1. Line diagrams include all of the devices in the system and show the physical relationships between the devices.
a. True
b. False
2. The control circuit consists of the main contacts and the overload heaters to the motor.
a. True
b. False
3. Three-wire control prevents the restarting of machinery when power is restored.
a. True
b. False
4. Motors draw half as much current on high voltages as they do on low voltages.
a. True
b. False
5. Throttle valves and narrow pipes can waste huge amounts of power.
a. True
b. False
Name: Class: Date:
Unit 5 Interpretation and Application of Simple Wiring and Elementary Diagrams
6. Two-wire control ____.
a. provides no-voltage protection or low-voltage protection
b. involves the use of a maintaining circuit
c. prevents the restarting of machinery when power is restored
d. provides no-voltage release or low-voltage release
7. A target table is useful in interpreting circuit drawings and for ____.
a. moving contacts b. reversing interchange lines
c. simplifying troubleshooting d. moving large lots of motors
8. Target tables are often used in complicated circuits to simplify the interpretation of the operation of large ____.
a. three-position selector switches b. selector switches
c. master switches d. multicircuit drum switches
9. The service factor of a general-purpose motor is a(n) ____.
a. allowable overload b. indication of materials used
c. indication of efficiency d. way to identify a motor
10. To reverse a single-phase AC motor, either the starting or running windings connections must ____.
a. identify a specific motor b. be reversed on the line
c. be equal to the supply voltage d. have a high voltage rating
Name: Class: Date:
Unit 5 Interpretation and Application of Simple Wiring and Elementary Diagrams