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March 2019

The rate of heat transfer through a pipe wall is given by, q = 2π k (Ti – T0)/ln (ri/r0). For cylinder of very thin wall, q can be approximated by__________________?

Chemical Heat Transfer /
The rate of heat transfer through a pipe wall is given by, q = 2π k (Ti – T0)/ln (ri/r0). For cylinder of very thin wall, q can be approximated by__________________?

A. q = [2π k (Ti + T0)/2]/ln (ri/r0)
B. q = 2π ri k (Ti – T0)/(r0/ri)
C. q = 2π k (Ti – T0)/(r0/ri)
D. q = 2π k (Ti – T0)/[(r0 + ri)/2]

The rate of heat transfer through a pipe wall is given by, q = 2π k (Ti – T0)/ln (ri/r0). For cylinder of very thin wall, q can be approximated by__________________? Read More »

Chemical Heat Transfer

If a single tube pass heat exchanger is converted to two pass, then for the same flow rate, the pressure drop per unit length in tube side will ________________?

Chemical Heat Transfer /
If a single tube pass heat exchanger is converted to two pass, then for the same flow rate, the pressure drop per unit length in tube side will ________________?

A. Increase by 1.8 times
B. Decrease by 22
C. Increase by 216
D. Remain unchanged

If a single tube pass heat exchanger is converted to two pass, then for the same flow rate, the pressure drop per unit length in tube side will ________________? Read More »

Chemical Heat Transfer

A measure of the extent to which viscous heating is important relative to the heat flow resulting from the impressed temperature difference is represented by the _______________ number?

Chemical Heat Transfer /
A measure of the extent to which viscous heating is important relative to the heat flow resulting from the impressed temperature difference is represented by the _______________ number?

A. Condensation
B. Grashoff
C. Stanton
D. Brinkman

A measure of the extent to which viscous heating is important relative to the heat flow resulting from the impressed temperature difference is represented by the _______________ number? Read More »

Chemical Heat Transfer

Heat transfer efficiency leading of energy conservation in a heat exchanger can be achieved by____________________?

Chemical Heat Transfer /
Heat transfer efficiency leading of energy conservation in a heat exchanger can be achieved by____________________?

A. Keeg the heat transfer surface clean
B. Enhancing the fluid pumg rate
C. Increasing the tube length
D. None of these

Heat transfer efficiency leading of energy conservation in a heat exchanger can be achieved by____________________? Read More »

Chemical Heat Transfer

A hot liquid is kept in a big room. The logarithm of the numerical value of the temperature difference between the liquid and the room is plotted against time. The plot will be very nearly a/an___________________?

Chemical Heat Transfer /
A hot liquid is kept in a big room. The logarithm of the numerical value of the temperature difference between the liquid and the room is plotted against time. The plot will be very nearly a/an___________________?

A. Ellipse
B. Straight line
C. Parabola
D. Circular arc

A hot liquid is kept in a big room. The logarithm of the numerical value of the temperature difference between the liquid and the room is plotted against time. The plot will be very nearly a/an___________________? Read More »

Chemical Heat Transfer