Engineering :: Refrigeration and Air conditioning

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"The difference between the length of a certain brass rod and that of a steel rod is clamped to be constant at all temperatures". The above statement

[A].	can never be true	[B].	can be valid only for temperatures below 0?C
[C].	can be true provided their lengths are directly proportional to the linear coefficients of the material of the rod	[D].	can be true provided their lengths are directly proportional to the linear coefficients of the material of the rod

Answer: Option D