# AC Fundamentals – 51

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51. 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

Explanation
Explanation :

Duty Cycle = (time of signal active / total period of signal) * 100
Total period = 1 / frequency

Therefore,
D = t / p * 100% = f * p * 100% = 15 * 10^-6 * 20 * 10^3 * 100 = 30%.

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