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.Management Sciences
Category: Chemical Heat Transfer
In a shell and tube heat exchanger, putting a longitudinal baffle across the shell, forces the shell side fluid to pass _____________ through the heat exchanger ?
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A. Once
B. Twice
C. Thrice
D. Four times
Low thermal conductivity of heat insulating materials is due to its_________________?
A. Dense structure
B. High proportion of air space
C. High specific heat
D. None of these
In counter flow compared to parallel flow, ?
A. LMTD is greater
B. Less surface area is required for a given heat transfer rate
C. Both A. and B.
D. More surface area is required for a given heat transfer rate
Forced circulation evaporators are normally used for concentrating liquids having ___________________?
A. Scaling characteristics
B. High viscosity
C. Both A. & B.
D. Neither A. nor B.
The driving potential for the crystal growth during crystallisation is the _______________ of the solution?
A. Concentration
B. Viscosity
C. Super-saturation
D. Density
Nucleate boiling is promoted ___________________?
A. On polished surfaces
B. On rough surfaces
C. In the absence of agitation
D. None of these
The absorptivity of a grey body at a given temperature _____________ with increasing wavelength of radiation?
A. Increases
B. Decreases
C. Remain constant
D. May increase or decrease; depends on the material
While the total emissivity of a perfect black body is unity, the same for a real body is__________________?
A. 0
B. 1
C. > 1
D. Between 0 and 1
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