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Heat Transfer

Heat Transfer
A __________ evaporator employs an annular downtake.

Horizontal
None of these
Basket type
Long tube vertical

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Heat Transfer
A cube, sphere & a thin circular plate (all having same mass and made of same material) are all heated to 300°C and allowed to cool in natural air. Which one will cool the slowest ?

Cube
Sphere
All of these
Plate

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Heat Transfer
Thermal conductivities of most of the liquids __________ with rise in temperature.

May increase or decrease; depends on the liquid
Increases
Decreases
Remains unchanged

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Heat Transfer
When vaporisation takes place directly at the heating surface, it is called

all of the listed here
nucleate boiling
vapour binding
film boiling

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Heat Transfer
At what value of Prandtl number, the hydrodynamic and thermal boundary layers are identical?

1
1.5
0.5
80

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Heat Transfer
In a forward feed multiple effect evaporator, the pressure is

Same in all effects
Lowest in last effect
Highest in last effect
Dependent on the number of effects

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