Category: Chemical Heat Transfer

A. 1 kcal/hr.m.°C is equal to 1 BTU/hr. ft.°F
B. In steady state heat conduction, the only property of the substance which determines the temperature distribution, is the thermal conductivity
C. In unsteady state heat conduction, heat flows in the direction of temperature rise
D. In heat transfer by forced convection, Grashoff number is very important

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

A. Black painted bodies only
B. All bodies
C. Polished bodies only
D. A black body

A. Facilitate the cleaning of outer tube surface
B. Enhance turbulence
C. Hold the tubes in position
D. All A , B & C

A. Wall or skin friction
B. Form friction
C. Both A. and B.
D. Turbulent flow

A. Thermal boundary layer lies inside the concentration boundary layer
B. Concentration boundary layer lies inside the thermal boundary layer
C. Thermal & concentration boundary layers are of equal thickness
D. Hydrodynamic (i.e., momentum) boundary layer is thicker than the other two

A. Basket type
B. Horizontal tube
C. Short tube vertical
D. Long tube vertical

A. Boiling point
B. Dynamic viscosity
C. Kinematic viscosity
D. Density

A. D/5 and D
B. D/2 and 2 D
C. D/4 and 2 D
D. D and 2 D

A. Liquid depth over the heating surface
B. Solution being evaporated
C. Pressure difference between the steam chest and the vapor space above the boiling liquid
D. All A., B. and C.