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Heat Transfer

Heat Transfer
The range of electromagnetic spectrum important in heat transfer by radiation is __________ microns.

0.5-50
5-50
100-1000
0.38-0.78

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Heat Transfer
With increase in temperature, the thermal conductivity of non-metallic amorphous solids

remains same
None of the listed here
increases
decreases

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Heat Transfer
Which of the following is the most widely used heat insulating material for pipelines carrying steam?

Fireclay refractory followed by aluminium sheet
Cotton followed by aluminium foil
Tar dolomite bricks followed by asbestos
85% magnesia cement and glass wool

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Heat Transfer
In a forward feed multiple effect, the pressure build up will be

least at the inlet of the first effect
highest at the outlet of the last effect
least at the outlet of the last effect
highest at the inlet of the last effect

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

Falling film
High pressure
Long tube
None of these

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Heat Transfer
Which is the most suitable for cold viscous feed?

Mixed feed
Forward feed
Parallel feed
Backward feed

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