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. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] B [/accordion-item][/accordion]
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. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] A [/accordion-item][/accordion]
3. If the resistance of a resonant circuit increases, its quality factor
(a) increases.
(b) decrease.
(c) remains same.
(d) none of the above. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] B [/accordion-item][/accordion]
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. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] B [/accordion-item][/accordion]
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. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] B [/accordion-item][/accordion]
6. A voltmeter must always connected in
(a) series.
(b) parallel.
(c) series-parallel.
(d) any of the above. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] B [/accordion-item][/accordion]
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. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] A [/accordion-item][/accordion]
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. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] C [/accordion-item][/accordion]
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°. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] C [/accordion-item][/accordion]
10. Does a wattmeter measure the reactive power of an AC circuit?
(a)yes.
(b) no.
(c) sometime.
(d) none of the above. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] B [/accordion-item][/accordion]
11. An ammeter is always connected in
(a)series.
(b) parallel.
(c) series-parallel.
(d) none of the above. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] A [/accordion-item][/accordion]
12. Kirchoff’s second law is based on the law of conservation of
(a)mass.
(b) momentum.
(c) charge.
(d) energy. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] D [/accordion-item][/accordion]
13. Kirchoff’s first law is based on the law of conservation of
(a)charge.
(b) mass.
(c) energy.
(d) temperature. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] A [/accordion-item][/accordion]
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. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] C [/accordion-item][/accordion]
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. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] D [/accordion-item][/accordion]