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# AC Fundamentals – 1 – 5

21. One sine wave has a period of 2 ms, another has a period of 5 ms, and other has a period of 10 ms. Which sine wave is changing at a faster rate ?

(a) sine wave with period 2 ms
(b) sine wave with period of 5 ms
(c) all are at all same rate
(d) sine wave with period of 10 ms

Explanation
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22. If the peak value of a certain sine wave voltage is 5 V, what is the rms value ?

(a) 0.707 V
(b) 3.535 v
(c) 5 V
(d) 1.17 v

Explanation
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23. A sine wave has a positive going zero crossing at 00 and an rms value of 20 V. What is its instantaneous value at 1450 :

(a) 7.32 V
(b) 16.22 V
(c) 26.57 V
(d) 21.66 V

Explanation
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24. In a pure capacitor, the voltage :

(a) is in phase with the current
(b) is out of phase with the current
(c) lags behind the current by 900
(d) leads the current by 900

Explanation
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25. The rms value of the voltage for a voltage function υ = 10 + 5cos(628t+300) volts through a circuit is :

(a) 5 V
(b) 10 V
(c) 10.6 V
(d) 15 V