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Heat Transfer

Heat Transfer
Electromagnetic radiations propagate in vacuum with a velocity of __________ metre/second.

3 x l010
3 x l012
3 x l05
3 x l08

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Heat Transfer
In forced convection, the heat transfer depends on

none of the listed here
mainly Gr
Re, Gr
Re, Pr

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Heat Transfer
With increase in temperature, the total emissivity of conductors

Decreases linearly
Remains same
Increases
Decreases

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Heat Transfer
The main purpose of providing fins on heat transfer surface is to increase the

Temperature gradient
Heat transfer co-efficient
Mechanical strength of the equipment
Heat transfer area

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Heat Transfer
Heat exchanger tubes are never made of

Copper
Plain carbon steel
Stainless steel
Lead

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

Same for all wavelengths
Unity
Zero
Different for all wavelengths

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