Which of the following is a desirable characteristic of a DC servomotor?

Servo motors have less inertia than comparable induction motors because they are smaller in size. Because of its low inertia, the synchronous motor can accelerate and decelerate much faster to and from its rated speed. It also allows for much more precise acceleration and deceleration from full speed.

DC servomotor

A type of servomotor that uses DC electrical input to generate mechanical output like velocity, acceleration, or position is known as a DC servomotor. 

Servo motors are typically AC synchronous brushless motors with built-in positional feedback. Servo motors are used in closed-loop motion control systems where angular position, speed, and torque can be very accurately controlled.

The rotor of a servo motor uses permanent magnets and can be infinitely positioned between magnetic poles on the stator by varying the voltage and current between windings.

Advantages of DC Servo Motors:

• High efficiency
• More constant torque at a higher speed
• Quiet operation
• Less inertia
• ​High ratio of torque to weight
• High acceleration
• High-speed performance
• Torque control
• High accuracy