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.Management Sciences
Category: Chemical Heat Transfer
For a multipass shell and tube heat exchanger, the LMTD correction factor is always________________?
0
A. 1
B. > 1
C. < 1
D. Between 1 & 2
In Biot number, the characteristic length used is the ratio of the _______________ of the solid?
A. Volume to surface area
B. Perimeter to surface area
C. Surface area to volume
D. Surface area to perimeter
When warm and cold liquids are mixed, the heat transfer is mainly by_______________?
A. Conduction
B. Convection
C. Radiation
D. Both A. & C.
In case of heat transfer by conduction in a hollow cylinder, ______________ mean area is used to calculate the heat transfer rate?
A. Geometric
B. Arithmetic
C. Logarithmic
D. Either A., B. or C.
Radiator of an automobile engine is a ______________ type of heat exchanger?
A. Co-current
B. Cross-current
C. Counter-current
D. Direct contact
With increase in temperature, the total emissivity of conductors____________________?
A. Increases
B. Decreases
C. Remain same
D. Decreases linearly
Crystallisation of solids from a homogeneous solution is a/an ______________ process?
A. Exothermic
B. Mildly endothermic
C. Highly endothermic
D. None of these
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