# Electrical Engineering - Alternating Current and Voltage

### Exercise :: Alternating Current and Voltage - General Questions

11.

A signal with a 400 s period has a frequency of

 A. 250 Hz B. 2,500 Hz C. 25,000 Hz D. 400 Hz

Explanation:

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12.

A sine wave of 15 kHz is changing at a faster rate than a sine wave with a frequency of

 A. 25 kHz B. 12 kHz C. 18 kHz D. 1.3 MHz

Explanation:

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13.

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

Explanation:

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14.

When a sine wave has a frequency of 100 Hz in 12 s it goes through

 A. 1/100 cycle B. 12 cycles C. 120 cycles D. 1,200 cycles

Explanation:

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15.

A sawtooth wave has a period of 10 ms. Its frequency is

 A. 10 Hz B. 50 Hz C. 100 Hz D. 1,000 Hz