FREE AND STUDY GAMES ABOUT MOTORS CH 12 EXAM

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FREE AND STUDY GAMES ABOUT MOTORS CH 12 EXAM

QUESTIONS

Actual Qs and Ans Expert-Verified Explanation

This Exam contains:

-Guarantee passing score -22 Questions and Answers -format set of multiple-choice -Expert-Verified Explanation

Question 1: 2. A solenoid is used to activate the brake shoes with ___ brakes.

Answer:

friction Question 2: 10.The __ in the control circuit prevents the motor starter and braking contactor from being energized at the same time.

Answer:

interlock system Question 3: 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

Answer:

False that type of motor cannot be reversed at any speed.Question 4: 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.

Answer:

240

Question 5: 12. A motor drive can control the time it takes for a motor to stop. True or False

Answer:

True Question 6: 6. Plugging a motor to a stop results in high current and heat. True or False

Answer:

True Question 7: 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

Answer:

False. Plugging may create 3 or more times the current than normal starting. Plugging reverses the motor at full speed.Question 8: 19. Total interlocking is the use of mechanical, electrical, and pushbutton interlocking. True or False

Answer:

True Question 9: 18. In friction braking, the braking action is applied directly to the shaft. True or False

Answer:

False. Brake shoes or pads contact a wheel on the shaft.Question 10: 4. ___ braking requires more maintenance than any other method of braking.

Answer:

Friction Question 11: 15. Dynamic braking can NOT brake a motor to a complete stop or be used as a holding brake. True or False

Answer:

True

Question 12: 7. In the event of a power failure, __ is the only method that can stop a motor.

Answer:

friction braking Question 13: 16. ___ braking requires frequent inspection, maintenance, and replacement of brake shoes.

Answer:

Friction Question 14: 14. A(n) ___ with tapped windings is used to adjust the amount of braking torque applied to a motor.

Answer:

transformer Question 15: 13. Power resistors are used with ___ braking to dissipate the heat of braking.

Answer:

dynamic Question 16: 1. ___ braking is a method of dynamic braking that reuses the braking energy to the AC source instead of dissipating the energy as heat.

Answer:

Regenerative Question 17: 8. __ braking can be used to provide an immediate stop, particularly in an emergency situation.

Answer:

Electric Question 18: 3. A Brake solenoid should always be connected directly into the __- circuit.

Answer:

motor Question 19: 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?

Answer:

provides path for current.

Question 20: 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.

Answer:

240 Question 21: 20. The motor connections are reversed with ___ so that the motor develops a reversed torque to brake the motor.

Answer:

plugging Question 22: 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

Answer:

True