Discussion
A low rotor inertia is wanted in a servo machine because it
Answer: B
Correct answer: allows rapid acceleration for a given torque
Angular acceleration is torque divided by inertia, so halving the inertia doubles the acceleration for the same torque. A servo machine is therefore built long and slender rather than short and fat, since inertia grows as the fourth power of the radius while torque grows only as the square.
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