1. The common function of all controls is to control the operation of an electric motor.
a. True
b. False
2. Equipment that is tested and approved by UL is listed in a publication that is updated every two years.
a. True
b. False
3. A manual control is one whose operation is accomplished by mechanical means.
a. True
b. False
4. Float switches are rotary, manual switching devices that are often used to reverse motors and to control the speed of
AC and DC motors.
a. True
b. False
5. Automatic stopping devices greatly reduce the safety hazards of operating some types of machinery.
a. True
b. False
Name: Class: Date:
Unit 1 General Principles of Electric Motor Control
6. The fundamental tasks of a motor controller are to start and stop the motor and to protect the motor, machine,
product, and ____.
a. instruments b. pipes
c. plant d. operator
7. Air compressors are started directly or indirectly on a call for more air by a ____.
a. thermostat b. float switch
c. pressure switch d. limit switch
8. ____ are used most frequently as overtravel stops for machines, equipment, and products in process.
a. Thermostats b. Float switches
c. Pressure switches d. Limit switches
9. A varying speed is usually preferred for ____.
a. water pumps b. cranes and hoists
c. turret lathes d. paper and printing plants
10. Current-limiting acceleration is also called ____.
a. compensating time b. acc time
c. delay time d. limiting time
Name: Class: Date:
Unit 1 General Principles of Electric Motor Control