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Heat Transfer

Heat Transfer
Natural convection is characterised by

Reynolds number
Prandtl number
Grashhoff number
Peclet number

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Heat Transfer
The ratio of velocity head to tube side return loss in case of a multipass shell and tube heat exchanger is

2
4
43834
43832

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Heat Transfer
The left face of a one dimensional slab of thickness 0.2 m is maintained at 80°C and the right face is exposed to air at 30°C. The thermal conductivity of the slab is 1.2 W/m.K and the heat transfer co-efficient from the right face is 10 W/m².K. At steady state, the temperature of the right face in °C is

71.2
48.7
77.2
63.8

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Heat Transfer
In forced convection, the heat transfer depends on

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

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Heat Transfer
The interchange factor for radiation heat transfer from surface 'x' to surface 'y' in case of an infinite parallel planes with emis-sivities εx & εy is given by

Εx . εy
(εx + εy)/(εx + εy - εx . εy)
Εx + εy
1/εx + 1/εy

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

Prandtl
Nusselt
Grashoff
Stanton

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MORE MCQ ON Heat Transfer

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