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

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

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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

0.5
0.7
0.6
0.4

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Heat Transfer
LMTD can't be used as such without a correction factor for the

Condensation of mixed vapour in a condenser
All of these
Multipass heat exchanger
Baffled heat exchanger

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Heat Transfer
In an extended surface heat exchanger, fluid having lower co-efficient

Can flow either inside or outside the tubes
Flows through the tube
Flows outside the tubes
Should not be used as it gives very high pressure drop

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Heat Transfer
Conduction occurs in the buffer zone for a fluid flowing through a heated pipe, only when Prandtl number is

>1
< 1
0.1
L

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MORE MCQ ON Heat Transfer

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