A. Double pipe heat exchanger
B. Multipass shell and tube heat exchanger
C. Fouling fluids
D. Counter flow of hot and cold fluids
A. Same as that for fluid flow
B. Less than that for fluid flow
C. More than that for fluid flow
D. D2 – D1 (D1 and D2 are I.D. of inner and outer pipes respectively)
A. Density of the gas, but is independent of the viscosity of the gas
B. Density of the gas and inversely as viscosity of the gas
C. Viscosity of the gas and inversely as density of the gas
D. None of these
A. Reducing scale deposition
B. Increasing pressure drop
C. Fixing the tubes
D. Creating turbulence
A. d1/(d1 + d2)
B. d2/(d1 + d2)
C. (d1 + d2)/d1
D. (d1 + d2)/d2
A. Is economical in operation
B. Employs high velocity, high heat transfer rate and less heating surface requirement
C. Employs a centrifugal pump placed between external downtake from vapor drum and inlet to
tube bundle
D. Both B. & C.
A. Keep a check on the liquid gradient over the plate by direct visual observation
B. Give access to the individual trays for cleaning, maintenance and installation
C. Guard against foaming & entrainment by dumg antifoaming agent through it
D. All A., B. and C.