Assertion ( A ): The speed of a shaft can be measured by using a dc tacho generator.
Reason ( R ): A two phase servometer can also be used as a speed transducer.
A. Both A and R are true and R is correct explanation of A
B. Both A and R are true but R is not correct explanation of A
C. A is true R is false
D. A is false R is true
Share your understanding of this question with the correct explanation.