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Heat Transfer

Heat Transfer
__________ chart is known as transient heat conduction chart.

Dirhing's
Heisler's
Cox
Mollier's

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Heat Transfer
Choose the correct equation.

Nu = (Pr)(St)
Nu = (Re) (Pr) (St)
Nu = (Re) (Pr) (Gz)
Nu = (Re)(Pr)

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Heat Transfer
In a co-current double pipe heat exchanger used for condensing saturated steam over the inner tube, if the entrance and exit conditions of the coolant are interchanged, then the rate of condensation will

Decrease
Remain unchanged
Increase
Either increase or decrease; depends on the coolant flow rate

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Heat Transfer
A metal wire of 0.01 m dia and thermal conductivity 200 W/m.K is exposed to a fluid stream with a convective heat transfer coefficient of 100 W/m².K. The Biot number is

0.025
3.5
0.0035
5.6

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Heat Transfer
Which of the following is unimportant in forced convection ?

Reynolds number
none of the listed here
Grashhoff number
Prandtl number

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Heat Transfer
A sphere of radius 'R₁' is enclosed in a sphere of radius 'R₂'. The view (or shape) factor for radiative heat transfer of the outer sphere with respect to the inner sphere is

R₂/(R₁+R₂)
(R₁/R₂)2
1

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