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

ANSWER

EXPLANATION

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

ANSWER

EXPLANATION

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

ANSWER

EXPLANATION

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

ANSWER

EXPLANATION

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

ANSWER

EXPLANATION

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