# Chapter 4: Complex AC Circuits

1. The area of a sinusoidal wave over a half-cycle is
max. value + π

2. Alternating voltages and currents are expressed in r.m.s. values because

3. The average value of sin²θ over a complete cycle is

A.

4. The form factor of a sinusoidal wave is

5. Each of the three coils generates an e.m.f. of 230 V. The e.m.f. of second leads that of the first by 120? and the third lags behind the first by the same angle. The resultant e.m.f. across the series combination of the coils is
...

6. In a pure resistive circuit, the instantaneous voltage and current are given by : v = 250 sin 314t volts i = 10 sin 314 t amperes The peak power in the circuit is

7. Power absorbed in a pure inductive circuit is zero because

8. An alternating voltage v = Vm sin 0 is applied to a pure capacitive circuit. The current equation will be
sin ( /2)
sin ( + /4)
sin ( + /2)

9. A 500 V sine wave generator appears across a 10 kΩ resistor. What is the instantaneous current in the resistor at a phase angle of 35°?

10.  An electric bulb rated at 220 V is connected to 220 V, 5 Hz a.c. source. Then the bulb

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