Heat Transfer MCQs

All analogy equations connecting friction factor and heat transfer co-efficient apply only to

The unit of heat transfer co-efficient in SI unit is

The main purpose of providing fins on heat transfer surface is to increase the

Hot water (0.01 m3/min) enters the tube side of a counter current shell and tube heat exchanger at 80°C and leaves at 50°C. Cold oil (0.05 m3/min) of density 800 kg/m3 and specific heat of 2 kJ/kg.K enters at 20°C. The log mean temperature difference in °C is approximately

The rate of heat transfer is a product of overall heat transfer co-efficient, the difference in temperature and the

Multiple effect evaporation accounts for

The critical radius of insulation for a spherical shell is (where, K = thermal conductivity of insulating material h0 = heat transfer coefficient at the outer surface)

Finned tube heat exchangers

For an ideal black body