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Heat and Mass Transfer

Heat and Mass Transfer
The unit of Stefan Boltzmann constant is

watt2/cm °K⁴
watt/cm3 °K
watt/cm4 °K
watt/cm2 °K⁴

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Heat and Mass Transfer
The natural convection air cooled condensers are used in

Water coolers
Room air conditioners
Domestic refrigerators
All of these

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Heat and Mass Transfer
Two long parallel surfaces each of emissivity 0.7 are maintained at different temperatures and accordingly have radiation heat exchange between them. It is desired to reduce 75% of the radiant heat transfer by inserting thin parallel shields of emissivity 1 on both sides. The number of shields should be

Two
Three
One
Four

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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

0.042361111111111
0.16736111111111
0.084027777777778
0.043055555555556

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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

Conduction
Radiation
Both convection and conduction
Convection

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Heat and Mass Transfer
Temperature of steam at around 540°C can be measured by

None of these
Thermistor
Thermocouple
Thermometer

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