# MCQs on Electrical Circuit Theory

1. When the supply frequency of an AC circuit is  increases, its inductive reactance is
(a) decreases.
(b) increases.
(c) remain same.
(d) none of the above.

2. If the inductance of a resonant circuit increases, its quality factor is
(a) increases.
(b) decrease.
(c) remain same.
(d) none of the above.

3. If the resistance of a resonant circuit increases, its quality factor
(a) increases.
(b) decrease.
(c) remains same.
(d) none of the above.

4. In RC series AC circuit
(a) applied voltage lag capacitor voltage.
(b) applied voltage lead capacitive voltage.
(c) applied voltage leads resistor voltage circuit.
(d) current is in phase with applied voltage.

5. When 10 bulbs are operating in parallel in a AC circuit, if two additional bulb are operated in parallel with these bulbs, the effective resistance of circuit is
(a) increases.
(b) decreases.
(c) remain same.
(d) none of the above.

6. A voltmeter must always connected in
(a) series.
(b) parallel.
(c) series-parallel.
(d) any of the above.

7. In a series circuit which of the following quantity remains same?
(a) current.
(b) voltage.
(c) both current and voltage.
(d) none of the above.

8. An electric bulb is rated as 100 watt, 230 V AC. The 230 V indicates the
(a) average value.
(b) maximum value.
(c) r.m.s value.
(d) mean value.

9. The power consumed by circuit element is minimum when phase angle between current and voltage is
(a) 0°.
(b) 45°.
(c) 90°.
(d) 180°.

10. Does a wattmeter measure the reactive power of an AC circuit?
(a)yes.
(b) no.
(c) sometime.
(d) none of the above.

11. An ammeter is always connected in
(a)series.
(b) parallel.
(c) series-parallel.
(d) none of the above.

12. Kirchoff’s second law is based on the law of conservation of
(a)mass.
(b) momentum.
(c) charge.
(d) energy.

13. Kirchoff’s first law is based on the law of conservation of
(a)charge.
(b) mass.
(c) energy.
(d) temperature.

14. An incandescent lamp can walk on work on
(a)DC only.
(b) AC only.
(c) both AC and DC.
(d) none of the above.

15. Which of the following waveform have highest r.m.s value, when all have same speak value
(a)triangular wave.
(b) sine wave.
(c) sawtooth wave.
(d) square wave.

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