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Electrical_Power_Drivers-_ET3026WB-Chapt17_example_questions

Electrical_Power_Drivers-_ET3026WB-Chapt17_example_questions...

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Questions from the same exercise can be combined together to increase difficulty. Statement questions can be mixed together (or maybe changed from false to true or opposite) as soon as there is only one false statement per question! mine Which one of the following statements about synchronous motors is NOT true? a) Synchronous motors are identical in construction to salient pole ac generators. b) The stator winding of a synchronous motor is identical to the stator winding of a 3 phase induction motor. c) The salient poles of a synchronous motor are excited by ac current. d) A damper winding serves to start the synchronous motor. mine Which one of the following statements about synchronous motors is NOT true? a) Modern synchronous motors use brushless rotor excitation. b) Rotor and stator of a synchronous motor can NEVER have the same number of poles. c) A synchronous motor operating at 60Hz, running at 200rpm has 36 poles. d) Synchronous motors can use a small 3phase generator to excite their rotor. mine Which one of the following statements about synchronous motors is NOT true? a) Synchronous motors can start by themselves. b) Synchronous motors are usually equipped with a squirrel cage winding. c) The dc excitation is suppressed during the start up period. d) Very large synchronous motors are usually brought up to speed by pony motors. mine Which one of the following statements about synchronous motors is NOT true?
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