[開課學院]: 資電學院
[開課系所]: 電機系
[課程名稱]: 電機機械(一)
[老師名稱]: 張正泓 老師
[開課學期]: 98-1
[類型]: 98-1期末考
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[1]How do you utilize choke core ? Sketch the wiring diagram .
[2]Under what conditions will the unbalanced loading become effective ?
[3]How do you convert 380 V ,3-phase,3-wire,to 3-phase,4-wire,190/110V system?
[4]What are the reasons that electrical rotating machines are made as
cylindrical machines?
[5]Three-phase transformer systems are frequently designed as delta-wye,neutrl
grounded system.Give your comments.
[6]Under what conditions will the neutral line of a wye-connected power system
flow not only third harmonic currents?
[7]Three sets of single-phase,100 kVA,3300/230 V transformers are connected to
form a three-phase inside delta-connected autotransformer. The power source
is 3530 V.
(a)Calculatesecondary line voltage of this autotransformer.
(b)Calculate the capacity of this three-phase autotransformer.
[8]A two-couple winding system has the fixed winding and the movable winding.
The self inductances of both winding are L and M ,respectively.The mutual
inductance between the windings is Fcosθ.Assume both windings flow the same
currents of Imaxsinωt on them.
(a)What kind of the rotating machine this system belongs to ?
(b)Calculate the torque to be developed on the movable winding.
[9]Give your comments and advice on this course.
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