Efficiency of a Carnot engine is given as 80%. If the- cycle direction be reversed, what will be the value of COP of reversed Carnot cycle_________________?

Question: Which of the following represents a heat pump?
[A].

[B].

[C].

[D].

Answer: Option B

Explanation:

No answer description available for this question.

Question: According to Newton’s law of cooling, the heat transfer from a hot body to a cold body is
[A].

directly proportional to the surface area

[B].

directly proportional to the difference of temperatures between the two bodies

[C].

either (a) or (b)

[D].

both (a) and (b)

Answer: Option D

Explanation:

No answer description available for this question.

Question: A steam pipe is to be lined with two layers of insulating materials of different thermal conductivities. For the minimum heat transfer,
[A].

the better insulation must be put inside

[B].

the better insulation must be put outside

[C].

one could place either insulation on either side

[D].

one should take into account the steam temperature before deciding as to which insulation is put where

Answer: Option A

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: 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.