Question

A homogeneous shaft PQR with fixed supports at both ends is subjected to a torsional moment T at point Q, as shown in the figure. The polar moments of inertia of the portions PQ and QR of the shaft with circular cross-sections are $J_1$ and $J_2$, respectively. The torsional moment reactions at the supports P and R are $T_p$ and $T_R$, respectively.If $\frac {T_p}{T_R} = 4$ and $\frac {J_1}{J_2} = 2$, the ratio of the lengths $\frac {L_1}{L_2}$ is

• A. 0.50
• B. 0.25
• C. 4.00
• D. 2.00

Answer 1

Answer: (A)

0.50

Answer 2

The correct option is (A): 0.50