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March 2019

For small temperature difference, the heat transfer rate as per Newton’s law of cooling is proportional to (where, Δt = excess temperature) ?

Chemical Heat Transfer /
For small temperature difference, the heat transfer rate as per Newton’s law of cooling is proportional to (where, Δt = excess temperature) ?

A. Δt
B. Δt2
C. Δt3
D. √(Δt)

For small temperature difference, the heat transfer rate as per Newton’s law of cooling is proportional to (where, Δt = excess temperature) ? Read More »

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