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March 2019

The actual temperature drop across the heating surface of an evaporator depends on the_______________?

Chemical Heat Transfer /
The actual temperature drop across the heating surface of an evaporator depends on the_______________?

A. Liquid depth over the heating surface
B. Solution being evaporated
C. Pressure difference between the steam chest and the vapor space above the boiling liquid
D. All A., B. and C.

The actual temperature drop across the heating surface of an evaporator depends on the_______________? Read More »

Chemical Heat Transfer

Heat transfer by conduction in the turbulent core of a fluid flowing through a heated pipe is negligible, if the value of Prandtl number is_______________?

Chemical Heat Transfer /
Heat transfer by conduction in the turbulent core of a fluid flowing through a heated pipe is negligible, if the value of Prandtl number is_______________?

A. 0.2
B. 0.4
C. 0.6
D. 0.8

Heat transfer by conduction in the turbulent core of a fluid flowing through a heated pipe is negligible, if the value of Prandtl number is_______________? Read More »

Chemical Heat Transfer

Indirect contact heat exchangers are preferred over direct contact heat exchangers, because_________________?

Chemical Heat Transfer /
Indirect contact heat exchangers are preferred over direct contact heat exchangers, because_________________?

A. Heat transfer co-efficient are high
B. There is no risk of contamination
C. There is no mist formation
D. Cost of equipment is lower

Indirect contact heat exchangers are preferred over direct contact heat exchangers, because_________________? Read More »

Chemical Heat Transfer

Forced circulation evaporators are useful for the concentration of viscous, salting and scale forming liquors. Which of the following is a forced circulation evaporator ?

Chemical Heat Transfer /
Forced circulation evaporators are useful for the concentration of viscous, salting and scale forming liquors. Which of the following is a forced circulation evaporator ?

A. Long vertical evaporator
B. Horizontal tube evaporator
C. Agitated film evaporator
D. Calandria vertical tube evaporator

Forced circulation evaporators are useful for the concentration of viscous, salting and scale forming liquors. Which of the following is a forced circulation evaporator ? Read More »

Chemical Heat Transfer

In case of heat transfer by conduction in a hollow cylinder, ______________ mean area is used to calculate the heat transfer rate?

Chemical Heat Transfer /
In case of heat transfer by conduction in a hollow cylinder, ______________ mean area is used to calculate the heat transfer rate?

A. Geometric
B. Arithmetic
C. Logarithmic
D. Either A., B. or C.

In case of heat transfer by conduction in a hollow cylinder, ______________ mean area is used to calculate the heat transfer rate? Read More »

Chemical Heat Transfer

One kilogram of water at 0°C is changed to superheated steam of one atm pressure and 300° C. The major heat consumption in the process will be to________________?

Chemical Heat Transfer /
One kilogram of water at 0°C is changed to superheated steam of one atm pressure and 300° C. The major heat consumption in the process will be to________________?

A. Heat the water from 0°C to 100°C
B. Evaporate the water
C. To superheat the steam
D. Data insufficient, can’t be predicted

One kilogram of water at 0°C is changed to superheated steam of one atm pressure and 300° C. The major heat consumption in the process will be to________________? Read More »

Chemical Heat Transfer