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Heat Transfer

Heat Transfer
jH factor for heat transfer is not a function of the __________ number.

Both B & C
Nusselt
Grashoff
Reynolds

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Heat Transfer
A 2-4 heat exchanger involves

Smaller pressure drop compared to 1-2 exchanger
Only counter-flow of fluids
Only parallel-flow of fluids
Both counter and parallel-flow of the fluids

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Heat Transfer
Mode of heat transfer in which the fluid moves under the influence of changes in fluid pressure produced by external work is called

Forced convection
Radiation
Natural convection
Conduction

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Heat Transfer
The purpose of providing expansion bellows in the shell of tubular exchanger is to

Increase the heating load
Facilitate increase of shell length, if needed
Account for the uneven expansion of shell and tube bundles
Impart structural strength

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Heat Transfer
The units of resistance to heat transfer is

J.m⁻¹.K⁻¹
J.m⁻².K⁻¹
W.m⁻².K⁻¹
W⁻¹m²K

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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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