# Electronics - Alternating Current vs Direct Current

### Exercise :: Alternating Current vs Direct Current - General Questions

16.

Power companies supply ac, not dc, because:

 A. it is easier to transmit ac B. there is no longer a need for dc C. dc is more dangerous D. there are not enough batteries

Explanation:

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17.

If a waveform period is determined to be 10 microseconds in duration, what is the frequency of the signal?

 A. 100 Hz B. 1000 Hz C. 10 kHz D. 100 kHz

Explanation:

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18.

The phase difference between sine waves of different frequencies is:

 A. equal to their frequency differences B. the difference in their fixed time displacement C. the same throughout time D. constantly changing

Explanation:

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19.

If a sine wave signal is 100 mV peak-to-peak, how many volts would be measured by a voltmeter?

 A. 14.14 mV B. 35.4 mV C. 63.7 mV D. 70.7 mV

Explanation:

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20.

What term expresses the frequency of a rectangular wave?

 A. Hz B. period C. PRF D. PRT