1. Plugging controls provide for the rapid stop and quick reversal of motor rotation.
a. True
b. False
2. Standard reversing controllers cannot be plugged manually.
a. True
b. False
3. The torque that operates the plugging switch contacts will vary according to the speed of the motor.
a. True
b. False
4. You can predetermine the direction of the rotation of motors when the phases are connected externally in proper
sequence.
a. True
b. False
5. A time-delay relay may be used in a motor plugging circuit.
a. True
b. False
Name: Class: Date:
Unit 48 Plugging
6. Plugging switches are also known as ____ switches.
a. temperature b. zero-speed
c. pressure d. limit
7. In ____ cases, the machines controlled by plugging switches will be driven by squirrel cage motors.
a. a very few b. some
c. most d. all
8. The plugging switch may be driven by gears, by a chain drive, or a ____ coupling.
a. welded half b. direct rigid
c. welded current d. direct flexible
9. The lockout relay provides a mechanical means of preventing the switch contacts from closing ____ the motor
starting circuit is energized.
a. unless b. if
c. if and only if d. even if
10. Antiplugging protection is obtained when a device prevents the application of a counter torque until the motor speed
____.
a. decreases to zero b. is reduced to an acceptable value
c. decreases below a preset limit d. increases above a preset limit
Name: Class: Date:
Unit 48 Plugging