When does the heat generated by fluid friction becomes appreciable compared to the heat transferred between the fluids ?

A. Increases the rate of condensation
B. Decreases thermal resistance
C. Is desirable to increase the film co-efficient
D. None of these

A. High viscosity
B. High co-efficient of thermal expansion
C. Low temperature gradients
D. Low density change with temperature

A. Rate of heat transfer
B. Degree of turbulence
C. Degree of super-saturation
D. All A., B. and C

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

A. 180
B. 970
C. 3.97
D. Data insufficient, can’t be predicted

A. Increases
B. Decreases
C. Remains unchanged
D. May increase or decrease; depending on temperature