1. The number of accelerating contactors depends on the desired number of speeds for the motor.
a. True
b. False
2. The motor starts slowly with full resistance in the primary circuit.
a. True
b. False
3. The speed may be changed from medium to low or high to low by pressing the medium-speed push button.
a. True
b. False
4. The resistors should have a high enough power rating to operate at any speed.
a. True
b. False
5. Magnetic controllers for wound rotor motors consist of a magnetic starter that connects the primary or stator winding
to ____.
a. the run contactor b. the power line
c. segments of the commutator d. the starter
Name: Class: Date:
Unit 35 Push-Button Speed Selection
6. Magnetic controllers for wound rotor motors consist of one or more accelerating contactors that cut out steps of
resistance in the ____.
a. primary circuit b. stator circuit
c. secondary circuit d. branch circuit
7. A disadvantage of the method of push-button speed selection is that the motor and the driven machine can be
accelerated without allowing sufficient time between steps for the rotor to gain its ____ for each step of acceleration.
a. minimum speed b. maximum torque
c. minimum torque d. maximum speed
8. The desired time delay can be achieved by adding ____ to the circuit to prevent too rapid an acceleration.
a. compelling relays b. accelerating relays
c. overload relays d. reversal relays
Name: Class: Date:
Unit 35 Push-Button Speed Selection