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AC Fundamentals – 1 – 6

26. The form factor of dc voltage is :

(a) zero
(b) infinite
(c) unity
(d) 0.5

Explanation
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27. The voltage wave consists of two components : a 50 V dc component and a sinusoidal component with a maximum value of 50 volts. The average value of the resultant will be :

(a) zero
(b) 86.6 V
(c) 50
(d) none of the above

Explanation
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28. The current in a pure inductor :

(a) lags behind the voltage by 900
(b) leads the voltage by 900
(c) is in phase with the voltage
(d) lags behind the voltage by 450

Explanation
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29. A sinusoidal current has peak value of 12 A. What is its average value ?

(a) 7.64 A
(b) 24 A
(c) 8.48 A
(d) 12 A

Explanation
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30. A sine wave voltage is applied across an inductor, when the frequency of voltage is increased, the current :

(a) increases
(b) decreases
(c) remains the same
(d) is zero