26. The form factor of dc voltage is ________.
(a) zero
(b) infinite
(c) unity
(d) 0.5
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
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
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
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
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