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Heat Transfer

Heat Transfer
Open pan evaporators are preferred to be used, when the solution to be concentrated is

Scaling
Salty
Highly viscous
Corrosive

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Heat Transfer
Value of Nusselt number [Nu = (hD/k)] for the heat transfer by conduction from a droplet or a spherical particle to a surrounding stagnant film is

10
0.5
100
2

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Heat Transfer
Which of the following has the minimum absorptivity?

Iron plates
Coal dust
Refractory bricks
Aluminium foil

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Heat Transfer
The critical radius 'r' of insulation on a pipe is given by

r = k/2h
r = h/k
r = k/h
r = 2k/h

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Heat Transfer
jH factor for heat transfer depends upon the __________ number.

Biot
Nusselt
Prandtl
Reynolds

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Heat Transfer
A metal ball of radius 0.1 m at a uniform temperature of 90°C is left in air at 30°C. The density and the specific heat of the metal are 3000 kg/m³ and 0.4 kJ/kg.K respectively. The heat transfer co-efficient is 50 W/m².K Neglecting the temperature gradients inside the ball, the time taken (in hours) for the ball to cool to 60°C is

555
55.5
0.55
0.15

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