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Heat Transfer

Heat Transfer
What is the steam economy in case of a single effect evaporator system?

0.1
< 1
>1
1

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Heat Transfer
Convective heat transfer co-efficient in case of fluid flowing in tubes is not affected by the tube length/diameter ratio, if the flow is in the __________ zone.

None of the listed here
laminar
transition
highly turbulent

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Heat Transfer
A metal wire of 0.01 m dia and thermal conductivity 200 W/m.K is exposed to a fluid stream with a convective heat transfer coefficient of 100 W/m².K. The Biot number is

0.0035
5.6
3.5
0.025

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Heat Transfer
For flow over a flat plate, the ratio of thermal boundary layer thickness, 'xt' and hydrodynamic boundary layer thickness 'x' is equal to (where, NPr = Prandtl number)

NPr-1
NPr
NPr-1/3
NPr1/3

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Heat Transfer
Heat flux, as defined in heat flow is analogous to __________ in electricity flow.

Voltage
Resistance
Current
None of these

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Heat Transfer
In case of __________ boiling, the bubbles formed on a submerged hot surface get absorbed in the mass of the liquid.

None of these
Pool
Low pressure
Nucleate

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