Heat Transfer

Question: The capillary tube is not used in large capacity refrigeration systems because
[A].

cost is too high

[B].

capacity control is not possible

[C].

it is made of copper

[D].

required pressure drop can not be achieved

Answer: Option B

Explanation:

No answer description available for this question.

Question: The capillary tube, as an expansion device, is used in
[A].

domestic refrigerators

[B].

water coolers

[C].

room air conditioners

[D].

all of these

Answer: Option D

Explanation:

No answer description available for this question.

Question: In a refrigeration system, the expansion device is connected between the
[A].

compressor and condenser

[B].

condenser and receiver

[C].

receiver and evaporator

[D].

evaporator and compressor

Answer: Option C

Explanation:

No answer description available for this question.

Question: An evaporator is also known as
[A].

freezing coil

[B].

cooling coil

[C].

chilling coil

[D].

all of these

Answer: Option D

Explanation:

No answer description available for this question.

Question: The capacity of the cooling tower and spray ponds __________ as the wet bulb temperature of air decreases.
[A].

increases

[B].

decreases

Answer: Option A

Explanation:

No answer description available for this question.

Question: For ammonia refrigerating systems, the tubes of a shell and tube condenser are made of
[A].

copper

[B].

aluminium

[C].

steel

[D].

brass

Answer: Option C

Explanation:

No answer description available for this question.

Question: In a shell and coil condenser, water flows in the shell and the refrigerant in the coil.
[A].

True

[B].

False

Answer: Option B

Explanation:

No answer description available for this question.

Question: A water cooled condenser operates at a __________ condensing temperature than an air-cooled condenser.
[A].

higher

[B].

lower

Answer: Option B

Explanation:

No answer description available for this question.

Question: Most air cooled condensers are designed to operate with a temperature difference of
[A].

5°C

[B].

8°C

[C].

14°C

[D].

22°C

Answer: Option C

Explanation:

No answer description available for this question.

Question: In actual air-conditioning applications for R-12 and R-22, and operating at a condenser temperature of 40° C and an evaporator temperature of 5° C, the heat rejection factor is about
[A].

1

[B].

1.25

[C].

2.15

[D].

5.12

Answer: Option B

Explanation:

No answer description available for this question.