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CHEMICAL ENGINEERING

In pipe flow, heat is transferred from hot wall to the liquid by

CHEMICAL ENGINEERING, Heat Transfer /
Question: In pipe flow, heat is transferred from hot wall to the liquid by
[A].

conduction only.

[B].

forced convection only.

[C].

forced convection and conduction.

[D].

free and forced convection.

Answer: Option C

Explanation:

No answer description available for this question.

In pipe flow, heat is transferred from hot wall to the liquid by Read More »

CHEMICAL ENGINEERING, Heat Transfer

If Prandtl number is greater than the Schmidt number, then the

CHEMICAL ENGINEERING, Heat Transfer /
Question: If Prandtl number is greater than the Schmidt number, then the
[A].

thermal boundary layer lies inside the concentration boundary layer.

[B].

concentration boundary layer lies inside the thermal boundary layer.

[C].

thermal & concentration boundary layers are of equal thickness.

[D].

hydrodynamic(i.e., momentum)boundary layer is thicker than the other two.

Answer: Option A

Explanation:

No answer description available for this question.

If Prandtl number is greater than the Schmidt number, then the Read More »

CHEMICAL ENGINEERING, Heat Transfer

For a laminar flow of fluid in a circular tube, ‘h1’ is the convective heat transfer co-efficient at velocity ‘V1’. If the velocity is reduced by half and assuming the fluid properties are constant, the new convective heat transfer co-efficient is

CHEMICAL ENGINEERING, Heat Transfer /
Question: For a laminar flow of fluid in a circular tube, ‘h1’ is the convective heat transfer co-efficient at velocity ‘V1’. If the velocity is reduced by half and assuming the fluid properties are constant, the new convective heat transfer co-efficient is
[A].

1.26 h1

[B].

0.794 h1

[C].

0.574 h1

[D].

1.741 h1

Answer: Option B

Explanation:

No answer description available for this question.

For a laminar flow of fluid in a circular tube, ‘h1’ is the convective heat transfer co-efficient at velocity ‘V1’. If the velocity is reduced by half and assuming the fluid properties are constant, the new convective heat transfer co-efficient is Read More »

CHEMICAL ENGINEERING, Heat Transfer

For turbulent flow in a tube, the heat transfer co-efficient is obtained from the Dittus-Boelter correlation. If the tube diameter is halved and the flow rate is doubled, then the heat transfer co-efficient will change by a factor of

CHEMICAL ENGINEERING, Heat Transfer /
Question: For turbulent flow in a tube, the heat transfer co-efficient is obtained from the Dittus-Boelter correlation. If the tube diameter is halved and the flow rate is doubled, then the heat transfer co-efficient will change by a factor of
[A].

1

[B].

1.74

[C].

6.1

[D].

37

Answer: Option C

Explanation:

No answer description available for this question.

For turbulent flow in a tube, the heat transfer co-efficient is obtained from the Dittus-Boelter correlation. If the tube diameter is halved and the flow rate is doubled, then the heat transfer co-efficient will change by a factor of Read More »

CHEMICAL ENGINEERING, Heat Transfer

A composite flat wall of a furnace is made of two materials ‘A’ and ‘B’. The thermal conductivity of ‘A’ is twice of that of material ‘B’, while the thickness of layer of ‘A’ is half that of B. If the temperature at the two sides of the wall are 400 and 1200°K, then the temperature drop (in °K) across the layer of material ‘A’ is

CHEMICAL ENGINEERING, Heat Transfer /
Question: A composite flat wall of a furnace is made of two materials ‘A’ and ‘B’. The thermal conductivity of ‘A’ is twice of that of material ‘B’, while the thickness of layer of ‘A’ is half that of B. If the temperature at the two sides of the wall are 400 and 1200°K, then the temperature drop (in °K) across the layer of material ‘A’ is
[A].

125

[B].

133

[C].

150

[D].

160

Answer: Option D

Explanation:

No answer description available for this question.

A composite flat wall of a furnace is made of two materials ‘A’ and ‘B’. The thermal conductivity of ‘A’ is twice of that of material ‘B’, while the thickness of layer of ‘A’ is half that of B. If the temperature at the two sides of the wall are 400 and 1200°K, then the temperature drop (in °K) across the layer of material ‘A’ is Read More »

CHEMICAL ENGINEERING, Heat Transfer

Heat transfer by natural convection is enhanced in system with

CHEMICAL ENGINEERING, Heat Transfer /
Question: Heat transfer by natural convection is enhanced in system with
[A].

high viscosity.

[B].

high co-efficient of thermal expansion.

[C].

low temperature gradients.

[D].

low density change with temperature.

Answer: Option B

Explanation:

No answer description available for this question.

Heat transfer by natural convection is enhanced in system with Read More »

CHEMICAL ENGINEERING, Heat Transfer

In a heat exchanger, floating head is provided to

CHEMICAL ENGINEERING, Heat Transfer /
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.

In a heat exchanger, floating head is provided to Read More »

CHEMICAL ENGINEERING, Heat Transfer

Heat transfer occurs by natural convection because change in temperature causes difference in

CHEMICAL ENGINEERING, Heat Transfer /
Question: Heat transfer occurs by natural convection because change in temperature causes difference in
[A].

viscosity

[B].

density

[C].

thermal conductivity

[D].

heat capacity

Answer: Option B

Explanation:

No answer description available for this question.

Heat transfer occurs by natural convection because change in temperature causes difference in Read More »

CHEMICAL ENGINEERING, Heat Transfer

In an interphase heat transfer process, the equilibrium state corresponds to equality of temperature in the two phases, while the condition for equilibrium in an interphase mass transfer process is equality of

CHEMICAL ENGINEERING, Heat Transfer /
Question: In an interphase heat transfer process, the equilibrium state corresponds to equality of temperature in the two phases, while the condition for equilibrium in an interphase mass transfer process is equality of
[A].

concentrations

[B].

chemical potentials

[C].

activity co-efficients

[D].

mass transfer co-efficients

Answer: Option A

Explanation:

No answer description available for this question.

In an interphase heat transfer process, the equilibrium state corresponds to equality of temperature in the two phases, while the condition for equilibrium in an interphase mass transfer process is equality of Read More »

CHEMICAL ENGINEERING, Heat Transfer

A multiple effect evaporator as compared to a single effect evaporator of the same capacity has

CHEMICAL ENGINEERING, Heat Transfer /
Question: A multiple effect evaporator as compared to a single effect evaporator of the same capacity has
[A].

lower heat transfer area.

[B].

lower steam economy.

[C].

higher steam economy.

[D].

higher solute concentration in the product.

Answer: Option C

Explanation:

No answer description available for this question.

A multiple effect evaporator as compared to a single effect evaporator of the same capacity has Read More »

CHEMICAL ENGINEERING, Heat Transfer