Mechanical Engineering

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.

Question: A condenser is used in the __________ pressure side of a refrigerating system.
[A].

low

[B].

high

Answer: Option B

Explanation:

No answer description available for this question.

Question: A pressure gauge on the discharge side of a refrigerant compressor reads too high. The reasons will be
[A].

lack of cooling water

[B].

water temperature being high

[C].

dirty condenser surface

[D].

all of these

Answer: Option D

Explanation:

No answer description available for this question.

Question: For large tonnage (more than 200 TR) air-conditioning applications, the compressor recommended is
[A].

reciprocating

[B].

rotating

[C].

centrifugal

[D].

screw

Answer: Option C

Explanation:

No answer description available for this question.

Question: A refrigerant compressor is used to
[A].

raise the pressure of the refrigerant

[B].

raise the temperature of the refrigerant

[C].

circulate the refrigerant through the refrigerating system

[D].

all of the above

Answer: Option D

Explanation:

No answer description available for this question.