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Heat and Mass Transfer

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

8 TR
2 TR
10 TR
4 TR

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Heat and Mass Transfer
A non-dimensional number generally associated with natural convection heat transfer is

Grashoff number
Weber number
Nusselt number
Prandtl number

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Heat and Mass Transfer
Thermal diffusivity of a substance is given by (where h = Thermal diffusivity, ρ = Density of substance, S = Specific heat, and k = Thermal conductivity)

h = k/ ρS
h = ρS/k
h = S/ρk
h = kρ/S

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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
Emissivity
Emissive power
Absorptivity

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Heat and Mass Transfer
The emissivity for a black body is

0.75
1
0.5

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Heat and Mass Transfer
The emissive power of a body depends upon its

Temperature
All of these
Wave length
Physical nature

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MORE MCQ ON Heat and Mass Transfer

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