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Heat and Mass Transfer

Heat and Mass Transfer
LMTD in case of counter flow heat exchanger as compared to parallel flow heat exchanger is

Depends on the area of heat exchanger
Lower
Same
Higher

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Heat and Mass Transfer
According to Wien's law, the wavelength corresponding to maximum energy is proportion to

I²
T
Absolute temperature (T)
F

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Heat and Mass Transfer
In convection heat transfer from hot flue gases to water tube, even though flow may be turbulent, a laminar flow region (boundary layer of film) exists close to the tube. The heat transfer through this film takes place by

Convection
Both convection and conduction
Conduction
Radiation

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Heat and Mass Transfer
Two balls of same material and finish have their diameters in the ratio of 2: 1 and both are heated to same temperature and allowed to cool by radiation. Rate of cooling by big ball as compared to smaller one will be in the ratio of

0.16736111111111
0.043055555555556
0.084027777777778
0.042361111111111

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Heat and Mass Transfer
Log mean temperature difference in case of counter flow compared to parallel flow will be

Less
Same
More
Depends on other factors

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Heat and Mass Transfer
Depending on the radiating properties, a body will be opaque when

P = 0, x = 0 and a = 1
P = 0, x = 1 and a = 0
P=1, x = 0 and a = 0
X = 0, a + p = 1

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MORE MCQ ON Heat and Mass Transfer

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