Heat Transfer
Dietus-Boelter equation used for the determination of heat transfer co-efficient is valid

for fluids in tubulent flow
none of the listed here
when Grashhoff number is very important
for fluids in laminar flow

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Heat Transfer
Nusselt number is the ratio of the

Heat flux at the wall to that across the entire pipe
Temperature gradient of the wall to that across the entire pipe
Temperature difference to the temperature gradient at the wall
None of these

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Heat Transfer
LMTD for counterflow and prallel flow heat exchanger will be the same, when the

Cold fluid is heated to a certain temperature by condensing steam (isothermal fluid)
None of these
Outlent temperature of both the hot and cold fluid are same
Outlet temperature of hot fluid is less than the outlet temperature of the cold fluid

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