Chemical Heat Transfer

A. On polished surfaces
B. On rough surfaces
C. In the absence of agitation
D. None of these

A. 0.5
B. < 0.5
C. > 0.6
D. < 0.1

A. 1200 W/m2.K
B. 894 W/m2.K
C. 333 W/m2.K
D. 287 W/m2.K

A. Grashoff
B. Nusselt
C. Prandtl
D. Stanton

A. Increases
B. Decreases
C. Remain constant
D. May increase or decrease, depends on the vacuum

A. More
B. Less
C. Same
D. More or less; depends on the nature of solution

A. Laminar
B. Turbulent
C. Creeping
D. Transition region

A. t
B. 1/ρ
C. 1/A
D. All A., B. & C.

A. Large temperature differentials
B. High heat transfer co-efficient
C. Low pressure drop
D. Less corrosion of tubes

A. For fluids in laminar flow
B. For fluids in turbulent flow
C. When Grashoff number is very important
D. For liquid metals