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.Management Sciences
Category: Chemical Heat Transfer
The film thickness for laminar film condensation on vertical surface _____________ from top to bottom?
A. Cumulatively increases
B. Cumulatively decreases
C. Remain constant
D. And the surface conductance increase
Kg of liquid evaporated per hour in an evaporator is defined as its_________________?
A. Capacity
B. Economy
C. Steam load
D. None of these
For condensation of pure vapors, if the heat transfer co-efficients in filmwise and drop-wise condensation are respectively hf and hd, then__________________?
A. hf = hd
B. hf > hd
C. hf < hd
D. hf could be greater or smaller than hd
A body is called grey if the monochromatic emissivity of the body is___________________?
A. Zero
B. Unity
C. Same for all wavelengths
D. Different for all wavelengths
For a fluid flowing in an annulus space, the wetted perimeter for heat transfer and pressure drop are__________________?
A. Same
B. Different
C. Never different
D. Linearly related
What is the unit of thermal conductivity ?
A. Kcal/hr. m2 °C
B. Kcal/hr.m.°C
C. Kcal/hr.m
D. Kcal/hr. °C
In evaporators, lowering the feed temperature_______________?
A. Increases the heating area required
B. Reduces the economy
C. Both A. and B.
D. Decreases the heating area required
Which of the following is unimportant in forced convection ?
A. Reynolds number
B. Prandtl number
C. Grashoff number
D. None of these
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