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Motors ch 12

Braking

QuestionAnswer
1. ___ braking is a method of dynamic braking that reuses the braking energy to the AC source instead of dissipating the energy as heat. Regenerative
2. A solenoid is used to activate the brake shoes with ___ brakes. friction
3. A Brake solenoid should always be connected directly into the __- circuit. motor
4. ___ braking requires more maintenance than any other method of braking. Friction
5. A typical solenoid brake coil is rated for __VAC and can be used in both the low- and high-voltage connections of a dual-voltage motor. 240
6. Plugging a motor to a stop results in high current and heat. True or False True
7. In the event of a power failure, __ is the only method that can stop a motor. friction braking
8. __ braking can be used to provide an immediate stop, particularly in an emergency situation. Electric
9. A single-phase shaded-pole motor can be used in a plugging circuit because it can be reversed at full speed. True or False False that type of motor cannot be reversed at any speed.
10.The __ in the control circuit prevents the motor starter and braking contactor from being energized at the same time. interlock system
11. Braking a motor one time by plugging puts about the same amount of heat into the rotor as starting the motor at full voltage. True or False False. Plugging may create 3 or more times the current than normal starting. Plugging reverses the motor at full speed.
12. A motor drive can control the time it takes for a motor to stop. True or False True
13. Power resistors are used with ___ braking to dissipate the heat of braking. dynamic
14. A(n) ___ with tapped windings is used to adjust the amount of braking torque applied to a motor. transformer
15. Dynamic braking can NOT brake a motor to a complete stop or be used as a holding brake. True or False True
16. ___ braking requires frequent inspection, maintenance, and replacement of brake shoes. Friction
17. In a dual-voltage delta-configured motor wired for high-voltage operation, the solenoid brake coil is wired across only one coil. True or False True
18. In friction braking, the braking action is applied directly to the shaft. True or False False. Brake shoes or pads contact a wheel on the shaft.
19. Total interlocking is the use of mechanical, electrical, and pushbutton interlocking. True or False True
20. The motor connections are reversed with ___ so that the motor develops a reversed torque to brake the motor. plugging
22. In the illustration page 62, a load (shunt) resistor is used with a dynamic braking system. What is the purpose of the resistor? How does it act as a brake? provides path for current.
23. in the illustration page 62, coil B is a solenoid brake coil that is installed correctly. The voltage rating of the coil is ___V. 240
Created by: JoshHampton
 

 



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