greater than

none of these

Answer is:

equal to

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