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