Reason (R): Low brush commutator friction and still higher torque/inertia have been achieved in DC servomotors.
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 but R is false
D. A is false but R is true
Answer:A
Reason (R): Low brush commutator friction and still higher torque/inertia have been achieved in DC servomotors.
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 but R is false D. A is false but R is true
Explanation: AC servomotors are replaced by DC servomotors as frictional losses and higher torque/inertia ratios have been achieved.