Refrigeration and Air Conditioning

Question: During sensible cooling,
[A].

relative humidity remains constant

[B].

wet bulb temperature increases

[C].

specific humidity increases

[D].

partial pressure of vapour remains constant

Answer: Option D

Explanation:

No answer description available for this question.

Question: The by-pass factor for a cooling coil
[A].

increases with increase in velocity of air passing through it

[B].

decreases with increase in velocity of air passing through it

[C].

remains unchanged with increase in velocity of air passing through it

[D].

may increase or decrease with increase in velocity of air passing through it depending upon the condition of air entering

Answer: Option A

Explanation:

No answer description available for this question.

Question: In case ofsensible cooling of air, the coil efficiency is given by
[A].

B.P.F. – 1

[B].

1 – B.P.F.

[C].

[D].

1 + B.P.F.

Answer: Option B

Explanation:

No answer description available for this question.

Question: 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:

No answer description available for this question.

Question: During sensible cooling of air, the relative humidity increases.
[A].

Yes

[B].

No

Answer: Option A

Explanation:

No answer description available for this question.

Question: During sensible cooling of air __________ decreases.
[A].

wet bulb temperature

[B].

relative humidity

[C].

dry bulb temperature

[D].

specific humidity

Answer: Option C

Explanation:

No answer description available for this question.

Question: During sensible cooling of air, specific humidity
[A].

remains constant

[B].

increases

[C].

decreases

Answer: Option A

Explanation:

No answer description available for this question.

Question: The atmospheric air at dry bulb temperature of 15°C enters a heating coil maintained at 40°C. The air leaves the heating coil at 25°C. The by-pass factor of the heating coil is
[A].

0.376

[B].

0.4

[C].

0.6

[D].

0.67

Answer: Option C

Explanation:

No answer description available for this question.

Question: In case of sensible heating of air, the coil efficiency is given by (where B.P.F. = By-pass factor)
[A].

B.P.F. – 1

[B].

1 – B.P.F.

[C].

[D].

1 + B.RF.

Answer: Option B

Explanation:

No answer description available for this question.

Question: The by-pass factor (B. P. F.) in case of sensible heating of air is (Where td1 = Dry bulb temperature of air entering the heating coil, td2 = Dry bulb temperature of air leaving the heating coil, and td3 = Dry bulb temperature of heating coil)
[A].

[B].

[C].

[D].

Answer: Option B

Explanation:

No answer description available for this question.