SSC JE Mechanical Engineering 2017 Set 1 Paper

Question : 117 of 200

Marks: +1, -0

Minimum thermal diffusivity is of_____.

Aluminium
Rubber
Iron
Lead

Solution:

Thermal diffusivity  thermal conductivity Abovethis option thermal conductivity is low for rubber,so thermal diffusivity will also be low.Aluminium –

8.7 × 10^{–5} m^2\/s

Rubber –

0.013 × 10^{–5} m^2\/s

Iron –

2.03 × 10^{–5} m^2\/s

Lead –

2.3 × 10^{–5} m^2\/s

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