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Heat Transfer

Heat Transfer
Viscous & heat sensitive liquids are concentrated in __________ evaporators.

None of these
Long tube
Open pan
Agitated film

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Heat Transfer
The average heat transfer co-efficient over the entire length of the plate (ha) and the local heat transfer co-efficient (hL), in case of heat transfer over a flat plate in lminar zone is related as

Ha = 2hL
Ha= 5hL
Ha = 0.8hL
Ha = hL

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Heat Transfer
The inside heat transfer co-efficient in case of turbulent flow of liquid in the tube side in a 1-2 shell and tube heat exchanger is increased by __________ times, when the number of tube passes is increased to 8.

40.4
20.8
40.8
20.4

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

Saturated nucleate
Film
Sub-cooled
None of these

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Heat Transfer
In a shell and tube type heat exchanger, the floating tube bundle heat arrangement is used

Because of its low cost
In low range of temperature differences
To prevent corrosion of the tube bundles
In high range of temperature differences

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Heat Transfer
In a liquid-liquid heat exchanger, for the same process temperature, the ratio of the LMTD in parallel flow to the LMTD in counter flow is always

1
< 1
> 1
∞

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