Heat Transfer - Study Mode
[#141] For a fluid flowing in an annulus space, the wetted perimeter for heat transfer and pressure drop are
Correct Answer
(B) Different
[#142] Dietus-Boelter equation used for the determination of heat transfer co-efficient is valid
Correct Answer
(B) For fluids in tubulent flow
[#143] The outlet temperature of cooling water in a heat exchanger is generally not allowed to exceed above 50°C in industrial practice mainly to avoid
Correct Answer
(B) Excessive corrosion
[#144] The variation of thermal conductivity of a metal with temperature is often correlated using an expression of the form K = K 0 + at. where, K is the thermal conductivity and T is the temperature (in °K). The units of 'a' in SI system will be
Correct Answer
(C) W/m.K 2
[#145] The inside heat transfer co-efficient in case of turbulent flow of liquid in the tube side in a 1-2 shell and tube heat exchanger is increased by __________ times, when the number of tube passes is increased to 8.
Correct Answer
(B) 4 0.8