During an RRB JE solution review on Hollow Shafts, what is the safest statement about material removed from the core of a circular shaft? Avoid the common trap that removing core material always reduces strength in the same proportion as area.
Choose the correct answer
maximum torsional stress occurs at the inner radius
polar moment depends only on area
removing core material always reduces strength in the same proportion as area
a hollow shaft can be more efficient by placing material away from the centre
Correct Answer
D. a hollow shaft can be more efficient by placing material away from the centre
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Torsional resistance benefits from material at larger radius. Correct option: D.
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This MCQ belongs to RRB JE Civil & Allied Engineering CBT-2 Full Mock Test Series. Full tests include timed attempts, rank comparison and subject-wise analysis.