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A multiple effect evaporator has a capacity to process 4000 kg of solid caustic soda per day, when it is concentrating from 10% to 25% solids. The water evaporated in kg per day is

CHEMICAL ENGINEERING, Heat Transfer /
Question: A multiple effect evaporator has a capacity to process 4000 kg of solid caustic soda per day, when it is concentrating from 10% to 25% solids. The water evaporated in kg per day is
[A].

6000

[B].

24000

[C].

60000

[D].

48000

Answer: Option B

Explanation:

No answer description available for this question.

A multiple effect evaporator has a capacity to process 4000 kg of solid caustic soda per day, when it is concentrating from 10% to 25% solids. The water evaporated in kg per day is Read More »

CHEMICAL ENGINEERING, Heat Transfer

For a counter current heat exchanger with Tih = 80°C, T°c = 60°C, T°h = 50°C and Tic = 30°C, and the temperature difference between the two streams being the same everywhere along Z, the direction of flow of hot fluid. The temperature profile should satisfy

CHEMICAL ENGINEERING, Heat Transfer /
Question: For a counter current heat exchanger with Tih = 80°C, T°c = 60°C, T°h = 50°C and Tic = 30°C, and the temperature difference between the two streams being the same everywhere along Z, the direction of flow of hot fluid. The temperature profile should satisfy
[A].

[B].

[C].

[D].

Answer: Option B

Explanation:

No answer description available for this question.

For a counter current heat exchanger with Tih = 80°C, T°c = 60°C, T°h = 50°C and Tic = 30°C, and the temperature difference between the two streams being the same everywhere along Z, the direction of flow of hot fluid. The temperature profile should satisfy Read More »

CHEMICAL ENGINEERING, Heat Transfer

The advantage of using a 1 – 2 shell and tube heat exchanger over a 1 – 1 shell and tube heat exchanger is

CHEMICAL ENGINEERING, Heat Transfer /
Question: The advantage of using a 1 – 2 shell and tube heat exchanger over a 1 – 1 shell and tube heat exchanger is
[A].

lower tube side pressure drop.

[B].

lower shell side pressure drop.

[C].

higher tube side heat transfer co-efficient.

[D].

higher shell side heat transfer co-efficient.

Answer: Option C

Explanation:

No answer description available for this question.

The advantage of using a 1 – 2 shell and tube heat exchanger over a 1 – 1 shell and tube heat exchanger is Read More »

CHEMICAL ENGINEERING, Heat Transfer

A steel sphere of radius 0.1 m at 400°K is immersed in an oil at 300°K. If the centre of the sphere reaches 350°K in 20 minutes, how long will it take for a 0.05 m radius steel sphere to reach the same temperature (at the centre) under identical conditions ? Assume that the conductive heat transfer co-efficient is infinitely large.

CHEMICAL ENGINEERING, Heat Transfer /
Question: A steel sphere of radius 0.1 m at 400°K is immersed in an oil at 300°K. If the centre of the sphere reaches 350°K in 20 minutes, how long will it take for a 0.05 m radius steel sphere to reach the same temperature (at the centre) under identical conditions ? Assume that the conductive heat transfer co-efficient is infinitely large.
[A].

5 minutes

[B].

10 minutes

[C].

20 minutes

[D].

40 minutes

Answer: Option A

Explanation:

No answer description available for this question.

A steel sphere of radius 0.1 m at 400°K is immersed in an oil at 300°K. If the centre of the sphere reaches 350°K in 20 minutes, how long will it take for a 0.05 m radius steel sphere to reach the same temperature (at the centre) under identical conditions ? Assume that the conductive heat transfer co-efficient is infinitely large. Read More »

CHEMICAL ENGINEERING, Heat Transfer

A sphere of radius ‘R1’ is enclosed in a sphere of radius ‘R2’. The view (or shape) factor for radiative heat transfer of the outer sphere with respect to the inner sphere is

CHEMICAL ENGINEERING, Heat Transfer /
Question: A sphere of radius ‘R1’ is enclosed in a sphere of radius ‘R2’. The view (or shape) factor for radiative heat transfer of the outer sphere with respect to the inner sphere is
[A].

0

[B].

R2/(R1+R2)

[C].

1

[D].

(R1/R2)2

Answer: Option B

Explanation:

No answer description available for this question.

A sphere of radius ‘R1’ is enclosed in a sphere of radius ‘R2’. The view (or shape) factor for radiative heat transfer of the outer sphere with respect to the inner sphere is Read More »

CHEMICAL ENGINEERING, Heat Transfer

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