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Heat Transfer

Heat Transfer
The ratio of velocity head to tube side return loss in case of a multipass shell and tube heat exchanger is

43832
2
4
43834

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Heat Transfer
Fouling factor for a heat exchanger is given by (where, U₁ = heat transfer co-efficient of dirty surface U₂ = heat transfer co-efficient of clean surface)

U₁ - U₂
1/U₂ - 1/U₁
1/U₁ - 1/U₂
U₂ - U₁

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Heat Transfer
In a heat exchanger with steam outside the tubes, a liquid gets heated to 45°C, when its flow velocity in the tubes is 2 m/s. If the flow velocity is reduced to 1 m/s, other things remaining the same, the temperature of the exit liquid will be

Less than 45°C
More than 45°C
Equal to 45°C
Initially decreases and remains constant thereafter

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Heat Transfer
A body is called grey if the monochromatic emissivity of the body is

Same for all wavelengths
Zero
Unity
Different for all wavelengths

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Heat Transfer
The film thickness for laminar film condensation on vertical surface __________ from top to bottom.

Remains constant
Cummulatively increases
Cummulatively decreases
And the surface conductance increase

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Heat Transfer
Circulation pump is located below the evaporater to

Avoid cavitation
Create more suction head
None of these
Avoid frequent priming

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