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Out of the following four assumptions used in the derivation of the equation for LMTD , which one is subject to the largest deviation in practice ?

CHEMICAL ENGINEERING, Heat Transfer /
Question: Out of the following four assumptions used in the derivation of the equation for LMTD , which one is subject to the largest deviation in practice ?
[A].

Constant overall heat transfer co-efficient.

[B].

Constant rate of fluid flow.

[C].

Constant specific heat.

[D].

No partial phase change in the system.

Answer: Option B

Explanation:

No answer description available for this question.

Out of the following four assumptions used in the derivation of the equation for LMTD , which one is subject to the largest deviation in practice ? Read More »

CHEMICAL ENGINEERING, Heat Transfer

LMTD for counterflow and prallel flow heat exchanger will be the same, when the

CHEMICAL ENGINEERING, Heat Transfer /
Question: LMTD for counterflow and prallel flow heat exchanger will be the same, when the
[A].

cold fluid is heated to a certain temperature by condensing steam (isothermal fluid).

[B].

outlent temperature of both the hot and cold fluid are same.

[C].

outlet temperature of hot fluid is less than the outlet temperature of the cold fluid.

[D].

none of these.

Answer: Option A

Explanation:

No answer description available for this question.

LMTD for counterflow and prallel flow heat exchanger will be the same, when the Read More »

CHEMICAL ENGINEERING, Heat Transfer

In case of parallel flow heat exchanger, the lowest temperature theoretically attainable by the hot fluid is __________ the outlet temperature of the cold fluid.

CHEMICAL ENGINEERING, Heat Transfer /
Question: In case of parallel flow heat exchanger, the lowest temperature theoretically attainable by the hot fluid is __________ the outlet temperature of the cold fluid.
[A].

equal to

[B].

more than

[C].

less than

[D].

either more or less than (depending upon the fluid)

Answer: Option A

Explanation:

No answer description available for this question.

In case of parallel flow heat exchanger, the lowest temperature theoretically attainable by the hot fluid is __________ the outlet temperature of the cold fluid. Read More »

CHEMICAL ENGINEERING, Heat Transfer

An equipment which converts the latent or sensible heat of one fluid into the latent heat of vaporisation of another, is called a

CHEMICAL ENGINEERING, Heat Transfer /
Question: An equipment which converts the latent or sensible heat of one fluid into the latent heat of vaporisation of another, is called a
[A].

boiler

[B].

heat exchanger

[C].

recuperator

[D].

regenerator

Answer: Option B

Explanation:

No answer description available for this question.

An equipment which converts the latent or sensible heat of one fluid into the latent heat of vaporisation of another, is called a Read More »

CHEMICAL ENGINEERING, Heat Transfer

In regenerative air preheater (as practised in heating of coke ovens), the heat is transferred

CHEMICAL ENGINEERING, Heat Transfer /
Question: In regenerative air preheater (as practised in heating of coke ovens), the heat is transferred
[A].

through a metallic wall.

[B].

by direct contact of hot flue gas with air.

[C].

by heating an intermediate material (like chequor bricks) and then heating the air from this hot material.

[D].

none of these.

Answer: Option C

Explanation:

No answer description available for this question.

In regenerative air preheater (as practised in heating of coke ovens), the heat is transferred Read More »

CHEMICAL ENGINEERING, Heat Transfer

Latent heat absorbed by 1 lb of water at 212°F, when it is changed to steam at 212°F, may be around __________ BTU.

CHEMICAL ENGINEERING, Heat Transfer /
Question: Latent heat absorbed by 1 lb of water at 212°F, when it is changed to steam at 212°F, may be around __________ BTU.
[A].

180

[B].

970

[C].

3.97

[D].

none of these

Answer: Option A

Explanation:

No answer description available for this question.

Latent heat absorbed by 1 lb of water at 212°F, when it is changed to steam at 212°F, may be around __________ BTU. Read More »

CHEMICAL ENGINEERING, Heat Transfer