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CHEMICAL ENGINEERING

Critical value of the __________ number governs the transition from laminar to turbulent flow in free convection heat transfer.

CHEMICAL ENGINEERING, Heat Transfer /
Question: Critical value of the __________ number governs the transition from laminar to turbulent flow in free convection heat transfer.
[A].

Grashoff

[B].

Reynolds

[C].

both ‘a’ & ‘b’

[D].

Prandtl & Grashoff

Answer: Option D

Explanation:

No answer description available for this question.

Critical value of the __________ number governs the transition from laminar to turbulent flow in free convection heat transfer. Read More »

CHEMICAL ENGINEERING, Heat Transfer

LMTD for evaporators & condensers for a given terminal parameters & set of conditions for counterflow is equal to that for parallel flow. In such heat exchangers, with one of the fluids condensing or evaporating, the surface area required is the least in the __________ flow.

CHEMICAL ENGINEERING, Heat Transfer /
Question: LMTD for evaporators & condensers for a given terminal parameters & set of conditions for counterflow is equal to that for parallel flow. In such heat exchangers, with one of the fluids condensing or evaporating, the surface area required is the least in the __________ flow.
[A].

parallel

[B].

mixed

[C].

counterflow

[D].

same in either ‘a’, b’ or ‘c’

Answer: Option D

Explanation:

No answer description available for this question.

LMTD for evaporators & condensers for a given terminal parameters & set of conditions for counterflow is equal to that for parallel flow. In such heat exchangers, with one of the fluids condensing or evaporating, the surface area required is the least in the __________ flow. Read More »

CHEMICAL ENGINEERING, Heat Transfer

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

CHEMICAL ENGINEERING, Heat Transfer /
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.

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

CHEMICAL ENGINEERING, Heat Transfer

For gases, the thermal conductivity increases with temperature rise. For liquids, with increase in concentration, its thermal conductivity generally

CHEMICAL ENGINEERING, Heat Transfer /
Question: For gases, the thermal conductivity increases with temperature rise. For liquids, with increase in concentration, its thermal conductivity generally
[A].

decreases

[B].

increases

[C].

remains unchanged

[D].

increases exponentially

Answer: Option A

Explanation:

No answer description available for this question.

For gases, the thermal conductivity increases with temperature rise. For liquids, with increase in concentration, its thermal conductivity generally Read More »

CHEMICAL ENGINEERING, Heat Transfer

Multiple effect evaporation is generally recommended, when the

CHEMICAL ENGINEERING, Heat Transfer /
Question: Multiple effect evaporation is generally recommended, when the
[A].

large scale evaporation of liquor is needed.

[B].

corrosive liquids are to be concentrated.

[C].

fuel is cheaply available.

[D].

evaporation on small scale is to be done.

Answer: Option A

Explanation:

No answer description available for this question.

Multiple effect evaporation is generally recommended, when the Read More »

CHEMICAL ENGINEERING, Heat Transfer

In case of heat flow by conduction for a cylindrical body with an internal heat source, the nature of temperature distribution is

CHEMICAL ENGINEERING, Heat Transfer /
Question: In case of heat flow by conduction for a cylindrical body with an internal heat source, the nature of temperature distribution is
[A].

linear

[B].

hyperbolic

[C].

parabolic

[D].

none of these

Answer: Option C

Explanation:

No answer description available for this question.

In case of heat flow by conduction for a cylindrical body with an internal heat source, the nature of temperature distribution is Read More »

CHEMICAL ENGINEERING, Heat Transfer

Heat transfer co-efficient equation for forced convection, Nu = 0.023 Re0.8 . Prn, is not valid, if the value of

CHEMICAL ENGINEERING, Heat Transfer /
Question: Heat transfer co-efficient equation for forced convection, Nu = 0.023 Re0.8 . Prn, is not valid, if the value of
[A].

n = 0.4 is used for heating.

[B].

n = 0.3 is used for cooling.

[C].

Reynolds number for the flow involved is > 10000.

[D].

Reynolds number for the flow involved is < 2100.

Answer: Option D

Explanation:

No answer description available for this question.

Heat transfer co-efficient equation for forced convection, Nu = 0.023 Re0.8 . Prn, is not valid, if the value of Read More »

CHEMICAL ENGINEERING, Heat Transfer

Arithmetic mean area can be used in heat transfer problem to calculate the heat flow by conduction through a cylinder which is

CHEMICAL ENGINEERING, Heat Transfer /
Question: Arithmetic mean area can be used in heat transfer problem to calculate the heat flow by conduction through a cylinder which is
[A].

thin walled having the value of Ao Ai/< 2.

[B].

thick walled.

[C].

having the value of Ao/Ai > 2.

[D].

both (b) and (c).

Answer: Option A

Explanation:

No answer description available for this question.

Arithmetic mean area can be used in heat transfer problem to calculate the heat flow by conduction through a cylinder which is Read More »

CHEMICAL ENGINEERING, Heat Transfer