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Heat and Mass Transfer

Heat and Mass Transfer
An ordinary passenger aircraft requires a cooling system of capacity.

4 TR
2 TR
8 TR
10 TR

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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
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
0.043055555555556
0.16736111111111
0.084027777777778

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Heat and Mass Transfer
Absorptivity of a body will be equal to its emissivity

At critical temperature
When system is under thermal equilibrium
At all temperatures
At one particular temperature

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Heat and Mass Transfer
When α is absorptivity, ρ is reflectivity and τ is transmissivity, then for a diathermanous body,

α = 0, ρ = 1 and τ = 0
α = 1, ρ = 0 and τ = 0
α = 0, ρ = 0 and τ = 1
α + ρ = 1 and τ = 0

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Heat and Mass Transfer
Free convection flow depends on

Coefficient of viscosity
Density
All of these
Gravitational force

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MORE MCQ ON Heat and Mass Transfer

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