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A tachometer is added to servomechanism because:

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A tachometer is added to servomechanism because:

(a) It is easily adjustable

(b) It can adjust damping

(c) It reduces steady state error

(d) It converts velocity of the shaft to a proportional Dc voltage

The question was posed to me in quiz.

This intriguing question originated from Differential Equations of Physical Systems and Dynamics of Robotic Mechanisms topic in section Mathematical Models of Physical Systems of Control Systems

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Right choice is (b) It can adjust damping

To explain I would say: A tachometer is a device to control the speed and adjust damping and it is used in servomechanism to adjust damping and mainly is used in AC servomotors.

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