AP ECET ELECTRONICS AND COMMUNICATION ENGINEERING (ECE) Multiple Choice Questions (MCQs)

AP ECET Circuit Theory Questions

1. 16. The mesh current method in circuit analysis is based on:
   • A) Kirchhoff’s Voltage Law (KVL)
   • B) Kirchhoff’s Current Law (KCL)
   • C) Crammer’s Rule
   • D) Ohm’s Law
   Answer: A
2. 17. The primary use of Crammer's Rule in network analysis is to:
   • A) Solve non-linear circuits
   • B) Solve simultaneous linear equations
   • C) Find the total current in the circuit
   • D) Simplify complex circuits
   Answer: B
3. 18. Thevenin’s Theorem states that any linear network with voltage and current sources can be simplified to:
   • A) A single voltage source and a single resistor in series
   • B) A single current source and a single resistor in parallel
   • C) A voltage source in parallel with a load
   • D) A current source in series with a load
   Answer: A
4. 19. According to Norton’s Theorem, a network can be simplified to:
   • A) A voltage source and series resistor
   • B) A current source and parallel resistor
   • C) A voltage source and parallel resistor
   • D) A current source and series resistor
   Answer: B
5. 20. Maximum Power Transfer Theorem states that the maximum power is transferred when:
   • A) Load resistance is zero
   • B) Load resistance equals the source resistance
   • C) Source resistance is infinite
   • D) Load resistance is infinite
   Answer: B
6. 21. The Superposition Theorem is used to analyze circuits with:
   • A) Multiple resistors
   • B) Multiple power sources
   • C) Inductive elements only
   • D) Capacitive elements only
   Answer: B
7. 22. The Reciprocity Theorem states that the current in a branch due to a source is the same as when:
   • A) The source and load are interchanged
   • B) The source is turned off
   • C) The load is at the same voltage
   • D) The source is connected in parallel
   Answer: A
8. 23. The Q-factor of a resonance circuit is defined as the ratio of:
   • A) Inductance to capacitance
   • B) Resistance to reactance
   • C) Stored energy to dissipated energy
   • D) Power to voltage
   Answer: C
9. 24. In the case of series resonance, the impedance is:
   • A) Zero
   • B) Maximum
   • C) Minimum
   • D) Infinite
   Answer: C
10. 25. The bandwidth of a resonance circuit is inversely proportional to:
    • A) Q-factor
    • B) Impedance
    • C) Frequency
    • D) Voltage
    Answer: A
11. 26. The main characteristic of linear wave shaping circuits is:
    • A) They smooth the waveform
    • B) They distort the waveform
    • C) They amplify the waveform
    • D) They maintain the shape of the input waveform
    Answer: D
12. 27. The characteristic impedance of a transmission line is given by the square root of:
    • A) L/C
    • B) C/L
    • C) R/L
    • D) L/R
    Answer: A
13. 28. The Reflection Coefficient in a transmission line is defined as the ratio of:
    • A) Reflected voltage to incident voltage
    • B) Reflected current to incident current
    • C) Incident voltage to reflected voltage
    • D) Incident power to reflected power
    Answer: A
14. 29. The Standing Wave Ratio (SWR) is defined as the ratio of:
    • A) Maximum voltage to minimum voltage
    • B) Incident voltage to reflected voltage
    • C) Reflected current to transmitted current
    • D) Power delivered to a load to power lost
    Answer: A
15. 30. Impedance matching in transmission lines is used to:
    • A) Minimize signal loss
    • B) Increase reflection
    • C) Increase bandwidth
    • D) Decrease the voltage
    Answer: A

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