A. Same velocity profile or equal eddy diffusivities
B. Thermal or pressure mass diffusion
C. Viscous heating or chemical reaction
D. Both B. and C.
A. Temperature gradient
B. Mechanical strength of the equipment
C. Heat transfer area
D. Heat transfer co-efficient
A. A red hot steel slab (having outside surface temperature as 1300°C) exposed to the
atmospheric air at 35°C
B. 10 kg of dry saturated steam at 8 kgf/cm2 flowing through a short length of stainless steel pipe
exposed to atmospheric air at 35°C
C. Boiling brine kept in open vessel when the bottom surface temperature of the vessel is
maintained constant at 180°C
D. A sub-cooled refrigerant liquid at 8°C flowing at the rate of 6 Kg/minute through a copper
pipe exposed to atmospheric air at 35°C
A. Stefan-Boltzmann’s
B. Planck’s
C. Wien’s displacement
D. None of these
A. On polished surfaces
B. On rough surfaces
C. In the absence of agitation
D. None of these
A. When heat transfer area required is very high
B. When heat transfer area required is very low, i.e. (100-200 ft2).
C. Because it occupies less floor area
D. Because it is less costly
A. Basket type
B. Horizontal tube
C. Calandria
D. None of these