Two shafts A and B are made of the same material. The diameter of shaft A is twice as that of shaft B. The power transmitted by the shaft A will be __________ of shaft B.
A. Twice
B. Four times
C. Eight times
D. Sixteen times
Answer: Option C
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Shear stress=16T/pi*d^3.
T is proportional to d^3
Power transmitted is directly proportional to the d^3