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Alternating Current and Voltage
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What is the average voltage when a rectangular wave's base line voltage is 20 V, its peak-to-peak voltage is 50 V, and its duty cycle is 20%
40 V
45 V
26 V
30 V
Increasing the number of magnetic poles in a basic generator will ___
decrease the generator's output voltage amplitude
decrease the generator's output frequency
increase the generator's output frequency
increase the generator's output voltage amplitude
All periodic frequencies are derived by combining higher frequency ______________ called harmonics
square waves
pulse waves
sine waves
sawtooth waves
A peak current of 12.5 mA is equivalent to ___
a peak-to-peak value of 6.25 mA
an average value of 7.96 mA
an average value of 12.5 mA
an rms value of 25 mA
A single-phase induction motor
is self-starting
None of the above
operates at a fixed speed
is less reliable than a three-phase synchronous motor
The magnitude of an alternation that varies from zero is called its _______
attitude
Amplitude
altitude
polarity
What is the fourth harmonic of a fundamental frequency of 400 Hz
4 kHz
1.6 kHz
100 Hz
4 Hz
Calculate the positive-going slope of the waveform in the given circuit
2.5 V/ms
5 V/ms
2.5 V/s
5 V/s
The frequency of the sine wave in the given circuit equals ___
20 kHz
4 kHz
250 Hz
800 Hz
What is the peak-to-peak voltage of the waveform in the given circuit
8 V
4 V
6 v
2 v
The phase angle between the two waveforms in the given circuit equals _____
75°
45°
105°
15°
Most practical alternators generate electricity from
a magnetic field rotating around fixed windings
a coil rotating within a magnetic field
a permanent magnet rotating within a varying electromagnetic field
None of the above
What is the dc voltage of the waveform in the given circuit
8 V
2 v
6 v
4 V
If a wave has frequency of 2 Hz, it has a period of
1/2 s
2s
1s
2.5s
A rectangular wave that has a duty cycle of 50% could be called a
"c" wave
sawtooth wave
Triangular wave
Square wave
The peak voltage across R2 in the given circuit equals _____
8 V
7.2 V
8.8 V
10.18 V
If a sine wave's period equals 50 ms, its frequency equals _____
0.02 Hz
50 Hz
50 kHz
20 Hz
The frequency of the repetitive pulse waveform in the given circuit equals ___
100 Hz
125 Hz
50 Hz
500 Hz
What type of waveform is shown in the given circuit
Square wave
Sine wave
sawtooth wave
triangle wave
An rms voltage of 5 V is equivalent to ___
10 V peak-to-peak
a peak value of 5 V
an average value of 7.07 V
14.14 V peak-to-peak
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