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Motors ch 10

DC Motors and Generators

QuestionAnswer
1. A ___motor is a DC motor that has the field wiring connected in parallel with the armature. shunt
The interpoles are connected in series with the _____ windings. armature
3. ____ motors are used in moderate starting conditions and where constant or adjustable speed is required. shunt
4. DC shunt motors can develop about ____ % to ____ % of full-load torque upon starting. 250/300
5. With a(n) ____ shunt field, the speed can be regulated by varying the field current, the armature current, or both. self-excited
6. A ____ winding is a small series field winding that improves stability of the fields while running with reduced current in the field circuit. stabilizing field
7. DC compound motors have shared characteristics of series motors and shunt motors. True or False True
8. DC ___ motors are used mostly for special applications that require constant speed under load and high starting torque. compound
9. What are the two common DC compound motors? cumulative compound differential compound
10. DC permanenet-magnet motors use magnets and coils of wire for the field windings. True or False False
11. Negative voltage regulation occurs only with ___ generators. series
12. A DC ___ -wound generator provides a source of positive and zero voltage regulation to the load. shunt
13. A DC __ operates on the principle that voltage is induced in a coil of wire when the coil is rotated in a magnetic field. generator
14. When the power is removed, DC ___ motors provide some self-braking and produce relatively high torque at low speeds. permanent-magnet
15. ___ voltage regulation occurs when the countervoltage at no load is greater than the terminal voltage at full load Positive
16. When connected to 240V, a DC motor that has a winding resistance fo 3.2 ohms at standstill draws ___ A. 75
17. The field windings in a ____-wound generator consist of a few turns of low-resistance wire because the large load currentflows through them. series
18. An external ___ applies mechanaical torque to the armature and series field circuit, which induces voltage and current in the generator. prime mover
19. In a compound-wound generator, the series field is normally stronger than the shunt field. True or False False
20. When a DC motor connected to 235V accelerates to a speed that generates a countervoltage of 115 V, the total voltage in the motor is ___V. 120
21. A motor connected to 280 V has a resistance fo 7 ohmns. When the motor accelerates to full speed, the countervoltage is 245 V; the total voltage in the motor is 35 V and the current drawn is ___ A. 5.0
22. Connecting voltage directly to the field and armature windings of a DC motor allows the motor to produce higher torque in a smaller frame than with an AC motor. True or False True
23. Interpoles reduce sparking at the ___ of some DC motors. brushes
24. A __connects a brush to either the positive or negative terminal of the DC source. pigtail
25. The function of a(n) ___ is to keep armature windings in the correct polarity to interact with the main fields of a motor. commutator
26. The ___ rule gives the direction of motion for current-carrying wire interacting with a stationary magnetic field. right-hand motor
27. The neutral plane is ___ to the field flux when there is no current in the armature. perpendicular
28. Torque is exerted on the ___ when the plane of the armature loop is parallel to the field, and the armature loop sides are at right angles to the magnetic field. armature
29. The fields in a DC motor often change in polarity. True or False False
30. Explain how a DC motor can be reversed. 1. change the polarity of the armature winding or the field windings. 2. use a reversing motor starter 3. change the polarity of the power source on a permanent magnet DC motor
31. From the illustration, identify the type of generator as compound-wound, series-wound, or shunt-wound A = shunt parallel B = compound combination C = series
Created by: JoshHampton
 

 



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