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Heat Transfer

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

Leidenfrost
Nusselt
Boiling
Burnout

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Heat Transfer
Steam condensate is recovered by steam traps and recycled for use as boiler feed water, because of its low

Suspended solids content
Hardness
All of these
Dissolved soilds content

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

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

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Heat Transfer
A composite wall consists of two plates A and B placed in series normal to the flow of heat. The thermal conductivities are kA and kB and the specific heat capacities are CPA and CPB for plates A and B respectively. Plate B has twice the thickness of plate A. At steady state, the temperature difference across plate A is greater than that across plate B, when

CPA < CPB
KA < 0.5kB
CPA > CPB
KA>2 kB

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Heat Transfer
Natural convection is characterised by

Reynolds number
Grashhoff number
Peclet number
Prandtl number

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Heat Transfer
The Graetz number is concerned with the

heat transfer in turbulent flow
absorption with chemical reaction
mass transfer between a gas and a liquid
heat transfer in laminar flow

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