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Heat Transfer

Heat Transfer
Steam economy in case of a triple effect evaporator will be

< 1
> 1
1
Between 0 and 1

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Heat Transfer
An evaporator while concentrating an aqueous solution from 10 to 40% solids evaporates 30000 kg of water. The amount of solids handled by the system in kg is

4000
3000
9000
4600

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Heat Transfer
Heat exchanger tubes are never made of

Plain carbon steel
Lead
Copper
Stainless steel

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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
85% magnesia cement and glass wool
Tar dolomite bricks followed by asbestos

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Heat Transfer
Open pan evaporators are preferred to be used, when the solution to be concentrated is

Corrosive
Salty
Scaling
Highly viscous

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Heat Transfer
At constant temperature, the thermal conductivities of gases __________ with rise in pressure.

Increase
May increase or decrease; depends on the pressure
Decrease
Remain unchanged

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