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Mechanical Engineering

Which of the following statement is correct for ammonia as a refrigerant?

Heat Transfer, Mechanical Engineering, Refrigeration and Air Conditioning /
Question: Which of the following statement is correct for ammonia as a refrigerant?
[A].

It is toxic to mucous membranes.

[B].

it requires large displacement per TR compared to fluoro carbons.

[C].

It reacts with copper and its alloys.

[D].

all of these

Answer: Option D

Explanation:

No answer description available for this question.

Which of the following statement is correct for ammonia as a refrigerant? Read More »

Heat Transfer, Mechanical Engineering, Refrigeration and Air Conditioning

Which of the following refrigerant has the lowest freezing point?

Heat Transfer, Mechanical Engineering, Refrigeration and Air Conditioning /
Question: Which of the following refrigerant has the lowest freezing point?
[A].

R-11

[B].

R-12

[C].

R-22

[D].

Ammonia

Answer: Option C

Explanation:

No answer description available for this question.

Which of the following refrigerant has the lowest freezing point? Read More »

Heat Transfer, Mechanical Engineering, Refrigeration and Air Conditioning

A good refrigerant should have

Heat Transfer, Mechanical Engineering, Refrigeration and Air Conditioning /
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.

A good refrigerant should have Read More »

Heat Transfer, Mechanical Engineering, Refrigeration and Air Conditioning

In a lithium bromide absorption refrigeration system

Heat Transfer, Mechanical Engineering, Refrigeration and Air Conditioning /
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.

In a lithium bromide absorption refrigeration system Read More »

Heat Transfer, Mechanical Engineering, Refrigeration and Air Conditioning

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

Heat Transfer, Mechanical Engineering, Refrigeration and Air Conditioning /
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.

Hydrogen is used in electrolux refrigeration system so as to __________ the rate of evaporation of the liquid ammonia passing through the evaporator. Read More »

Heat Transfer, Mechanical Engineering, Refrigeration and Air Conditioning

An electrolux refrigerator is called a __________ absorption system.

Heat Transfer, Mechanical Engineering, Refrigeration and Air Conditioning /
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.

An electrolux refrigerator is called a __________ absorption system. Read More »

Heat Transfer, Mechanical Engineering, Refrigeration and Air Conditioning