Heat Transfer MCQs

Condensing film co-efficient for steam on horizontal tubes ranges from 5000 to 15000 kcal/hr.m2.°C. Condensation of vapor is carried out inside the tube in a shell and tube heat exchanger, when the

If a single tube pass heat exchanger is converted to two pass, then for the same flow rate, the pressure drop per unit length in tube side will

The thermal radiation emitted by a body is proportional to Tn, where T is its absolute temperature. The value of 'n' is exactly 4 for

Convective heat transfer, in which heat is transferred by movement of warmed matter is described by

Viscosity of gases __________ with increase in temperature.

Thermal conductivity of a gas at low density, __________ with increase in temperature.

The Sieder-Tate correlation for heat transfer in turbulent flow in pipe gives Nu α Re0.8, where, Nu is the Nusselt number and Re is the Reynolds number for the flow. Assuming that this relation is valid, the heat transfer co-efficient varies with the pipe diameter (D) as

Pick out the wrong statement.

According to Reynolds analogy, Stanton number is equal to (where, f = Fanning friction factor)