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Heat Transfer

Heat Transfer
jH factor for heat transfer is not a function of the __________ number.

Nusselt
Reynolds
Grashoff
Both B & C

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Heat Transfer
Graetz number is given by

kμ/mCp
mCp/kL
kL/mCp
mCp/kμ

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Heat Transfer
Heat exchanger tubes are never made of

Lead
Stainless steel
Copper
Plain carbon steel

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Heat Transfer
Radiation heat losses from satisfactorily insulated high pressure boilar may be about __________ percent.

7
26
18
1

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Heat Transfer
1000 kg of wet solids are to be dried from 60% to 20% moisture (by weight). The mass of moisture removed in kg is

520
400
200
500

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Heat Transfer
Economy of an evaporator is influenced by the

Both B & C
Feed temperature
Number of effect
Steam pressure

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