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Which of the following motor is used in recording instruments?

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Which of the following motor is used in recording instruments?

(a) Reluctance motor

(b) Induction motor

(c) Synchronous motor

(d) DC motor

I have been asked this question in unit test.

My question is from Solid State Controlled Drives in chapter Introduction to Solid State Controlled Drives of Electric Drives

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Right answer is (a) Reluctance motor

The explanation is: Reluctance motor is used in recording instruments. It is used for many constant speed applications. The starting torque of the motor depends upon the rotor position.

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