engineering recuitment DRDO Technician A 2022 Mock Test Series (Tier I) Electrician and Wireman Electrical Machines Single Phase Motors
Which of the following speed control methods are used in universal motors?
(1) By connecting a variable resistance R in series with the motor.
(2) A field pole is tapped at different points and the speed is controlled by varying the field intensity.
(3) Using a centrifugal system.
1
(1), (2) and (3)
2
(2) and (3)
3
(1) and (2)
4
(1) and (3)