Circuit Theory – Multiple Choice Questions (MCQs)

1. 181. The "reciprocity theorem" is applicable to circuits containing:

   • A. Only independent sources
   • B. Dependent sources
   • C. Mutual inductance
   • D. Unilateral elements

2. 182. What is "duality" in circuit theory?

   • A. The relationship between current and voltage
   • B. The concept that two circuits have the same mathematical form of their equations
   • C. The relationship between resistance and capacitance
   • D. The similarity between series and parallel circuits

3. 183. What is a "pole" in system analysis?

   • A. A frequency at which the system gain is zero
   • B. A frequency at which the system response goes to infinity
   • C. A point on the real axis
   • D. A point on the imaginary axis

4. 184. What is a "zero" in system analysis?

   • A. A frequency at which the system response goes to infinity
   • B. A frequency at which the system gain is zero
   • C. A point on the real axis
   • D. A point on the imaginary axis

5. 185. The total instantaneous power in an AC circuit is given by:

   • A. V_rms * I_rms
   • B. V_peak * I_peak
   • C. P + Q
   • D. v(t) * i(t)

6. 186. The concept of "phasors" is applicable only to:

   • A. DC circuits
   • B. Sinusoidal AC circuits
   • C. Non-linear circuits
   • D. Transient circuits

7. 187. What is a "balanced three-phase system"?

   • A. A system where phase voltages and currents are unequal
   • B. A system where the phase voltages and currents are equal in magnitude and displaced by 120 degrees electrically
   • C. A system with only two phases
   • D. A system with a single phase

8. 188. What is "symmetrical components" method used for?

   • A. Analyzing balanced three-phase systems
   • B. Analyzing unbalanced three-phase systems
   • C. Analyzing single-phase systems
   • D. Analyzing DC systems

9. 189. The "delta-wye transformation" is used to:

   • A. Convert a star connection to a delta connection
   • B. Simplify complex circuits
   • C. Analyze three-phase systems
   • D. All of the above

10. 190. What is a "coupled circuit"?

    • A. A circuit with only one inductor
    • B. A circuit containing mutually inductive elements
    • C. A circuit with no resistors
    • D. A circuit with only capacitors

11. 191. The "dot convention" for mutually coupled coils is used to indicate:

    • A. The number of turns
    • B. The polarity of mutually induced voltage
    • C. The resistance of the coils
    • D. The capacitance of the coils

12. 192. What is "network graph" in circuit theory?

    • A. A diagram showing only resistors
    • B. A topological representation of a circuit showing nodes and branches
    • C. A graph plotting voltage vs current
    • D. A graph showing power consumption