1. What qualities make the three-phase induction motor popular for industry (page 201)?
2. The speed of a three-phase induction motor is governed by the number of poles, the Hz of the power source, and the load (page 201).
3. The laminations in a 25-Hz motor core are thicker than those in a 60-Hz motor (pages 203-204).
4. A motor with a short body is a good choice for vibrating loads (page 204).
5. The three phases of a three-phase motor are separated from each other by
electrical degrees (page 205).
6. Rotating torque occurs because of time that peak power develops in each phase matches the degrees of physical separation of the phases
(pages 206-208).
7. Single-phase voltage will not start a three-phase motor (page 209).
8. A three-phase motor running on single phase will have about of its rated horsepower (pages 209-210).
9. An induction motor draws high amperes when it starts because of the high current demand of the squirrel cage rotor (page 210).
10. High (starting) amperes mean high torque (page 210).
11. The code letter is used to determine a motor’s full-load amperes
(page 213).
12. A motor’s torque value is constant as the RPM change (pages 213-214).
13. A load has torque, RPM, and horsepower requirements, whereas a motor needs only the horsepower rating that the load demands (page 214).
14. Nameplate RPM (full-load RPM) is the speed at which a motor has the most torque (page 214).
15. The design letter helps fit a motor to its load requirements (page 214).
16. The design A motor is used when nearly constant-load RPM is required (pages 214-215).
17. The design B motor is popular because it meets most load requirements, and doesn’t require high starting current (page 215).
18. The design C motor has higher torque characteristics than the design B motor (pages 215-216).
19. The design D motor draws low starting amperes and has high starting torque, but has low torque at full RPM (page 216).
20. The design D motor can handle intermittent overloads that would overheat design B or C motors (page 216).
21. All induction motors operate at exactly nameplate RPM (pages 216-217).
22. A wye-connected motor has four circuits, and the delta-connected motor has three circuits (page 217).
23. The nine-lead delta connection has one circuit of three leads and three circuits of two leads (pages 217-218).
24. A telephone keypad can be used to identify numbers on the 9-, 10-, and 12-lead connections (pages 218-219).
25. The 12-lead connection has four voltage connections, and more starting options than the 9-lead connection (pages 224-227).
26. The 12-lead connection can be used for part-winding start and other start methods (page 225).
27. Multispeed motors all have one winding (page 227).
28. Name three types of one-winding two-speed motors (pages 227-228).
29. A two-speed one-winding motor, with no load, draws less current on low speed than it does on high speed (pages 228-230).
30. A constant-horsepower motor has high torque on low speed (pages 228-229).
31. A constant-torque motor has more horsepower on speed (page 229).
a. low
b. high
5
32. A variable-torque motor has a horsepower rating similar to a constanttorque motor (pages 229-230).
33. Thro-speed two-winding motors have no internal connection between the windings (pages 230-231).
34. The multimode motors’ main feature is to save energy cost during low loading for prolonged periods of time (page 231). T
35. The multimode motor is used because it has a good power factor, and because its power can be adjusted to different load requirements (page 231).
36. The multimode motor is seldom found outside the oil industry, but would work well on an air compressor application (page 231).
37. The nine-lead motor that can be confused with the multimode motor when testing for the number of circuits is (page 232)
a. wye.
b. delta.
38. The difference between a triple-mode motor and a quadruple-mode motor is the location of the center lead in each phase (pages 233-237).
39. The DC field on a synchronous motor is used only for starting the load (page 240).
40. The amortisseur winding is a squirrel cage winding (page 240).
41. A discharge resistor is used to limit the DC field amperes (page 240).
42. High amperes are the main cause of DC field failure (pages 240-241).
43. allows the field control relay to energize the DC field (pages 240-241).
a. Lowered voltage
b. Low Hz
44. Overexciting the DC field changes the synchronous motor’s RPM (pages 241-242).
45. The synchronous motor (used to improve an industry’s power factor) has to be loaded (pages 243-244).
46. The brushless synchronous motor operates the same as the brush type (pages 243-244).
47. The synchronous three-phase motor can be converted to an alternator that produces three-phase power (page 244). 
48. The control that was formerly used to improve power factor on a synchronous motor is used to control the I-IZ in an alternator (page 244).
49. The amortisseur (squirrel cage) winding becomes a damper winding in an alternator (page 244).
50. The wound rotor motor is an induction motor (pages 244-245).
51. The three-phase winding (and controller) on the rotor of a wound rotor motor controls the motor’s torque (pages 245-247).
52. Lowering the rotor amps lowers the stator amps (pages 247-248).
53. Eliminating resistance in the rotor control too fast stresses the motor’s windings (pages 247-248).
54. The wound rotor control precisely regulates the motor’s speed even if there is no load (page 248).
55. The wound rotor motor can be reversed by interchanging its leads (page 248).
a. rotor
b. stator
56. A wound rotor motor can be used as a variable-voltage transformer or as a Hz control (page 249).
57. A brushless DC motor runs at synchronous speed (pages 249-250).
58. Servo motors are a miniature brushless DC motor (pages 251-252).
59. An unidentified nine-lead dual-voltage motor may be connected wye, delta, or multimode (page 252).
60. An unidentified three-lead three-phase motor should be test run with low voltage and limited current before trying a higher voltage (page 253).
61. Six-lead motors are the hardest to identify (pages 253-254).
62. Name the three types of one-winding two-speed motors (page 254-256).
63. It isn’t advisable to first test run an unidentified motor with full voltage (page 253).
64. Higher lead numbers indicate a higher speed winding in a two-winding two-speed motor (page 256).
65. The main purpose of the part-winding start is to reduce the starting amps (pages 256-257).
66. A two-pole motor may not start using the part-winding start method
67. The standard concentric-wound motor may not start with half its winding (pages 257-258).
68. A wye-delta-connected motor has two circuits with three leads (page 258).
69. The wye-delta start method allows more time to start a load without overheating the winding (pages 258-259).
70. Once the connection and voltage are identified, the tachometer should be the final test instrument used (at full load) (pages 259-260).
71. In the standard 12-lead motor, lead TIO is the end of the A phase, T11 is the end of the C phase, and T 12 is the end of the B phase (pages 261-262).
72. The 12-lead motor can be used for part-winding start (page 262).
73. Dual-voltage two-speed motors need 18 leads (page 263).
74. The European connection system can’t be converted to the U.S. number system without altering the internal connections (page 263).