Circuit Theory – Multiple Choice Questions (MCQs)

1. 13. An inductor stores energy in the form of:

   • A. Electric field
   • B. Magnetic field
   • C. Kinetic energy
   • D. Heat

2. 14. The unit of inductance is:

   • A. Farad
   • B. Ohm
   • C. Henry
   • D. Siemens

3. 15. Which element opposes sudden changes in current?

   • A. Resistor
   • B. Capacitor
   • C. Inductor
   • D. Diode

4. 16. Which element opposes sudden changes in voltage?

   • A. Resistor
   • B. Capacitor
   • C. Inductor
   • D. Transistor

5. 17. What is the formula for calculating total resistance in a series circuit?

   • A. R_total = R1 * R2 / (R1 + R2)
   • B. R_total = R1 + R2 + ...
   • C. R_total = 1/R1 + 1/R2 + ...
   • D. R_total = sqrt(R1^2 + R2^2)

6. 18. What is the formula for calculating total resistance in a parallel circuit?

   • A. R_total = R1 + R2 + ...
   • B. R_total = R1 * R2 / (R1 + R2) (for two resistors)
   • C. R_total = sqrt(R1^2 + R2^2)
   • D. R_total = R1 - R2

7. 19. The peak value of an AC voltage is 100V. What is its RMS value?

   • A. 70.7 V
   • B. 100 V
   • C. 141.4 V
   • D. 50 V

8. 20. The RMS value of a sinusoidal AC current is 10A. What is its peak value?

   • A. 7.07 A
   • B. 10 A
   • C. 14.14 A
   • D. 5 A

9. 21. What is "impedance" in an AC circuit?

   • A. The total opposition to current flow
   • B. The resistance only
   • C. The reactance only
   • D. The conductance

10. 22. The unit of impedance is:

    • A. Farad
    • B. Henry
    • C. Ohm
    • D. Siemens

11. 23. What is "reactance"?

    • A. The opposition to current flow offered by resistors
    • B. The opposition to current flow offered by capacitors and inductors
    • C. The total opposition to current flow
    • D. The flow of current

12. 24. What is "admittance"?

    • A. The reciprocal of resistance
    • B. The reciprocal of impedance
    • C. The reciprocal of reactance
    • D. The reciprocal of conductance