Circuit Theory – Multiple Choice Questions (MCQs)

1. 145. What is "resonance" in an AC circuit?

   • A. The frequency at which the circuit's resistance is maximum
   • B. The frequency at which the inductive reactance equals the capacitive reactance
   • C. The frequency at which the current is zero
   • D. The frequency at which the voltage is zero

2. 146. The "bandwidth" of a resonant circuit is inversely proportional to its:

   • A. Resistance
   • B. Quality factor
   • C. Inductance
   • D. Capacitance

3. 147. What is "transient response" of a circuit?

   • A. The steady-state behavior of a circuit
   • B. The behavior of a circuit immediately after a change in input or circuit parameters
   • C. The response to DC input
   • D. The response at resonance

4. 148. What is "steady-state response" of a circuit?

   • A. The behavior of a circuit immediately after a change
   • B. The behavior of a circuit after all transients have died out
   • C. The response to pulsed input
   • D. The response to initial conditions

5. 149. The Laplace Transform is a powerful tool used in circuit analysis for:

   • A. Solving differential equations
   • B. Analyzing only DC circuits
   • C. Finding instantaneous values
   • D. Plotting waveforms

6. 150. What is "time constant" of an RC circuit?

   • A. The time it takes for the capacitor to fully charge
   • B. The time it takes for the capacitor voltage to reach approximately 63.2% of its final value
   • C. The time it takes for the capacitor to discharge completely
   • D. The time it takes for the current to reach its maximum

7. 151. What is "time constant" of an RL circuit?

   • A. The time it takes for the inductor to fully discharge
   • B. The time it takes for the current in the inductor to reach approximately 63.2% of its final value
   • C. The time it takes for the voltage across the inductor to become zero
   • D. The time it takes for the circuit to resonate

8. 152. The unit of magnetic flux is:

   • A. Tesla
   • B. Weber
   • C. Henry
   • D. Ampere

9. 153. The unit of magnetic flux density is:

   • A. Weber
   • B. Henry
   • C. Tesla
   • D. Ampere

10. 154. What is "reluctance" in a magnetic circuit?

    • A. The opposition to the establishment of magnetic flux
    • B. The ease with which magnetic flux is established
    • C. The magnetic field strength
    • D. The current flowing

11. 155. The unit of reluctance is:

    • A. Henry
    • B. Ampere-turns/Weber
    • C. Weber
    • D. Tesla

12. 156. What is "permeability"?

    • A. The ability of a material to oppose magnetic flux
    • B. The ability of a material to support the formation of a magnetic field
    • C. The strength of a magnetic field
    • D. The current flowing through a coil