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