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Chemical Heat Transfer

In case of vertical tube evaporator, with increase in liquor level, the overall heat transfer co-efficient______________?

Chemical Heat Transfer /
In case of vertical tube evaporator, with increase in liquor level, the overall heat transfer co-efficient______________?

A. Increases
B. Decreases
C. Is not affected
D. May increase or decrease; depends on the feed

In case of vertical tube evaporator, with increase in liquor level, the overall heat transfer co-efficient______________? Read More »

Chemical Heat Transfer

Shell side pressure drop in a shell and tube heat exchanger does not depend upon the_________________?

Chemical Heat Transfer /
Shell side pressure drop in a shell and tube heat exchanger does not depend upon the_________________?

A. Baffle spacing & shell diameter
B. Tube diameter & pitch
C. Viscosity, density & mass velocity of shell side fluid
D. None of these

Shell side pressure drop in a shell and tube heat exchanger does not depend upon the_________________? Read More »

Chemical Heat Transfer

Out of 100 kcal/second of incident radiant energy on the surface of a thermally transparent body, 300 kcal/second is reflected back. If the transmissivity of the body is 0.25, the emissivity of the surface will be_________________?

Chemical Heat Transfer /
Out of 100 kcal/second of incident radiant energy on the surface of a thermally transparent body, 300 kcal/second is reflected back. If the transmissivity of the body is 0.25, the emissivity of the surface will be_________________?

A. 0.35
B. 0.45
C. 0.55
D. 0.85

Out of 100 kcal/second of incident radiant energy on the surface of a thermally transparent body, 300 kcal/second is reflected back. If the transmissivity of the body is 0.25, the emissivity of the surface will be_________________? Read More »

Chemical Heat Transfer

The critical radius of insulation for a spherical shell is (where, K = thermal conductivity of insulating material h0 = heat transfer coefficient at the outer surface) ?

Chemical Heat Transfer /
The critical radius of insulation for a spherical shell is (where, K = thermal conductivity of insulating material h0 = heat transfer coefficient at the outer surface) ?

A. K/h0
B. 2K/h0
C. h0/K
D. h0/2K

The critical radius of insulation for a spherical shell is (where, K = thermal conductivity of insulating material h0 = heat transfer coefficient at the outer surface) ? Read More »

Chemical Heat Transfer

An evaporator while concentrating an aqueous solution from 10 to 40% solids evaporates 30000 kg of water. The amount of solids handled by the system in kg is___________________?

Chemical Heat Transfer /
An evaporator while concentrating an aqueous solution from 10 to 40% solids evaporates 30000 kg of water. The amount of solids handled by the system in kg is___________________?

A. 4000
B. 9000
C. 4600
D. 3000

An evaporator while concentrating an aqueous solution from 10 to 40% solids evaporates 30000 kg of water. The amount of solids handled by the system in kg is___________________? Read More »

Chemical Heat Transfer

Steady state one dimensional heat flow by conduction as given by Fourier’s low does not assume that_______________?

Chemical Heat Transfer /
Steady state one dimensional heat flow by conduction as given by Fourier’s low does not assume that_______________?

A. There is no internal heat generation
B. Boundary surfaces are isothermal
C. Material is anisotropic
D. Constant temperature gradient exists

Steady state one dimensional heat flow by conduction as given by Fourier’s low does not assume that_______________? Read More »

Chemical Heat Transfer