Thickness of thermal boundary layer is more compared to that of hydrodynamic boundary layer, when the value of Prandtl number is_________________?

A. > 0.75
B. < 0.75
C. < 0.50
D. < 0.25

A. Nusselt number
B. Sherwood number
C. Schmidt number
D. Stanton number

A. Reynolds number
B. Prandtl number
C. Grashoff number
D. None of these

A. Total heat transfer area of all the effects is -less than that in a single effect evaporator system
B. Total amount of vapor produced per Kg of feed steam in a multiple effect system is much
higher than in a single effect
C. Boiling point elevation in a single effect system is much higher than that in any effect in a
multi-effect system
D. Heat transfer co-efficient in a single effect is much lower than that in any effect in a multieffect
system

A. Eddies current
B. Conduction
C. Convection
D. None of these

A. Gives a higher shell side pressure drop
B. Gives a lower shell side pressure drop
C. Can pack more surface area into a shell of given diameter
D. None of these