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Heat Transfer

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

Salty
Scaling
Corrosive
Highly viscous

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Heat Transfer
Which of the following accessories is provided in the vapor line of an evaporator for removing the entrained liquid?

Catchall
Vent
Bleed point
Baffle

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Heat Transfer
Prandtl number is the reciprocal of

Thermal diffusivity/Momentum diffusivity
Thermal diffusivity x Mass diffusivity
Thermal diffusivity x Momentum
Mass diffusivity x Momentum diffusivity

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Heat Transfer
In case of a vertical tube evaporator, with increase in the liquor level, the

Capacity of the evaporator is increased
True temperature drop increases
Capacity of the evaporator is decreased
Both B and C

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Heat Transfer
Three solid objects of the same material and of equal mass-a sphere, a cylinder (length = diameter) and a cube are at 500°C initially. These are dropped in a quenching bath containing a large volume of cooling oil each attaining the bath temperature eventually. The time required for 90% change in temperature is the smallest for

Sphere
Cylinder
Cube
Equal for all the three

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Heat Transfer
In a boiling curve, the peak heat flux is called the __________ point.

Nusselt
Leidenfrost
Boiling
Burnout

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