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Heat Transfer

Heat Transfer
1 BTU/hr.ft.°F is equal to __________ kcal/hr. m.°C.

None of these
4.88
1
1.49

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Heat Transfer
Log mean temperature difference (LMTD) cannot be used, if

none of the listed here
there exists an unsteady state
the heat capacity is not constant and there is a phase change.
heat transfer co-efficient over the entire heat exchanger is not constant

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Heat Transfer
In case of evaporators, liquid entrainment results primarily due to

high heat transfer rate
high vacuum in the evaporator
foaming of the solution
high heat transfer rate

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Heat Transfer
Steam traps are provided in steam carrying pipelines to

remove condensate and inert gases
none of the listed here
condense steam
release excess steam pressure by bleeding steam.

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Heat Transfer
An evaporator while concentrating an aqueous solution from 10 to 40% solids evaporates 30000 kg of water. The amount of solids handled by the system in kg is

4000
9000
3000
4600

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Heat Transfer
Electro-magnetic spectrum range, which is important for radiation varies from __________ microns.

10 to 100
1 to 100
0.5 to 50
100 to 1000

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