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Heat Transfer

Heat Transfer
__________ heat exchanger is used for chilling oil to be dewaxed.

Floating head
U-tube
Double pipe
Fixed tube

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Heat Transfer
(Cp . μ)/K is termed as the __________ number.

Nusselt
Prandtl
Stanton
Grashoff

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Heat Transfer
In forced convection, the heat transfer depends on

none of the listed here
Re, Pr
mainly Gr
Re, Gr

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Heat Transfer
In a multipass shell and tube heat exchanger, tube side return pressure loss is equal to __________ the velocity head

square root of
four times
twice
none of the listed here

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Heat Transfer
Which of the following has the lowest overall heat transfer co-efficient?

Water
Air
Molten sodium
Dowtherm

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Heat Transfer
A composite wall consists of two plates A and B placed in series normal to the flow of heat. The thermal conductivities are kA and kB and the specific heat capacities are CPA and CPB for plates A and B respectively. Plate B has twice the thickness of plate A. At steady state, the temperature difference across plate A is greater than that across plate B, when

CPA < CPB
KA>2 kB
KA < 0.5kB
CPA > CPB

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