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Heat and Mass Transfer

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

Thermocouple
None of these
Thermometer
Thermistor

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Heat and Mass Transfer
Depending on the radiating properties, a body will be black when(Where a = absorptivity, p = reflectivity, X = transmissivity.)

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

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Heat and Mass Transfer
The thermal diffusivities for solids are generally

More or less same as for liquids and gases
More than those for liquids and gases
Less than those for liquids
Less than those for gases

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Heat and Mass Transfer
In heat transfer, conductance equals conductivity (kcal/hr/sq.m/°C/cm) divided by

Sq. m (area)
°C (temperature)
K.cal (heat)
Hr (time)

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Heat and Mass Transfer
The ratio of the emissive power and absorptive power of all bodies is the same and is equal to the emissive power of a perfectly black body. This statement is known as

Planck's law
Wien's law
Kirchhoff's law
Stefan's law

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Heat and Mass Transfer
The value of the wavelength for maximum emissive power is given by

Fourier's law
Planck's law
Stefan's law
Wien’s law

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MORE MCQ ON Heat and Mass Transfer

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