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.Management Sciences
Category: Chemical Heat Transfer
Fqra cold viscous feed, backward feed gives _____________ than forward feed?
A. A higher capacity
B. A lower capacity
C. Lower economy
D. None of these
The Nusselt number for fully developed (both thermally and hydrodynamically) laminar flow through a circular pipe, where the wall heat flux is constant, is__________________?
A. 2.36
B. 4.36
C. 120.36
D. Dependent on NRe only
According to Reynolds analogy, Stanton number is equal to (where, f = Fanning friction factor) ?
A. 2f
B. f
C. f/2
D. f/4
Leidenfrost point is a term concerned with the____________________?
A. Condensation of the saturated vapor on a cold surface
B. Concentration of a corrosive solution by evaporation
C. Heat transfer between two highly viscous liquids
D. Boiling of a liquid on a hot surface
Steam trap is used to_________________?
A. Condense the steam flowing in the pipeline
B. Remove water resulting from partial condensation of steam
C. Stop the supply of steam
D. None of these
Fouling factor for a heat exchanger is given by (where, U1 = heat transfer co-efficient of dirty surface U2 = heat transfer co-efficient of clean surface) ?
A. U1 – U2
B. 1/U1 – 1/U2
C. 1/U2 – 1/U1
D. U2 – U1
‘Duhring’s plot’ is of use in_________________?
A. Extractive distillation
B. Evaporation
C. Leaching
D. Absorption
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