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Heat and Mass Transfer

Heat and Mass Transfer
Unit of thermal conductivity in M.K.S. units is

K cal/kg m² °C
K calm/hr °C
K cal m/hr m² °C
K cal/hr m² °C

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Heat and Mass Transfer
The most commonly used method for the design of duct size is the

Equal friction method
Velocity reduction method
Static regains method
Dual or double method

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Heat and Mass Transfer
The ratio of the energy absorbed by the body to total energy falling on it is called

Absorptive power
Absorptivity
Emissive power
Emissivity

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Heat and Mass Transfer
According to Kirchoff's law, the ratio of emissive power to absorptivity for all bodies is equal to the emissive power of a

Grey body
Brilliant white polished body
Black body
Red hot body

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Heat and Mass Transfer
A designer chooses the values of fluid flow rates and specific heats in such a manner that the heat capacities of the two fluids are equal. A hot fluid enters the counter flow heat exchanger at 100°C and leaves at 60°C. A cold fluid enters the heat exchanger at 40°C. The mean temperature difference between the two fluids is

66.7°C
20°C
60°C
40°C

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Heat and Mass Transfer
A grey body is one whose absorptivity

Does not vary with temperature and. wavelength of the incident ray
Varies with wavelength of the incident ray
Varies with temperature
Is equal to its emissivity

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MORE MCQ ON Heat and Mass Transfer

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