GATE ME 1994 | Conduction Question 47 | Heat Transfer

GATE ME 1994

MCQ (Single Correct Answer)

-0.3

Two insulting materials of thermal conductivity $$K$$ and $$2K$$ are available for lagging a pipe carrying a hot fluid. If the radial thickness of each material is same

Material with higher thermal conductivity should be used for inner layer and one with lower thermal conductivity for the outer.

Material with lower thermal conductivity should be used for the inner layer and one with higher thermal conductivity for the outer.

It is immaterial in which sequence the insulating materials are used

It is not possible to judge unless numerical values of dimensions are given

GATE ME 1990

MCQ (Single Correct Answer)

-0.3

Thermal conductivity is lower for

wood

air

water at $${100^ \circ }C$$

steam at $$1$$ bar

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