Mechanical Engineering

Question: In order to collect liquid refrigerant and to prevent it from going to a __________ , a device known as accumulator is used at the suction of compressor.
[A].

compressor

[B].

condenser

[C].

expansion valve

[D].

evaporator

Answer: Option A

Explanation:

No answer description available for this question.

Question: During sub-cooling, sensible heat from a liquid refrigerant is removed.
[A].

Yes

[B].

No

Answer: Option A

Explanation:

No answer description available for this question.

Question: In a pressure enthalpy chart, the space between the saturated liquid line and saturated vapour line, represents sub-cooled liquid region.
[A].

True

[B].

False

Answer: Option B

Explanation:

No answer description available for this question.

Question: In a pressure enthalpy chart, the space to the left of the saturated liquid line represents
[A].

wet vapour region

[B].

superheated vapour region

[C].

sub-cooled liquid region

[D].

none of these

Answer: Option C

Explanation:

No answer description available for this question.

Question: In a vapour compression system, the condition of refrigerant is dry saturated vapour
[A].

before entering the compressor

[B].

after leaving the compressor

[C].

before entering the condenser

[D].

after leaving the condenser

Answer: Option A

Explanation:

No answer description available for this question.

Question: In a vapour compression refrigeration system, a throttle valve is used in place of an expander because
[A].

it considerably reduces mass of the system

[B].

it improves the C.O.P., as the condenser is small

[C].

the positive work in isentropic expansion of liquid is very small

[D].

it leads to significant cost reduction

Answer: Option C

Explanation:

No answer description available for this question.

Question: Defrosting of a refrigerator may be done by stopping the compressor for a short period.
[A].

Correct

[B].

Incorrect

Answer: Option A

Explanation:

No answer description available for this question.

Question: In a vapour compression system, the condition of refrigerant before passing through the condenser is
[A].

saturated liquid

[B].

wet vapour

[C].

dry saturated vapour

[D].

superheated vapour

Answer: Option D

Explanation:

No answer description available for this question.

Question: In a vapour compression system, the condition of refrigerant before entering the expansion or throttle valve is
[A].

high pressure saturated liquid

[B].

wet vapour

[C].

very wet vapour

[D].

dry vapour

Answer: Option A

Explanation:

No answer description available for this question.

Question: During a refrigeration cycle, heat is rejected by the refrigerant in a
[A].

compressor

[B].

condenser

[C].

evaporator

[D].

expansion valve

Answer: Option B

Explanation:

No answer description available for this question.