A Universal (Hooke's) Joint connects two intersecting shafts. If the angle between the shafts is $\alpha > 0$, the driven shaft has:
Options:
(A) A fluctuating angular velocity during each revolution even if the driver rotates at constant speed
(B) A strictly constant angular velocity identical to driver at every instant
(C) Zero torque transmission capacity
(D) Constant angular acceleration
Answer Key:
A
Step-by-Step Solution & Explanation
For a single Hooke's joint, $\frac{\omega_2}{\omega_1} = \frac{\cos \alpha}{1 - \sin^2 \alpha \cos^2 \theta_1}$. The angular velocity oscillates between $\omega_1 \cos \alpha$ and $\omega_1 / \cos \alpha$ twice per revolution.