Sentences.A 1This type regulator is for 2 When magnetic fields of alternating polarity passacross the armature windings, 3 Control of the voltage induced into the ac generator windings depends 4 The number of turns per winding and the number of windings are 5 The frequency of the output voltage depends 6 The strength of the magnetic field controls 7 In some cases, as in tachometer generators, a permanent magnet field maintains 8 In today’s aircraft, electrical and electronic equipment operate 9 Systems exposed to extreme overvoltages or off-frequencies not only destroy themselves, 10 Ac generator control systems must contain circuits 11 Some brushless generators use 12 On the brushless generator, the rotating three-phase rectifiers change B a the ac output of the exciter to dc. b permanent magnets in the exciter circuits. c to protect against undervoltage and overvoltage, underfrequency and overfrequency, and improper phase sequence. d but may start a fire during an emergency. e at exact frequencies and voltages. f the load at a constant value. g the level of output voltage. h on the speed of the generator. i set during generator manufacture. j on three things. k ac voltage induction occurs. l use with both acand direct current (dc) power sources.
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