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Heat and Mass Transfer

Heat and Mass Transfer
Emissivity of a white polished body in comparison to a black body is

Lower
Same
Higher
Depends upon the shape of body

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Heat and Mass Transfer
Thermal conductivity of water in general with rise in temperature

May increase or decrease depending on temperature
Remain constant
Decreases
Increases

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Heat and Mass Transfer
The value of Prandtl number for air is about

0.3
0.1
1.7
0.7

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Heat and Mass Transfer
Heat conducted through per unit area and unit thick face per unit time when temperature difference between opposite faces is unity, is called

Thermal conductivity
Thermal resistance
Temperature gradient
Thermal coefficient

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Heat and Mass Transfer
Joule sec is the unit of

Thermal conductivity
Planck's constant
Universal gas constant
Kinematic viscosity

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Heat and Mass Transfer
Pick up the wrong case. Heat flowing from one side to other depends directly on

Thickness
Temperature difference
Time
Face area

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MORE MCQ ON Heat and Mass Transfer

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