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Multiple Choice Quiz
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1
Direct current periodically changes the direction in which it is flowing.
A)True
B)False
2
Electronic music is created by producing and mixing together a wide variety of waveforms.
A)True
B)False
3
The most common way of specifying the amount of alternating current is by stating its peak value.
A)True
B)False
4
It is easier to transform alternating current from one voltage level to another than to transform direct current.
A)True
B)False
5
One advantage of a three-phase system is that it provides a more constant load on the generator.
A)True
B)False
6
Which of the following does not affect the output voltage of an ac generator?
A)the number of turns in the armature coils
B)the conductor size
C)the speed at which the coils rotate
D)the flux density of the magnetic field
7
Which of following is not a major characteristic of the balanced wye-connected three phase system?
A)the phase and line currents are equal
B)the line current is 1.732 times greater than the phase current
C)the line voltage is 1.732 times greater than the phase voltage
D)the line voltage and phase voltage are separated by 30°
8
That part of a waveform that does not repeat or duplicate itself is called a
A)period
B)sinusoid
C)fluctuation
D)cycle
9
Which of the following does not affect the flux cut per unit of time?
A)the speed of the conductor
B)the size of the conductor
C)the flux density
D)the angle at which the conductor crosses the magnetic flux
10
The algebraic sum of the instantaneous phase voltages is equal to
A)the peak phase voltage
B)the peak-to-peak phase voltage
C)the effective phase voltage
D)zero





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