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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
Harmonic mean temperature difference is given by

2.(ΔT₁ . ΔT₂)/(ΔT₁ + ΔT₂)
2.(ΔT₁ . ΔT₂)(ΔT₁ - ΔT₂)
(ΔT₁ - ΔT₂)/(ΔT₁ . ΔT₂)
√(ΔT₁ . ΔT₂)

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Heat Transfer
The steam ejector is used to

None of these
Create vacuum
Superheat the steam
Remove condensate from the steam pipelines

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

Grashoff
Both B & C
Reynolds
Nusselt

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Heat Transfer
What is the absorptivity of a black body?

1
0.95
0.78

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Heat Transfer
It is not preferable to use superheated steam in evaporators, because of its very

high pressure
none of the listed here
high temperature
low film co-efficient

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