The percentage or fraction of time that the system is transmitting a pulse.

• A. Duty factor
• B. Pulse duration
• C. Pulse repetition period
• D. Duty cycle

Answer: (A)

The main idea is the fraction of time the transmitter is actively sending a pulse during each cycle. That quantity is described by the duty factor. It’s found by dividing the time the system is on (the pulse duration) by the total time of one cycle (the pulse repetition period). Expressed as a percentage, duty factor = pulse duration / pulse repetition period × 100. In many contexts this same concept is called duty cycle, but for this item the term used is duty factor. The pulse duration is just how long a single pulse lasts, and the pulse repetition period is the full interval from the start of one pulse to the start of the next. So the fraction of time spent transmitting is captured by the duty factor.