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Motors ch 11

Starting

QuestionAnswer
1. ___ starters provide very smooth starting due to increasing voltage across the motor terminals as the motor accelerates primary-resistor
2. Magnetic motor starters include __- that detect excessive current passing through a motor and are used to switch all types and sizes of motors. overload relays
3. Motors that are started at reduced voltage must be switched to line voltage before they can reach full speed. True or False True
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 False
5. Reduced-voltage starting must be applied to DC motors larger than ___HP in order to prevent motor damage. 1hp
6. In wye-delta starting, a motor starter is started with approximately ___ of the normal voltage and develops approximately 33% of the normal torque. 58%
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. 400
8. The least expensive reduced-voltage starting method is ___ starting. part-winding
9. When calculating the voltage in the coil for a wye-connected circuit, the voltage is equal to the line voltage divided by ___. 1.73
10. ___ starting devices are small, durable, and have no contacts. solid-state
11. Most soft starters have gradual stopping capabilities. True or False True
12. A ___ is often used to short out the soft starter of a running motor. bypass contactor
13. For a ___ motor, the voltage to the winding is less than the line voltage. wye-connected
14. ___ motors are usually special-order motor. Wye-delta
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 True
16. ___ starters provide 2-point acceleration Primary-resistor
17. ____ starting is not a method of reduced-voltage starting. Line-voltage
18. External resistance is added to and taken away from the motor circuit in a(n) ___ starting circuit. primary-resistor
19. Part-winding starting should be applied to all motors. True or False False
20. ___ starting produces less starting torque than full voltage. Part-winding
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. autotransformer
___ starting is achieved by increasing the motor voltage in accordance with the setting of the ramp-up control. Solid-state (Soft)
23. Both solid-state starting and ___ starting methods are adjustable. primary-resistor
24. Using the illustration, identify the DC motor starting circuits as series, shunt, and compound. See page 56 workbook. A = series b = shunt, c = compound
25. read question on page 57 workbook Closed
Created by: JoshHampton
 

 



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