Heat Transfer
Radiator of an automobile engine is a __________ type of heat exchanger.

Cross-current
Co-current
Counter-current
Direct contact

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Heat Transfer
Prandtl number is the ratio of

Momentum diffusivity to mass diffusivity
Thermal diffusivity to mass diffusivity
Momentum diffusivity to thermal diffusivity
Thermal diffusivity to momentum diffusivity

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Heat Transfer
Vacuum is generally maintained in the vapour space of an evaporator mainly to

Facilitate forward feeding in multiple effect evaporation
Get economical temperature difference by using moderate pressure steam
Concentrate heat sensitive materials
Achieve very high concentration of the final product

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