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Heat Transfer

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
Fresh orange juice contains 12% (by weight) solids and the rest water 90% of the fresh juice is sent to an evaporator to remove water and subsequently mixed with the remaining 10% of fresh juice. The resultant product contains 40% solids. The kg of water removed from 1 kg fresh juice is

0.7
0.4
0.5
0.6

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Heat Transfer
Natural convection is characterised by

Prandtl number
Reynolds number
Grashhoff number
Peclet number

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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

77.2
63.8
48.7
71.2

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Heat Transfer
In a single evaporator system, the steam economy __________ by creating vacuum in the evaporator.

May increase or decrease, depends on the vacuum
Remains constant
Increases
Decreases

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Heat Transfer
A hot body will radiate heat most rapidly, if its surface is

Black & polished
Black & rough
White & rough
White & polished

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