Refrigeration and Air Conditioning

Which of the following refrigerants has lowest freezing point_______________?

Byadmin January 25, 2019August 16, 2021

Which of the following refrigerants has lowest freezing point_______________?

A. Freon-12
B. NH3
C. C02
D. Freon-22
E. S02

Refrigeration and Air Conditioning

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_________________?

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_________________?

A. 1.25
B. 0.8
C. 0.5
D. 0.25
E. none of the above

Read More 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_________________?
Heat Transfer | Mechanical Engineering | Refrigeration and Air Conditioning

Dry bulb temperature is the temperature of air recorded by a thermometer, when

Question: Dry bulb temperature is the temperature of air recorded by a thermometer, when
[A].

it is not affected by the moisture present in the air
[B].
its bulb is surrounded by a wet cloth exposed to the air
[C].
the moisture present in it begins to condense
[D].
none of the above

Answer: Option A

Explanation:

No answer description available for this question.

Read More Dry bulb temperature is the temperature of air recorded by a thermometer, when
Heat Transfer | Mechanical Engineering | Refrigeration and Air Conditioning

During adiabatic saturation process on unsaturated air __________ remains constant.

Question: During adiabatic saturation process on unsaturated air __________ remains constant.
[A].

relative humidity
[B].
dew point temperature
[C].
dry bulb temperature
[D].
wet bulb temperature

Answer: Option D

Explanation:

No answer description available for this question.

Read More During adiabatic saturation process on unsaturated air __________ remains constant.
Refrigeration and Air Conditioning

The condensing pressure due to the presence of non-condensable gases, as compared to that actually required for condensing temperatures without non-condensable gases ____________________ ?

The condensing pressure due to the presence of non-condensable gases, as compared to that actually required for condensing temperatures without non-condensable gases ____________________ ?

A. will be higher
B. will be lower
C. will remain unaffected
D. may be higher or lower depending upon the nature of non-condensable gases
E. unpredictable

Read More The condensing pressure due to the presence of non-condensable gases, as compared to that actually required for condensing temperatures without non-condensable gases ____________________ ?
Heat Transfer | Mechanical Engineering | Refrigeration and Air Conditioning

Kirchhoff’s law states that

Question: Kirchhoff’s law states that
[A].

the total radiation from a black body per second per unit area is directly proportional to the fourth power of the absolute temperature
[B].
the wave length corresponding to the maximum energy is proportional to the absolute temperature
[C].
the ratio of the emissive power and absorptive power of all bodies is the same and is equal to the emissive power of a perfectly black body
[D].
none of the above

Answer: Option C

Explanation:

No answer description available for this question.

Read More Kirchhoff’s law states that
Heat Transfer | Mechanical Engineering | Refrigeration and Air Conditioning

A vapour absorption refrigeration system

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.

Read More A vapour absorption refrigeration system