# Electrical Engineering - Alternating Current and Voltage

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

16.

Two series resistors are connected to an ac source. If there are 7.5 V rms across one resistor and 4.2 V rms across the other, the peak source voltage is

 A. 16.54 V B. 1.65 V C. 10.60 V D. 5.93 V

Explanation:

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17.

If a sine wave goes through 10 cycles in 20 s, the period is

 A. 20 s B. 4 s C. 2 s D. 100 s

Explanation:

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18.

A square wave has a period of 60 s. The first odd harmonic is

 A. 5 kHz B. 50 kHz C. 500 kHz D. 33.33 kHz

Explanation:

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19.

Sine wave A has a positive-going zero crossing at 45°. Sine wave B has a positive-going zero crossing at 60°. Which of the following statements is true?

 A. Wave A leads wave B by 15°. B. Wave A lags wave B by 15°. C. Wave A leads wave B by 105°. D. Wave A lags wave B by 105°.

Explanation:

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20.

A phasor represents

 A. the magnitude and a quantity direction B. the width of a quantity C. the phase angle D. the magnitude of a quantity