Heat Transfer MCQs

Black painted bodies only

All bodies

Polished bodies only

A black body

1

> 1

< 1

Between 1 & 2

Nu = (Re) (Pr) (Gz)

Nu = (Re) (Pr) (St)

Nu = (Re)(Pr)

Nu = (Pr)(St)

√d

d

d2

d1.5

1

< 1

> 1

None of these

Higher condensing film co-efficient is desired

Condensate is corrosive in nature

Lower pressure drop through the exchanger is desired

Temperature of the incoming vapor is very high

0

R₂/(R₁+R₂)

1

(R₁/R₂)2

Steam

Condensate

Non-condensables

None of these

Nature of heating surface and distribution of bubbles

Surface tension of water

Viscosity of water

All of the above

Co-current

Counter-current

Turbulent

Laminar