# MCQs on Electrical Circuit Theory

1. A passive element in a circuit is one which
(a) supplies energy.
(c) both supplies and receives energy.
(d) none of the above.

2. Which of the following statement is true about a linear circuit
(a) parameters changes with change in voltage.
(b) parameters changes with change in current.
(c) parameter do not changes with voltage and current.
(d) none of the above.

3. The superposition theorem is used when the circuit contains
(a) passive elements only.
(b) active elements only.
(c) a single voltage source.
(d) a number of voltage source.

4. Which of the following theorem is used for the analysis of a vacuum tube circuit?
(a) Thevenin’s theorem.
(b) Superposition theorem.
(c) Norton’s theorem.
(d) none of the above.

5. Which of the following is a neutral magnet?
(a) steel.
(b) lomestone.
(c) soft iron.
(d) magnesia.

6. At which point of a magnet, the intensity of magnetic lines of force is maximum?
(a) south pole.
(b) north pole.
(c) magnetic pole.
(d) unit pole.

7. The ability of a material to conduct magnetic flux through it is known as
(a) permeability.
(b) conductivity.
(c) permittivity.
(d) reluctivity.

8. The current of electric circuit is analogous to which of the magnetic circuit?
(a) flux density.
(b) mmf.
(c) flux.
(d) magnetic intensity.

9. At series resonance, the voltage across capacitor or inductor is
(a)zero.
(b) equal to supply voltage.
(c) quality factor times the supply voltage.
(d) power factor times the supply voltage.

10. The curve between frequency and current is known as
(a) voltage curve.
(b) power curve.
(c) resonance curve.

11. Which of the following circuit element stores energy in the electromagnetic field ?
(a) Inductance.
(b) Condenser.
(c) Variable resistor.
(d) Resistance.

12. The principle of dynamically induced emf is utilised in a
(a) choke.
(b) transformer.
(c) generator.
(d) thermo-couple.

13. A crack in the magnetic path of an inductor will result in
(a) unchanged inductance.
(b) increased inductance.
(c) zero inductance.
(d) reduced inductance.

14. The principle of statically induced emf is utilised in a
(a) motor.
(b) transformer.
(c) generator.
(d) battery.

15. Power factor of an inductive circuit is generally improved by connecting a capacitor in
(a)parallel.
(b) series.
(c) either parallel or series.
(d) none of the above.

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