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Heat Transfer

A heat exchanger with heat transfer surface area A and overall heat transfer coefficient U handles two fluids of heat capacities Cmax and Cmin. The number of transfer units (NTU) used in the analysis of heat exchanger is specified as

Heat Transfer, Mechanical Engineering, Refrigeration and Air Conditioning /
Question: A heat exchanger with heat transfer surface area A and overall heat transfer coefficient U handles two fluids of heat capacities Cmax and Cmin. The number of transfer units (NTU) used in the analysis of heat exchanger is specified as
[A].

[B].

[C].

AU Cmin

[D].

Answer: Option D

Explanation:

No answer description available for this question.

A heat exchanger with heat transfer surface area A and overall heat transfer coefficient U handles two fluids of heat capacities Cmax and Cmin. The number of transfer units (NTU) used in the analysis of heat exchanger is specified as Read More »

Heat Transfer, Mechanical Engineering, Refrigeration and Air Conditioning

In a shell and tube heat exchanger, baffles are provided on the shell side to

Heat Transfer, Mechanical Engineering, Refrigeration and Air Conditioning /
Question: In a shell and tube heat exchanger, baffles are provided on the shell side to
[A].

improve heat transfer

[B].

provide support for tubes

[C].

prevent stagnation of shell side fluid

[D].

all of these

Answer: Option D

Explanation:

No answer description available for this question.

In a shell and tube heat exchanger, baffles are provided on the shell side to Read More »

Heat Transfer, Mechanical Engineering, Refrigeration and Air Conditioning

In counter-current flow heat exchangers

Heat Transfer, Mechanical Engineering, Refrigeration and Air Conditioning /
Question: In counter-current flow heat exchangers
[A].

both the fluids at inlet are in their hottest state

[B].

both the fluids at inlet are in their coldest state

[C].

both the fluids at exit are in their hottest state

[D].

one fluid is coldest and the other is hottest at inlet

Answer: Option A

Explanation:

No answer description available for this question.

In counter-current flow heat exchangers Read More »

Heat Transfer, Mechanical Engineering, Refrigeration and Air Conditioning

In counter-current flow heat exchanger, the logarithmic temperature difference between the fluids is __________ as compared to parallel flow heat exchanger.

Heat Transfer, Mechanical Engineering, Refrigeration and Air Conditioning /
Question: In counter-current flow heat exchanger, the logarithmic temperature difference between the fluids is __________ as compared to parallel flow heat exchanger.
[A].

same

[B].

less

[C].

greater

Answer: Option C

Explanation:

No answer description available for this question.

In counter-current flow heat exchanger, the logarithmic temperature difference between the fluids is __________ as compared to parallel flow heat exchanger. Read More »

Heat Transfer, Mechanical Engineering, Refrigeration and Air Conditioning

In a parallel flow heat exchanger, the rate of flow of heat and the rate of decrease of temperature are maximum.

Heat Transfer, Mechanical Engineering, Refrigeration and Air Conditioning /
Question: In a parallel flow heat exchanger, the rate of flow of heat and the rate of decrease of temperature are maximum.
[A].

Yes

[B].

No

Answer: Option A

Explanation:

No answer description available for this question.

In a parallel flow heat exchanger, the rate of flow of heat and the rate of decrease of temperature are maximum. Read More »

Heat Transfer, Mechanical Engineering, Refrigeration and Air Conditioning

Logarithmic mean temperature difference is the same as the arithmetic mean temperature difference.

Heat Transfer, Mechanical Engineering, Refrigeration and Air Conditioning /
Question: Logarithmic mean temperature difference is the same as the arithmetic mean temperature difference.
[A].

Agree

[B].

Disagree

Answer: Option B

Explanation:

No answer description available for this question.

Logarithmic mean temperature difference is the same as the arithmetic mean temperature difference. Read More »

Heat Transfer, Mechanical Engineering, Refrigeration and Air Conditioning

A device used for transfering heat from one fluid to another is called heat exchanger.

Heat Transfer, Mechanical Engineering, Refrigeration and Air Conditioning /
Question: A device used for transfering heat from one fluid to another is called heat exchanger.
[A].

True

[B].

False

Answer: Option A

Explanation:

No answer description available for this question.

A device used for transfering heat from one fluid to another is called heat exchanger. Read More »

Heat Transfer, Mechanical Engineering, Refrigeration and Air Conditioning