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Heat Transfer

Heat Transfer
Boiling of milk in an open vessel is an example of __________ boiling.

Film
Sub-cooled
Saturated nucleate
None of these

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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

55.5
0.55
0.15
555

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Heat Transfer
Which of the following is correct ?

Rate = Driving force x Resistance
Driving force = Rate x Resistance
Rate = Resistance/Driving force
Resistance = Driving force x Rate

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Heat Transfer
While the total emissivity of a perfect black body is unity, the same for a real body is

0
between 0 and 1
1
>1

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Heat Transfer
For evaporation of viscous solution in a multiple effect evaporator, the prefered feeding scheme is

Forward
Backward
Parallel
None of these

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Heat Transfer
Temperature profile in steady state heat transfer is

parabolic
none of the listed here
hyperbolic
Linear

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