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Heat and Mass transfer - Gate Questions

1.

The material which has high thermal diffusivity,

Responds slowly to temperature change

Responds rapidly to temperature change

Response to temperature change independent of thermal diffusivity

None of these

2.

A plane wall is 75mm thick and its wall area is 2.5m². If its conductivity is 9.0W/m-°C and surface temperature is steady at 150°C and 45°C, determine the heat flow across the plane wall?

7.0kW

4.5kW

31.5kW

5.8kW

3.

For a specified conductive thermal resistance, the highest insulator will be one which has the

Smallest density(p)

Smallest thermal conductivity(k)

Smallest product of density(p) and thermal conductivity(K)

Smallest surface temperature

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