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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
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
0.15
555
0.55

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Heat Transfer
In case of vertical tube evaporator, with increase in liquor level, the overall heat transfer co-efficient

Increases
May increase or decrease; depends on the feed
Is not affected
Decreases

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Heat Transfer
(NRe.NPr)(D/L) is called the __________ number

Peclet
Graetz
Stanton
None of these

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Heat Transfer
Radiator of an automobile engine is a __________ type of heat exchanger.

Direct contact
Counter-current
Cross-current
Co-current

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Heat Transfer
The unit of conductance in SI unit is

W/°K
W/m²
W/m
W/m°K

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