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March 2019

Terminal point temperature differences between fluids in case of a heat exchanger is termed as__________________?

Chemical Heat Transfer /
Terminal point temperature differences between fluids in case of a heat exchanger is termed as__________________?

A. Approach
B. Log mean temperature difference
C. Arithmetic mean temperature difference
D. Geometric mean temperature difference

Terminal point temperature differences between fluids in case of a heat exchanger is termed as__________________? Read More »

Chemical Heat Transfer

A composite wall consists of two plates A and B placed in series normal to the flow of heat. The thermal conductivities are kA and kB and the specific heat capacities are CPA and CPB for plates A and B respectively. Plate B has twice the thickness of plate A. At steady state, the temperature difference across plate A is greater than that across plate B, when_________________?

Chemical Heat Transfer /
A composite wall consists of two plates A and B placed in series normal to the flow of heat. The thermal conductivities are kA and kB and the specific heat capacities are CPA and CPB for plates A and B respectively. Plate B has twice the thickness of plate A. At steady state, the temperature difference across plate A is greater than that across plate B, when_________________?

A. CPA > CPB
B. CPA < CPB
C. kA < 0.5 kB
D. kA >2 kB

A composite wall consists of two plates A and B placed in series normal to the flow of heat. The thermal conductivities are kA and kB and the specific heat capacities are CPA and CPB for plates A and B respectively. Plate B has twice the thickness of plate A. At steady state, the temperature difference across plate A is greater than that across plate B, when_________________? Read More »

Chemical Heat Transfer

Overall heat transfer co-efficient of a particular tube is U1. If the same tube with some dirt deposited on either side has coefficient U2, then_________________?

Chemical Heat Transfer /
Overall heat transfer co-efficient of a particular tube is U1. If the same tube with some dirt deposited on either side has coefficient U2, then_________________?

A. U1 = U2
B. U2 > U1
C. U1 > U2
D. U1 = dirt factor – U2

Overall heat transfer co-efficient of a particular tube is U1. If the same tube with some dirt deposited on either side has coefficient U2, then_________________? Read More »

Chemical Heat Transfer

In a shell and tube type heat exchanger, the floating tube bundle heat arrangement is used________________?

Chemical Heat Transfer /
In a shell and tube type heat exchanger, the floating tube bundle heat arrangement is used________________?

A. In low range of temperature differences
B. In high range of temperature differences
C. Because of its low cost
D. To prevent corrosion of the tube bundles

In a shell and tube type heat exchanger, the floating tube bundle heat arrangement is used________________? Read More »

Chemical Heat Transfer

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

Chemical Heat Transfer /
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.

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

Chemical Heat Transfer