HEAT AND MASS TRANSFER QUIZ

Same

Higher

Lower

Depends upon the shape of body

Counter flow

Parallel flow

Cross flow

All of these

Heat transfer in most of the cases takes place by combination of conduction, convection and radiation

Heat transfer by radiation requires no medium

All bodies above absolute zero emit radiation

It is impossible to transfer heat from low temperature source to t high temperature source

Whether to put inferior OIL over pipe or the better one would depend on steam temperature

Inferior insulation should be put over pipe and better one over it

Both may be put in any order

Better insulation should be put over pipe and better one over it

Liquids

None of these

Solids

Gases

Glass

Plastic

Air

Water

Black body

Opaque body

Grey body

White body

All of these

Domestic refrigerators

Room air conditioners

Water coolers

Counter flow type

Parallel flow type

Regenerator type

Cross flow type

Q = [2π (T₁ - T₂)]/2.3 lk log (r₂/r₁)

Q = 2.3 log (r₂/r₁)/[2πlk (T₁ - T₂)]

Q = = 2πlk/2.3 (T₁ - T₂) log (r₂/r₁)

Q = [2πlk (T₁ - T₂)]/2.3 log (r₂/r₁)