1. Ohm’s law is not applicable to
(a) high voltage.
(b) high current.
(c) DC circuits.
(d) semiconductor. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] D [/accordion-item][/accordion]
2. The power factor of pure inductive circuit is
(a) zero.
(b) positive.
(c) negative.
(d) unity. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] A [/accordion-item][/accordion]
3. Which of the following bridge is used to measure low resistance?
(a) Wein bridge.
(b) Wheat stone bridge.
(c) Kelvin bridge.
(d) None of the above. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] C [/accordion-item][/accordion]
4. Which of the following is generally used to made a voltage dependent resistor?
(a) phosphorus.
(b) silicon carbide.
(c) carbon.
(d) nichrome. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] B [/accordion-item][/accordion]
5. At what temperature the resistivity of mercury is zero?
(a) 270 K
(b) 180 K
(c) 4 K
(d) 100 K [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] C [/accordion-item][/accordion]
6. For drawing vector diagram for a series circuit, the reference vector is
(a) current.
(b) voltage.
(c) resistance.
(d) reactance. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] A [/accordion-item][/accordion]
7. As the frequency increases, wavelength of signal is
(a) increases.
(b) decreases.
(c) remains same.
(d) none of the above. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] B [/accordion-item][/accordion]
8. AC ammeter and voltmeter generally determine the
(a) maximum value.
(b) average value.
(c) r.m.s. value.
(d) peak to peak value. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] C [/accordion-item][/accordion]
9. In a series resonant circuit, the impedance of the circuit is
(a) minimum.
(b) zero.
(c) maximum.
(d) infinite. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] A [/accordion-item][/accordion]
10. The power factor of series resonant circuit is
(a) zero.
(b) unity.
(c) 0.65.
(d) none of the above. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] B [/accordion-item][/accordion]
11. The main purpose of using voltage dependent resistor in a circuit is to
(a) limit the current.
(b) avoid overheating.
(c) suppress surge.
(d) provide variable voltage. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] C [/accordion-item][/accordion]
12. Resistance of a wire is ” r ” ohm. The wire is stretched to double its length, then its resistance in ohm is
(a) r/2.
(b) 4r.
(c) 2r.
(d) r/4. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] B [/accordion-item][/accordion]
13. If an electric current of 6 amp flow in a circuit, it is the same as
(a) 6 Coulomb/sec.
(b) 6 watt/sec.
(c) 6 joule/sec.
(d) 6 volt/sec. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] A [/accordion-item][/accordion]
14. When the supply frequency of an AC circuit increases, its capacitive 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] A [/accordion-item][/accordion]
15. As the temperature of NTC thermistor increases, its resistance
(a) decreases.
(b) increases.
(c) remain same.
(d) none of the above. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] A [/accordion-item][/accordion]