FREE AND STUDY GAMES ABOUT MOTORS CH 11 EXAM

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FREE AND STUDY GAMES ABOUT MOTORS CH 11 EXAM

QUESTIONS

Actual Qs and Ans Expert-Verified Explanation

This Exam contains:

-Guarantee passing score -25 Questions and Answers -format set of multiple-choice -Expert-Verified Explanation Question 1: 18. External resistance is added to and taken away from the motor circuit in a(n) ___ starting circuit.

Answer:

primary-resistor Question 2: 11. Most soft starters have gradual stopping capabilities. True or False

Answer:

True Question 3: 15. In an open-circuit transition, the motor is temporarily disconnected from the voltage source as the motor is switched from reduced-voltage starting to full-voltage running.True or False

Answer:

True Question 4: 5. Reduced-voltage starting must be applied to DC motors larger than ___HP in order to prevent motor damage.

Answer:

1hp

Question 5: 10. ___ starting devices are small, durable, and have no contacts.

Answer:

solid-state Question 6: 24. Using the illustration, identify the DC motor starting circuits as series, shunt, and compound. See page 56 workbook.

Answer:

A = series b = shunt, c = compound Question 7: 3. Motors that are started at reduced voltage must be switched to line voltage before they can reach full speed. True or False

Answer:

True

Question 8: 17. ____ starting is not a method of reduced-voltage starting.

Answer:

Line-voltage Question 9: 7. The electric utility limits the current draw from the power line on the line side of the transformer to about of ___% of full-load current.

Answer:

400 Question 10: 21. In a(n) ___ starting circuit, the various windings of the transformer are added to and taken away from the motor circuit to provide reduced voltage when starting.

Answer:

autotransformer Question 11: 6. In wye-delta starting, a motor starter is started with approximately ___ of the normal voltage and develops approximately 33% of the normal torque.

Answer:

58%

Question 12: 1. ___ starters provide very smooth starting due to increasing voltage across the motor terminals as the motor accelerates

Answer:

primary-resistor Question 13: 23. Both solid-state starting and ___ starting methods are adjustable.

Answer:

primary-resistor

Question 14: 25. read question on page 57 workbook

Answer:

Closed Question 15: 19. Part-winding starting should be applied to all motors. True or False

Answer:

False Question 16: 13. For a ___ motor, the voltage to the winding is less than the line voltage.

Answer:

wye-connected Question 17: 2. Magnetic motor starters include __- that detect excessive current passing through a motor and are used to switch all types and sizes of motors.

Answer:

overload relays

Question 18: 20. ___ starting produces less starting torque than full voltage.

Answer:

Part-winding

Question 19: 14. ___ motors are usually special-order motor.

Answer:

Wye-delta

Question 20: 16. ___ starters provide 2-point acceleration

Answer:

Primary-resistor Question 21: ___ starting is achieved by increasing the motor voltage in accordance with the setting of the ramp-up control.

Answer:

Solid-state (Soft) Question 22: 4. Although more expensive, open-circuit transition is preferable to closed-circuit transition because closed-circuit transition does not cause a high-current transition surge. True or False

Answer:

False Question 23: 9. When calculating the voltage in the coil for a wye-connected circuit, the voltage is equal to the line voltage divided by ___.

Answer:

1.73 Question 24: 8. The least expensive reduced-voltage starting method is ___ starting.

Answer:

part-winding Question 25: 12. A ___ is often used to short out the soft starter of a running motor.

Answer:

bypass contactor