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March 2019

In a shell and tube heat exchanger, the tube side heat transfer co-efficient just at the entrance of the tube is_________________?

Chemical Heat Transfer /
In a shell and tube heat exchanger, the tube side heat transfer co-efficient just at the entrance of the tube is_________________?

A. Infinity
B. Zero
C. Same as average heat transfer co-efficient for tube side
D. None of these

In a shell and tube heat exchanger, the tube side heat transfer co-efficient just at the entrance of the tube is_________________? Read More »

Chemical Heat Transfer

Which of the following is the most controlling factor for the rate of bubble detachment from the hot solid surface ?

Chemical Heat Transfer /
Which of the following is the most controlling factor for the rate of bubble detachment from the hot solid surface ?

A. Liquid density
B. Liquid viscosity
C. Hot surface temperature
D. Interfacial tension

Which of the following is the most controlling factor for the rate of bubble detachment from the hot solid surface ? Read More »

Chemical Heat Transfer

If all the conditions and dimensions are same, then the ratio of velocity through the tubes of a double pass heat exchanger to that through the single pass heat exchanger is_________________?

Chemical Heat Transfer /
If all the conditions and dimensions are same, then the ratio of velocity through the tubes of a double pass heat exchanger to that through the single pass heat exchanger is_________________?

A. 1
B. 2
C. 1/2
D. 4

If all the conditions and dimensions are same, then the ratio of velocity through the tubes of a double pass heat exchanger to that through the single pass heat exchanger is_________________? Read More »

Chemical Heat Transfer

A long iron rod initially at a temperature of 20°C has one end dipped in boiling water (100°C) at time, t = 0. The curved surface of the rod is insulated so that heat conduction is one dimensional in the axial direction. The temperature at a distance 100 mm from the dipped end becomes 40°C at time, t = 200 s. The same temperature is achieved at a distance of 200 mm from the dipped end at time ___________________?

Chemical Heat Transfer /
A long iron rod initially at a temperature of 20°C has one end dipped in boiling water (100°C) at time, t = 0. The curved surface of the rod is insulated so that heat conduction is one dimensional in the axial direction. The temperature at a distance 100 mm from the dipped end becomes 40°C at time, t = 200 s. The same temperature is achieved at a distance of 200 mm from the dipped end at time ___________________?

A. t = 283 s
B. t = 356 s
C. t = 400 s
D. t = 800 s

A long iron rod initially at a temperature of 20°C has one end dipped in boiling water (100°C) at time, t = 0. The curved surface of the rod is insulated so that heat conduction is one dimensional in the axial direction. The temperature at a distance 100 mm from the dipped end becomes 40°C at time, t = 200 s. The same temperature is achieved at a distance of 200 mm from the dipped end at time ___________________? Read More »

Chemical Heat Transfer