railway RRB JE (CBT I + CBT II) Mock Test 2024 Electrical Machines Single Phase Motor and Special Machines Servo Motors
Effect of back emf in a armature controlled dc servomotor is
1
To increase effective motor friction thereby reducing motor time constant
2
To increase effective motor friction thereby increasing motor time constant
3
To increase motor inertia, thereby increasing motor time constant
4
To increase motor inertia, thereby reducing motor time constant