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Q.

Two rods of equal length and area of cross-section are kept parallel and lagged between temperature 20°C and 80°C. The ratio of the effective thermal conductivity to that of the first rod is [the ratio (K1/K2) = 3 : 4]

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a

4 : 7

b

7 : 6

c

7 : 8

d

7 : 4

answer is B.

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Detailed Solution

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For parallel combination of two rods of equal length and equal area of cross-section:
K=K1+K22=K1+4K132=7K16; Hence KK1=76

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