1. What is a controller and what is its function? (Use the Glossary and the information from this unit to answer this question.)
2. What is meant by remote control?
3. To what does current limiting, or compensating time, acceleration refer?
4. List some devices that are used to control a motor automatically. Briefly describe the purpose of each device.
Select the best answer for each of the following.
5. The general purpose of motor control is
a. to start the motor
b. to stop the motor
c. to reverse the motor
d. all of the above
6. A motor may be controlled manually by using a
a. float switch
b. pressure switch
c. toggle switch
d. time clock
7. A motor may be controlled remotely or automatically by using a
a. drum controller
b. thermostat
c. safety switch
d. faceplate control
8. Conditions that may affect starting and stopping of motor driven machinery are
a. fast or slow starts
b. light or heavy duty starting
c. frequency of starting and stopping
d. all of the above
9. Which factor is not to be considered for motor speed control when the motor is running?
a. Constant speed
b. Varying speed
c. Multispeed
d. Starting protection
10. Which is not considered a motor controller protective feature?
a. Overload
b. Short circuit
c. Adjustable speed
d. Mechanical
11. Which function is not a fundamental job of a motor controller?
a. Start and stop the motor
b. Protect the motor, machine, and operator
c. Reverse, inch, jog, speed control
Motor disconnect switch and starting protection
1. What factors are to be considered when selecting and installing a controller?
a. Electrical service
b. Motor
c. Electrical codes and standards
d. All of the above
2. Dynamic braking for a de motor is accomplished by
a. connecting ac voltage to the armature
b. maintaining de current flow through the field and connecting the armature to a load resistor
c. maintaining de current flow through the armature and connecting a load resistor to the field
d. disconnecting de power from the motor and reconnecting the armature to a load resistor
3. Dynamic braking for an ac motor is accomplished by
a. disconnecting ac power from the motor leads and reconnecting the motor to a load resistor
b. reversing the direction of rotation of the motor
c. connecting de voltage to the stator leads
d. connecting a load resistor in series with the motor leads