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Heat Transfer

Heat Transfer
For an ideal black body

Reflectivity = 1
Emissivity = 0
Transmissivity = 1
Absorptivity = 1

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Heat Transfer
Convective heat transfer co-efficient in case of fluid flowing in tubes is not affected by the tube length/diameter ratio, if the flow is in the __________ zone.

laminar
highly turbulent
transition
None of the listed here

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Heat Transfer
If heat transfer rate varies with the time, it is termed as

None of these
Monochromatic radiation
Forced convection
Steady state conduction

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Heat Transfer
Indirect contact heat exchangers are preferred over direct contact heat exchangers, because

There is no mist formation
There is no risk of contamination
Cost of equipment is lower
Heat transfer co-efficient are high

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Heat Transfer
An evaporator while concentrating an aqueous solution from 10 to 40% solids evaporates 30000 kg of water. The amount of solids handled by the system in kg is

9000
4600
4000
3000

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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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