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March 2019

Which of the following parameters of the fluid is not very important, while deciding its route in a shell and tube heat exchanger ?

Chemical Heat Transfer /
Which of the following parameters of the fluid is not very important, while deciding its route in a shell and tube heat exchanger ?

A. Corrosiveness & fouling characteristics
B. Pressure
C. Viscosity
D. Density

Which of the following parameters of the fluid is not very important, while deciding its route in a shell and tube heat exchanger ? Read More »

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____________________?

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____________________?

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

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____________________? Read More »

Chemical Heat Transfer

In case of a multipass shell and tube heat exchanger, the temperature drop in the fluid _______________?

Chemical Heat Transfer /
In case of a multipass shell and tube heat exchanger, the temperature drop in the fluid _______________?

A. Is inversely proportional to the resistance across which the drop occurs
B. And the wall are proportional to individual resistances
C. And the wall is not related
D. None of these

In case of a multipass shell and tube heat exchanger, the temperature drop in the fluid _______________? Read More »

Chemical Heat Transfer

The capacity of double-effect evaporator is less than half of the capacity of two single effects, each of which is operating over same terminal temperature difference, when the________________ ?

Chemical Heat Transfer /
The capacity of double-effect evaporator is less than half of the capacity of two single effects, each of which is operating over same terminal temperature difference, when the________________ ?

A. Solution has an elevation of boiling point
B. Evaporators operate under vacuum
C. Evaporators operate at atmospheric pressure
D. None of these

The capacity of double-effect evaporator is less than half of the capacity of two single effects, each of which is operating over same terminal temperature difference, when the________________ ? Read More »

Chemical Heat Transfer