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Heat Transfer

Heat Transfer
Value of Prandtl number for water ranges from

100 to 500
5 to 10
L to 2
1000 to 2000

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Heat Transfer
In a backward feed multiple effect evaporator

Feed is introduced in the first effect
Feed flows from low pressure to high pressure
None of these
No pumps are required between successive effects

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Heat Transfer
Trap is used to remove __________ from steam pipe lines.

Steam
None of these
Non-condensables
Condensate

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Heat Transfer
A body cools down from 75°C to 70°C in 10 minutes. It will cool down from 70° C to 65° C in __________ minutes.

10
>10
Either B or C, depends on the mass of the body

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Heat Transfer
The Nusselt number for fully developed (both thermally and hydrodynamically) laminar flow through a circular pipe, where the wall heat flux is constant, is

4.36
120.36
Dependent on NRe only
2.36

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Heat Transfer
When vaporisation takes place through a blanketting film of gas, the phenomenon is termed as __________ boiling.

film
transition
none of the listed here
pool

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