Chemical Heat Transfer Archives

Arithmetic mean area can be used in heat transfer problem to calculate the heat flow by conduction through a cylinder which is ____________________?

Arithmetic mean area can be used in heat transfer problem to calculate the heat flow by conduction through a cylinder which is ____________________?

A. Thin walled having the value of Ao Ai/< 2
B. Thick walled
C. Having the value of Ao/Ai > 2
D. Both B. and C.

Arithmetic mean area can be used in heat transfer problem to calculate the heat flow by conduction through a cylinder which is ____________________? Read More »

Chemical Heat Transfer

jH factor for heat transfer is not a function of the _______________ number?

Chemical Heat Transfer / admin

jH factor for heat transfer is not a function of the _______________ number?

A. Reynolds
B. Nusselt
C. Grashoff
D. Both B. & C.

jH factor for heat transfer is not a function of the _______________ number? Read More »

Chemical Heat Transfer

In a heat exchanger, one transfer unit means___________________?

Chemical Heat Transfer / admin

In a heat exchanger, one transfer unit means___________________?

A. A section of the exchanger in which change in temperature of one stream equals the average
driving force in the section
B. The size of the exchanger in which heat transfer rate is 1 kcal/hr
C. Both A. and B.
D. None of these

In a heat exchanger, one transfer unit means___________________? Read More »

Chemical Heat Transfer

A 2-4 heat exchanger involves__________________?

Chemical Heat Transfer / admin

A 2-4 heat exchanger involves__________________?

A. Only counter-flow of fluids
B. Only parallel-flow of fluids
C. Both counter and parallel-flow of the fluids
D. Smaller pressure drop compared to 1-2 exchanger

A 2-4 heat exchanger involves__________________? Read More »

Chemical Heat Transfer

In a shell and tube heat exchanger, the height of 25 percent cut baffles is equal to (where, D = inside diameter of shell) ?

Chemical Heat Transfer / admin

In a shell and tube heat exchanger, the height of 25 percent cut baffles is equal to (where, D = inside diameter of shell) ?

A. 0.25 D
B. 0.50 D
C. 0.75 D
D. None of these

In a shell and tube heat exchanger, the height of 25 percent cut baffles is equal to (where, D = inside diameter of shell) ? Read More »

Chemical Heat Transfer

Latent heat absorbed by 1 lb of water at 212°F, when it is changed to steam at 212°F, may be around ______________ BTU?

Chemical Heat Transfer / admin

Latent heat absorbed by 1 lb of water at 212°F, when it is changed to steam at 212°F, may be around ______________ BTU?

A. 180
B. 970
C. 3.97
D. None of these

Latent heat absorbed by 1 lb of water at 212°F, when it is changed to steam at 212°F, may be around ______________ BTU? Read More »

Chemical Heat Transfer

Baffle spacing ____________________?

Chemical Heat Transfer / admin

Baffle spacing ____________________?

A. Is not the same as baffle pitch
B. Should be less than one fifth the diameter of the shell
C. Should be less than the inside diameter of the shell
D. None of these

Baffle spacing ____________________? Read More »

Chemical Heat Transfer