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Heat Transfer

Heat Transfer
The unit of conductance in SI unit is

W/m°K
W/m²
W/m
W/°K

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Heat Transfer
Steam side heat transfer co-efficient in an evaporator is in the range of __________ kcal/hr.m²°C.

100-500
18537
5000-15000
1000-1500

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Heat Transfer
With increase in the distance between the heat source and the object receiving the heat, the radiation heat transfer

Decreases
Increases
Remains unaffected
Increases exponentially

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

Boiling
Burnout
Nusselt
Leidenfrost

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Heat Transfer
For __________ Prandtl number values, the heat conduction will be negligible in the buffer zone.

Low
High
Extremely low
No

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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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