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16 Cards in this Set

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  • Back

What is the most common type of AC waveform?

Sine waves are produced by all rotating machines.

How many degrees are there in one complete sine wave?

There are 360 degrees in one complete sine wave.

At what angle does the voltage reach its maximum negative value on a sine wave?

270 degree of maximum negative negative value on a sine wave.

What is frequency?

a complete cycle occurs in one second (Hz). Ex. a 60 Hz equals 60 sine waves in one second.

A sine wave has a maximum value of 230 V. What is the voltage after 38˙ of rotation?

Ei = Em x sine


= 230 v x sin 38


= 230 v x .61566


= 141.60 v

A sine wave has a voltage of 63 V after 22˙ of rotation. What is the maximum voltage reached by this wavefrom?

Ei = Em x sine


Em = Ei / sine


= 63 v / sine 22


= 168.1 v



A sine wave has a maximum value of 560 V. At what angle of rotation will the voltage reach a value of 123 V

Ei = Em x sine


sine = Ei x Em


= 123 / 560


= .2196


a sine= 12.68

A sine wave has a peak value of 433 V. What is the RMS value?

RMS = peak x .0707


= 433 x .707


= 30.31 v



A sine wave has a peak to peak value of 88 V. What is the average value.

avg = peak x .637


= 88 x .637


= 56.05v

A DC voltage has a average value of 68 V. What is the RMS value?

avg = rms x .9


rms = avg /.9


= 68 / .9


= 61.2

fill in the missing value?


Pv Iv Deg


347 208 ?




Ei = Em x sine


Ei = Em x sine


sine = Ei / Em


= 280 / 347


= .5994


asine = 36.82 deg

fill in the missing value?


Pv Iv Deg


780 ? 43.5




Ei = Em x sine


Ei = Em x sine


= 780 x sine 43


= 536.91v

fill in the missing value?


Pv Iv Deg


? 24.3 17.6




Ei = Em x sine


Ei = Em x sine


Em = Ei / sine


= 24.3 / sine 17.6


= 24.3 / .30236


= 80.36 v

fill in the missing value?


P RMS Full wave


12.7 ? ?



Peak = RMS x 1.414


Avg = Peak x .637


Avg = RMS x .9


Peak = RMS x 1.414


RMS = Peak / 1.414


= 12.7 / 1.414


= 8.981


then


Avg = Peak x .637


= 12.7 x .637


= 8.089


fill in the missing value?


P RMS Full wave


? 53.8 ?



Peak = RMS x 1.414


Avg = Peak x .637


Avg = RMS x .9


Peak = RMS x 1.414

= 53.8 x 1.414


= 76.07


then


Avg = Peak x .637


= 76.07 x .637


= 4.84

fill in the missing value?


P RMS Full wave


? ? 164.2



Peak = RMS x 1.414


Avg = Peak x .637


Avg = RMS x .9


Avg = Peak x .637


Peak = Avg / .637


= 164.2 / .637


= 257.77


then


Peak = RMS x 1.414


RMS = Peak x 1.414


= 182.29