Heat Transfer

Thermal conductivity of non-metallic amorphous solids with decrease in temperature __________________?

Byadmin January 24, 2019August 16, 2021

Thermal conductivity of non-metallic amorphous solids with decrease in temperature __________________?

A. increases
B. decreases
C. remains constant
D. may increase or decrease depending on temperature
E. unpredictable

Heat Transfer | Mechanical Engineering | Refrigeration and Air Conditioning

In mechanical refrigeration system, the refrigerant has the maximum temperature

Question: In mechanical refrigeration system, the refrigerant has the maximum temperature
[A].

in evaporator
[B].
before expansion valve
[C].
between compressor and condenser
[D].
between condenser and evaporator

Answer: Option C

Explanation:

No answer description available for this question.

Read More In mechanical refrigeration system, the refrigerant has the maximum temperature
CHEMICAL ENGINEERING | Heat Transfer

Intermittant tube cleaning is possible to be done in case of a __________ evaporator.

Question: Intermittant tube cleaning is possible to be done in case of a __________ evaporator.
[A].

basket type
[B].
horizontal tube
[C].
calendria
[D].
none of these

Answer: Option A

Explanation:

No answer description available for this question.

Read More Intermittant tube cleaning is possible to be done in case of a __________ evaporator.
CHEMICAL ENGINEERING | Heat Transfer

In an extended surface heat exchanger, fluid having lower co-efficient

Question: In an extended surface heat exchanger, fluid having lower co-efficient
[A].

flows through the tube.
[B].
flows outside the tubes.
[C].
can flow either inside or outside the tubes.
[D].
should not be used as it gives very high pressure drop.

Answer: Option B

Explanation:

No answer description available for this question.

Read More In an extended surface heat exchanger, fluid having lower co-efficient
CHEMICAL ENGINEERING | Heat Transfer

In a heat exchanger, floating head is provided to

Question: In a heat exchanger, floating head is provided to
[A].

facilitate cleaning of the exchanger.
[B].
increase the heat transfer area.
[C].
relieve stresses caused by thermal expansion.
[D].
increase log mean temperature gradient.

Answer: Option C

Explanation:

No answer description available for this question.

Read More In a heat exchanger, floating head is provided to
Heat Transfer | Mechanical Engineering | Refrigeration and Air Conditioning

In aqua-ammonia and Lithium-bromide water absorption refrigeration systems, the refrigerants are respectively

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.

Read More In aqua-ammonia and Lithium-bromide water absorption refrigeration systems, the refrigerants are respectively
Heat Transfer | Mechanical Engineering | Refrigeration and Air Conditioning

In actual air-conditioning applications for R-12 and R-22, and operating at a condenser temperature of 40° C and an evaporator temperature of 5° C, the heat rejection factor is about

Question: In actual air-conditioning applications for R-12 and R-22, and operating at a condenser temperature of 40° C and an evaporator temperature of 5° C, the heat rejection factor is about
[A].

1
[B].
1.25
[C].
2.15
[D].
5.12

Answer: Option B

Explanation:

No answer description available for this question.

Read More In actual air-conditioning applications for R-12 and R-22, and operating at a condenser temperature of 40° C and an evaporator temperature of 5° C, the heat rejection factor is about

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