Heat Transfer - Study Mode
[#286] Viscosity of gases __________ with increase in temperature.
Correct Answer
(B) Increase slowly
[#287] The Sieder-Tate correlation for heat transfer in turbulent flow in pipe gives Nu α Re 0.8 , 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
Correct Answer
(B) (D) -0.2
[#288] According to Reynolds analogy, Stanton number is equal to (where, f = Fanning friction factor)
Correct Answer
(C) $$frac{{ ext{f}}}{2}$$
[#289] Vibrations in the tubes of a shell and tube heat exchanger is induced due to the
Correct Answer
(D) All of the above
[#290] Radiation heat losses from satisfactorily insulated high pressure boilar may be about __________ percent.
Correct Answer
(B) 7