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MCQs on Electrical Circuit Theory

April 6, 2017 by admin

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 1. Ohm’s law is not applicable to
(a) high voltage.
(b) high current.
(c) DC circuits.
(d) semiconductor.    

Answer

           D 

 2. The power factor of pure inductive circuit is
(a) zero.
(b) positive.
(c) negative.
(d) unity. 

Answer

           A 

 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. 

Answer

           C 

 4. Which of the following is generally used to made a voltage dependent resistor?
(a) phosphorus.
(b) silicon carbide.
(c) carbon.
(d) nichrome.   

Answer

           B 

 5. At what temperature the resistivity of mercury is zero?
(a) 270 K
(b) 180 K
(c) 4 K
(d) 100 K 

Answer

           C 

 6. For drawing vector diagram for a series circuit, the reference vector is
(a) current.
(b) voltage.
(c) resistance.
(d) reactance. 

Answer

           A 

 7. As the frequency increases, wavelength of signal is
(a) increases.
(b) decreases.
(c) remains same.
(d) none of the above. 

Answer

           B 

  8. AC ammeter and voltmeter generally determine the
(a) maximum value.
(b) average value.
(c) r.m.s. value.
(d) peak to peak value. 

Answer

           C 

 9. In a series resonant circuit, the impedance of the circuit is
(a) minimum.
(b) zero.
(c) maximum.
(d) infinite. 

Answer

           A 

  10. The power factor of series resonant circuit is
(a) zero.
(b) unity.
(c) 0.65.
(d) none of the above. 

Answer

           B 

 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. 

Answer

           C 

You may also read
• Why all the voltage levels are multiples of 11 kV?
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 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. 

Answer

           B 

 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.  

Answer

           A 

 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. 

Answer

           A 

 15. As the temperature of NTC thermistor increases, its resistance
(a) decreases.
(b) increases.
(c) remain same.
(d) none of the above. 

Answer

           A 

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