- (A) Constant overall heat transfer co-efficient.
- (B) Constant rate of fluid flow
- (C) Constant specific heat
- (D) No partial phase change in the system
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- (A) (r1 – r2)/ln(r1/r2)
- (B) (r1 – r2)/ln(r2/r1)
- (C) (r2 – r1)/ln(r1/r2)
- (D) (r1 – r2)/-ln(r1/r2)
- (A) 2.36
- (B) 4.36
- (C) 120.36
- (D) Dependent on NRe only
- (A) Average
- (B) Geometric mean
- (C) Product
- (D) Sum
- (A) n = 0.4 is used for heating
- (B) n = 0.3 is used for cooling
- (C) Reynolds number for the flow involved is > 10000
- (D) Reynolds number for the flow involved is < 2100
- (A) 40
- (B) 95
- (C) 70
- (D) 50
- (A) Black painted bodies only
- (B) All bodies
- (C) Polished bodies only
- (D) A black body
- (A) Rate of heat transfer
- (B) Flow velocity
- (C) Turbulence of shell side fluid
- (D) All
- (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) Conduction
- (B) Natural convection
- (C) Forced convection
- (D) Radiation
