Heat Transfer

Question: A good refrigerant should have
[A].

high latent heat of vaporisation and low freezing point

[B].

high operating pressures and low freezing point

[C].

high specific volume and high latent heat of vaporisation

[D].

low C.O.P. and low freezing point

Answer: Option A

Explanation:

No answer description available for this question.

Question: In a lithium bromide absorption refrigeration system
[A].

lithium bromide is used as a refrigerant and water as an absorbent

[B].

water is used as a refrigerant and lithium bromide as an absorbent

[C].

ammonia is used as a refrigerant and lithium bromide as an absorbent

[D].

none of the above

Answer: Option B

Explanation:

No answer description available for this question.

Question: Hydrogen is used in electrolux refrigeration system so as to __________ the rate of evaporation of the liquid ammonia passing through the evaporator.
[A].

equalise

[B].

reduce

[C].

increase

Answer: Option C

Explanation:

No answer description available for this question.

Question: An electrolux refrigerator is called a __________ absorption system.
[A].

single fluid

[B].

two fluids

[C].

three fluids

Answer: Option C

Explanation:

No answer description available for this question.

Question: In aqua-ammonia and Lithium-bromide water absorption refrigeration systems, the refrigerants are respectively
[A].

water and water

[B].

water and lithium bromide

[C].

ammonia and lithium bromide

[D].

ammonia and water

Answer: Option D

Explanation:

No answer description available for this question.

Question: In aqua-ammonia absorption refrigeration system, incomplete rectification leads to accumulation of water in
[A].

condenser

[B].

evaporator

[C].

absorber

[D].

none of these

Answer: Option A

Explanation:

No answer description available for this question.

Question: In which of the following refrigeration system, waste heat can be effectively used?
[A].

Vapour compression cycle

[B].

Vapour absorption cycle

[C].

Air refrigeration cycle

[D].

none of these

Answer: Option B

Explanation:

No answer description available for this question.

Question: A vapour absorption refrigeration system
[A].

gives noisy operation

[B].

gives quiet operation

[C].

requires little power consumption

[D].

cools below 0° C

Answer: Option B

Explanation:

No answer description available for this question.

Question: In electrolux refrigerator
[A].

ammonia is absorbed in hydrogen

[B].

ammonia is absorbed in water

[C].

ammonia evaporates in hydrogen

[D].

hydrogen evaporates in ammonia

Answer: Option C

Explanation:

No answer description available for this question.

Question: In a vapour absorption refrigeration system, the compressor of the vapour compression system is replaced by
[A].

liquid pump

[B].

generator

[C].

absorber and generator

[D].

absorber, generator and liquid pump

Answer: Option D

Explanation:

No answer description available for this question.