In a 60 Hz AC system, what is the duration in seconds for one complete cycle?

Correct Answer: Option D — .016 of a second

Frequency in hertz represents cycles per second. The duration of one complete cycle is the reciprocal of the frequency ($1 / 60$). Calculating $1 / 60$ yields approximately 0.0166 seconds, matching standard 60 Hz marine generator operating characteristics governed by IEEE 45.