HEAT AND MASS TRANSFER QUIZ

Newton's law of cooling

Newton's law of heating

Stefan's law

First law of thermodynamics

Zero

Maximum

Minimum

None of these

K.cal (heat)

°C (temperature)

Sq. m (area)

Hr (time)

Conduction

Radiation

Forced convection

Free convection

P=1, T = 0 and a = 0

P = 0, x = 1 and a = 0

X = 0, a + p = 1

P = 0, x = 0 and a = 1

Both the fluids at inlet are in their hottest state

Both the fluids at exit are in their hottest state

One fluid is in hottest state and other in coldest state at inlet

Both the fluids at inlet (of heat exchanger where hot fluid enters) are in their coldest state

black bodies

All of these

polished bodies

all coloured bodies

Radiant heat is proportional to fourth power of absolute temperature

Emissive power depends on temperature

Emissive power and absorptivity are constant for all bodies

Ratio of emissive power to absorptive power for all bodies is same and is equal to the emissive power of a perfectly black body

Steam condenser

Electric heater

Refrigerator condenser coils

Boiler

Depends upon the shape of body

Lower

Higher

Same