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Heat and Mass Transfer

Heat and Mass Transfer
Unit of thermal diffusivity is

kcal/m² hr
m²/hr
m²/hr °C
kcal/m. hr °C

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Heat and Mass Transfer
Joule sec is the unit of

Universal gas constant
Thermal conductivity
Kinematic viscosity
Planck's constant

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Heat and Mass Transfer
Free convection flow depends on

Gravitational force
Coefficient of viscosity
Density
All of these

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

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

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Heat and Mass Transfer
In heat exchangers, degree of approach is defined as the difference between temperatures of

Hot medium outlet and cold water outlet
Cold water inlet and outlet
Hot medium outlet and cold water inlet
Hot medium inlet and outlet

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Heat and Mass Transfer
Two plates spaced 150 mm apart are maintained at 1000°C and 70°C. The heat transfer will take place mainly by

Radiation
Free convection
Forced convection
Convection

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MORE MCQ ON Heat and Mass Transfer

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