1. In a three-wire control circuit, when the supply voltage returns after a failure, the circuit is re-energized.
a. True
b. False
2. Pilot lights are tested frequently to ensure operation.
a. True
b. False
3. Sirens, horns, and loud buzzers may be used in production systems to call attention to malfunctions.
a. True
b. False
4. It is sometimes desirable to operate push buttons or other control devices at some voltage higher than the motor
voltage.
a. True
b. False
5. When configuring separate control wiring, the maintenance technician must ensure that the proper connections are
made.
a. True
b. False
Name: Class: Date:
Unit 18 Three-Wire and Separate Controls
6. A three-wire control circuit uses momentary contact, start-stop stations, and a holding circuit interlock connected
____ with the start button to maintain the circuit.
a. in tandem b. in parallel
c. alternately d. in series
7. What is the first action when the start button of a three-wire control circuit is pushed?
a. The circuit is completed through the coil.
b. The contacts close.
c. The power circuit contacts to the motor close.
d. The holding contact remains off.
8. The operation of the overload protection ____ the control circuit.
a. opens b. cancels
c. closes d. verifies
9. No-voltage protection protects ____.
a. only the operator b. either the operator or the equipment
c. both the operator and the equipment d. only the equipment
10. It is necessary to restart a motor after it has been stopped by a three-wire control circuit with ____ protection.
a. high-voltage b. high-temperature
c. low-resistance d. low-voltage
Name: Class: Date:
Unit 18 Three-Wire and Separate Controls