Heat Transfer - Study Mode
[#326] Heat transfer co-efficient equation for forced convection, Nu = 0.023 R e 0.8 . P r n , is not valid, if the value of
Correct Answer
(D) Reynolds number for the flow involved is < 2100
[#327] LMTD for evaporators & condensers for a given terminal parameters & set of conditions for counterflow is equal to that for parallel flow. In such heat exchangers, with one of the fluids condensing or evaporating, the surface area required is the least in the __________ flow.
Correct Answer
(D) Same in either A, B or C
[#328] In evaporators, lowering the feed temperature
Correct Answer
(C) Both A and B
[#329] Latent heat absorbed by 1 lb of water at 212°F, when it is changed to steam at 212°F, may be around __________ BTU.
Correct Answer
(A) 180
[#330] Sensible heat absorbed by 1 lb of water when it is heated from 32 to 212°F may be around __________ BTU.
Correct Answer
(A) 180