Refrigeration and Air Conditioning

Question: For air conditioning the operation theatre in a hospital, the percentage of outside air in the air supplied is
[A].

zero

[B].

20

[C].

50

[D].

100

Answer: Option D

Explanation:

No answer description available for this question.

Question: The alignment circle is marked on the psychrometric chart at
[A].

20°C DBT and 50% RH

[B].

26°C DBT and 50% RH

[C].

20°C DBT and 60% RH

[D].

26°C DBT and 60% RH

Answer: Option B

Explanation:

No answer description available for this question.

Question: The central air conditioning system has __________ overall efficiency as compared to individual systems.
[A].

same

[B].

lower

[C].

higher

Answer: Option C

Explanation:

No answer description available for this question.

Question: Dehydration is the process of removing water vapour from the surrounding air.
[A].

True

[B].

False

Answer: Option A

Explanation:

No answer description available for this question.

Question: Air conditioning means
[A].

cooling

[B].

heating

[C].

dehumidifying

[D].

all of these

Answer: Option D

Explanation:

No answer description available for this question.

Question: A human body feels comfortable when the heat produced by the metabolism of human body is equal to the
[A].

heat dissipated to the surroundings

[B].

heat stored in the human body

[C].

sum of (a) and (b)

[D].

difference of (a) and (b)

Answer: Option C

Explanation:

No answer description available for this question.

Question: It is desired to condition the outside air from 70% relative humidity and 45° C dry bulb temperature to 50% relative humidity and 25° C dry bulb temperature (room condition). The practical arrangement will be
[A].

dehumidification

[B].

cooling and humidification

[C].

cooling and dehumidification

[D].

dehumidification and pure sensible cooling

Answer: Option C

Explanation:

No answer description available for this question.

Question: In order to cool and dehumidify a stream of moist air, it must be passed over the coil at a temperature
[A].

which lies between the dry bulb and wet bulb temperatures of the incoming stream

[B].

which lies between the wet bulb and dew point temperatures of the incoming stream

[C].

which is lower than the dew point temperature of the incoming stream

[D].

of adiabatic saturation of incoming stream

Answer: Option C

Explanation:

No answer description available for this question.

Question: In a spray washing system, if the temperature of water is higher than the dry bulb temperature of entering air, then the air is
[A].

heated and dehumidified

[B].

heated and humidified

[C].

cooled and humidified

[D].

cooled and dehumidified

Answer: Option B

Explanation:

No answer description available for this question.

Question: In chemical dehumidification process,
[A].

dew point temperature decreases

[B].

wet bulb temperature decreases

[C].

dry bulb temperature increases

[D].

all of these

Answer: Option D

Explanation:

No answer description available for this question.