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

Byadmin March 2, 2019August 24, 2021

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

Chemical Heat Transfer

The advantage of backward feed multiple effect evaporators over forward feed units is that___________________?

The advantage of backward feed multiple effect evaporators over forward feed units is that___________________?

A. Heat sensitive material can be handled
B. There is no additional cost of pumg
C. Most concentrated liquid is at highest temperature
D. Equal heat transfer co-efficients exist in various effects

Read More The advantage of backward feed multiple effect evaporators over forward feed units is that___________________?
Chemical Heat Transfer

It is desired to concentrate a 20% salt solution (20 kg of salt in 100 kg of solution) to a 30% salt solution in an evaporator. Consider a feed of 300 kg/min at 30°C. The boiling point of the solution is 110°C, the latent heat of vaporisation is 2100 kJ/kg and the specific heat of the solution is 4 kJ/kg.K. The rate at which the heat has to be supplied in (kJ/min) to the evaporator is____________________?

It is desired to concentrate a 20% salt solution (20 kg of salt in 100 kg of solution) to a 30% salt solution in an evaporator. Consider a feed of 300 kg/min at 30°C. The boiling point of the solution is 110°C, the latent heat of vaporisation is 2100 kJ/kg and the specific heat of the solution is 4 kJ/kg.K. The rate at which the heat has to be supplied in (kJ/min) to the evaporator is____________________?

A. 3.06 × 105
B. 6.12 × 105
C. 7.24 × 105
D. 9.08 × 105

Read More It is desired to concentrate a 20% salt solution (20 kg of salt in 100 kg of solution) to a 30% salt solution in an evaporator. Consider a feed of 300 kg/min at 30°C. The boiling point of the solution is 110°C, the latent heat of vaporisation is 2100 kJ/kg and the specific heat of the solution is 4 kJ/kg.K. The rate at which the heat has to be supplied in (kJ/min) to the evaporator is____________________?
Chemical Heat Transfer

For what value of Prandtl number, St = f/2 ?

For what value of Prandtl number, St = f/2 ?

A. 1.5
B. 1
C. > 1
D. < 1

Read More For what value of Prandtl number, St = f/2 ?
Chemical Heat Transfer

For large heat transfer area requirement, shell and tube heat exchanger is preferred, because it________________?

For large heat transfer area requirement, shell and tube heat exchanger is preferred, because it________________?

A. Occupies smaller space
B. Is more economical
C. Is easy to operate and maintain
D. All A., B. and C.

Read More For large heat transfer area requirement, shell and tube heat exchanger is preferred, because it________________?
Chemical 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 ?

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

Read More 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 Heat Transfer

It is not recommended to use a 1-2 shell and tube heat exchanger for a particular heat duty, whenever the LMTD correction factor is___________________?

It is not recommended to use a 1-2 shell and tube heat exchanger for a particular heat duty, whenever the LMTD correction factor is___________________?

A. > 0.75
B. < 0.75
C. < 0.50
D. < 0.25

Read More It is not recommended to use a 1-2 shell and tube heat exchanger for a particular heat duty, whenever the LMTD correction factor is___________________?

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