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Heat Transfer

Heat Transfer
While the total emissivity of a perfect black body is unity, the same for a real body is

>1
0
between 0 and 1
1

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Heat Transfer
Water is normally used as a coolant in the heat exchange equipments mainly because ofits

Low density
Low viscosity
Abundance & high heat capacity
High fluidity

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Heat Transfer
Dropwise condensation is promoted on a/an __________ surface.

Smooth
Coated
Glazed
Oily

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Heat Transfer
Fruit juice (a heat sensitive material) can be concentrated in a __________ evaporator.

None of these
High pressure
Long tube
Falling film

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Heat Transfer
A __________ evaporator employs an annular downtake.

None of these
Horizontal
Basket type
Long tube vertical

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Heat Transfer
A body cools down from 75°C to 70°C in 10 minutes. It will cool down from 70° C to 65° C in __________ minutes.

Either B or C, depends on the mass of the body
>10
10

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