Heat Transfer MCQs

Nusselt number is a function of Prandtl number and __________ number of fluid in natural convection heat transfer.

In a heat exchanger with steam outside the tubes, a liquid gets heated to 45°C, when its flow velocity in the tubes is 2 m/s. If the flow velocity is reduced to 1 m/s, other things remaining the same, the temperature of the exit liquid will be

The left face of a one dimensional slab of thickness 0.2 m is maintained at 80°C and the right face is exposed to air at 30°C. The thermal conductivity of the slab is 1.2 W/m.K and the heat transfer co-efficient from the right face is 10 W/m2.K. At steady state, the temperature of the right face in °C is

Heat flux through several resistances in series in analogous to the current flowing through several

In forced convection, the Nusselt number is a function of

Minimum recommended baffle spacing in a shell and tube heat exchanger is about (where, D = shell diameter)

LMTD can't be used as such without a correction factor for the

Economy of an evaporator is influenced by the

In regenerative air preheater (as practised in heating of coke ovens), the heat is transferred