EE321 Exam 2
Spring 2009
Notes
: Write your name and ID on blue book.
This part of exam will be recycled.
You must show work for credit, except for problem 1.
A score of 60% on this exam satisfies ABEST objectives 1,2,4, and 5.
Good luck !
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The following questions should be answered true or false.
They are worth 2 pts.
each.
You do not need to show work.
1a)
3
,
cr
N
describes the number of turns around slot 3 of the c-phase of the rotor.
1b) The number of poles can be found from the winding function
1c) A pm dc machine cannot be connected directly to an ac source and expected to
operate
1d) A series connected dc machine cannot be connected directly to an ac source and
expected to operate
1e) DC machines would be a poor choice for use in a petroleum plant
1f) Conduction losses limit switching frequency
1g) A two-quadrant converter eliminates discontinuous mode
1h) A pm dc machine has a smaller operating range in terms of capability curve than a
separately excited machine with the same maximum torque capability.
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- Spring '08
- Staff
- Electric motor, pm dc machine, variable reluctance stepper, ABEST
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