A square wave has a period of 60 µs. The first odd harmonic is
A. 5 kHz
B. 50 kHz
C. 500 kHz
D. 33.33 kHz
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Periodic is characterized by a repetition at fixed time intervals.
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The designation rms means repetitions measured per second.
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A saw-tooth wave has a period of 10 ms. Its frequency is
A. 10 Hz
B. 50 Hz
C. 100 Hz
D. 1,000 Hz
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The average value of a 12 V peak sine wave over one complete cycle is
A. 0 V
B. 1.27 V
C. 7.64 V
D. 6.37 V
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The duty cycle of a pulse waveform with a pulse width of 10 µs and a period of 100 µs is 25%.
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If the rms voltage drop across a 15 kΩ resistor is 16 V, the peak current through the resistor is
A. 15 mA
B. 1.5 mA
C. 10 mA
D. 1 mA
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The angular position of a phasor represents the angle of the sine wave with respect to a reference.
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The unit of frequency is the hertz.
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How many degrees are there in p/3 rad?
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If the rms current through a 6.8 kΩ resistor is 8 mA, the rms voltage drop across the resistor is
A. 5.44 V
B. 54.4 V
C. 7.07 V
D. 8 V
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If the rms current through a 4.7 kΩ resistor is 4 mA, the peak voltage drop across the resistor is
A. 4 V
B. 18.8 V
C. 26.6 V
D. 2.66 V
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A pulse waveform has a high time of 8 ms and a pulse width of 32 ms. The duty cycle is
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The length of a phasor represents the amplitude.
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One sine wave has a positive-going zero crossing at 15° and another sine wave has a positive-going zero crossing at 55°. The phase angle between the two waveforms is
A. 0°
B. 45°
C. 40°
D. None of the above
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Duty cycle is the characteristic of a pulse waveform that indicates the high time versus the low time.
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A 20 kHz pulse waveform consists of pulses that are 15 µs wide. The duty cycle
A. Is 1%
B. Is 30%
C. Is 100%
D. Cannot be determined
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