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Heat Transfer

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

Glazed
Smooth
Oily
Coated

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Heat Transfer
Heat transfer by conduction in the turbulent core of a fluid flowing through a heated pipe is negligible, if the value of Prandtl number is

0.2
0.6
0.8
0.4

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Heat Transfer
Which of the following has the highest thermal conductivity ?

Black
Water
Silver
Air

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Heat Transfer
In a backward feed multiple effect evaporator

Feed is introduced in the first effect
No pumps are required between successive effects
None of these
Feed flows from low pressure to high pressure

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Heat Transfer
Heat waves

Can be reflected by a mirror
Can not pass through vacuum
Travel in straight line
Both B and C

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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

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

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