Siemens DTU3005-B Dokumentacja Pobierz pdf (Strona 21)

Review 2

1. ____________ is a measurement of the number of

alternations between positive and negative peak values

in a measured amount of time.

a. voltage

b.current

c. frequency

d.power

2) The peak-to-peak value of an AC voltage with a peak

voltage of 600 volts is ____________ .

3) The instantaneous voltage measured at 120° of a sine

wave with a peak voltage of 650 volts is ___________ .

4) The most common method of expressing the value of

AC voltage and current is ____________ value.

a. average

b.effective

c. peak

d.instantaneous

5) A pure sinusoidal waveform has a crest factor of

____________ .

6) Computer equipment is most vulnerable during a Type I

overvoltage disturbance and a Type ____________

undervoltage disturbance.

a. I

b.II

c. III

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Siemens DTU3005-B Dokumentacja Strona 21