NEIEP Electrical Fundamentals (360) Practice Test

Period of a 25 Hz signal?

0.04 s 0.25 s 4 s 0.4 s

Correct Answer:

0.04 s

Explanation:

Frequency is how many cycles occur each second, and the period is the time for one cycle. The period T is the reciprocal of the frequency f, so T = 1/f. For 25 Hz, T = 1/25 seconds, which equals 0.04 s. So each cycle lasts 0.04 seconds. The other numbers would correspond to different frequencies (for example, 0.25 s is a cycle time for 4 Hz, 4 s for 0.25 Hz, and 0.4 s for 2.5 Hz), not for 25 Hz.

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