1. The superposition theorem is applicable to which type of circuit?

a) Linear circuits
b) Non-linear circuits
c) Both a and b
d) None of the above
2. Superposition theorem can be applied to calculate which of the following?
a) Current
b) Voltage
c) Power
d) Both a and b
3. The superposition theorem states that the total current in any part of a linear
circuit is equal to the sum of currents produced by each source, considering: a)
All sources at the same time
b) Each source acting alone
c) Only voltage sources
d) Only current sources
4. In superposition theorem, while considering one source, all other independent
voltage sources should be:
a) Open-circuited
b) Short-circuited
c) Left as it is
d) Replaced with a resistor
5. While applying superposition theorem, the power dissipated in the circuit is:
a) Sum of powers due to individual sources
b) Not directly calculable using superposition theorem
c) Equal to the power due to any single source
d) Double the power of the strongest source

Thevenin’s Theorem
6. Thevenin's theorem simplifies a network to a single:
a) Voltage source and series resistance
b) Current source and parallel resistance
c) Capacitor
d) Inductor
7. The equivalent voltage in Thevenin’s theorem is known as:
a) Thevenin current
b) Thevenin impedance
c) Thevenin resistance
d) Thevenin voltage
8. To find Thevenin's equivalent voltage, all independent current sources are:
a) Open-circuited
b) Short-circuited
 c) Left unchanged
d) Replaced with resistors
9. Thevenin’s equivalent circuit is useful for analyzing:
a) Non-linear circuits
b) Complex AC circuits
c) One-port networks
d) Two-port networks
10. In Thevenin’s theorem, the load is connected across:
a) A voltage source and series impedance
b) A current source and parallel impedance
c) Two voltage sources
d) A single resistor

Norton’s Theorem
11. Norton's theorem states that any two-terminal network can be replaced by an
equivalent:
a) Voltage source in series with resistance
b) Current source in parallel with resistance
c) Capacitor and inductor
d) None of the above
12. In Norton’s equivalent circuit, the current source is in parallel with:
a) Norton’s resistance
b) Norton’s inductance
c) The original load
d) Thevenin's impedance
13. Norton's current is found by:
a) Open-circuiting the load
b) Short-circuiting the load
c) Removing the load
d) Using a voltage divider
14. The Norton equivalent resistance is the same as the:
a) Thevenin resistance
b) Norton current
c) Load resistance
d) Circuit resistance
15. Which of the following is true about Norton and Thevenin’s theorems?
a) They are entirely different
b) Norton’s theorem is applicable only for AC circuits
c) Thevenin and Norton’s theorems are duals of each other
d) None of the above
Maximum Power Transfer Theorem
16. Maximum power transfer occurs when the load resistance is equal to:
a) The source voltage
b) The source resistance
c) The total circuit resistance
d) Half the source resistance
17. The maximum power transfer theorem is mainly used in:
a) Transmission lines
b) Power supplies
c) Both a and b
d) Only linear networks
18. For maximum power transfer, the load resistance in a DC circuit should be equal
to:
a) Zero
b) The source resistance
c) Twice the source resistance
d) Infinite resistance
19. Maximum power transfer theorem is used to:
a) Increase current
b) Minimize power
c) Maximize power delivered to the load
d) Increase voltage gain
20. In AC circuits, maximum power transfer occurs when the load impedance is
equal to the:
a) Source impedance
b) Source resistance only
c) Reactive impedance of the source
d) Thevenin voltage

R-L, R-C, and R-L-C Circuits

21. In an R-L circuit, the impedance is given by:
a) Z=R+jωLZ = R + j \omega LZ=R+jωL
b) Z=R−jωCZ = R - j \omega CZ=R−jωC
c) Z=RLZ = \frac{R}{L}Z=LR
d) Z=RZ = RZ=R
22. In an R-C circuit, the phase angle between the voltage and current is:
a) 0°
b) 90°
c) Depends on the frequency
d) Depends on the inductance
 23. The time constant of an R-C circuit is defined as:
a) τ=R+C\tau = R + Cτ=R+C
b) τ=RC\tau = RCτ=RC
c) τ=RC\tau = \frac{R}{C}τ=CR
d) τ=C/R\tau = C/Rτ=C/R
24. In an R-L-C series circuit, resonance occurs when:
a) ωL=1ωC\omega L = \frac{1}{\omega C}ωL=ωC1
b) R=LR = LR=L
c) R=CR = CR=C
d) None of the above
25. At resonance in an R-L-C series circuit, the impedance is:
a) Zero
b) Infinite
c) Equal to R
d) Equal to L

Resonance in AC Series and Parallel Circuits

26. In a series R-L-C circuit, the resonant frequency is given by:
a) fr=12πLCf_r = \frac{1}{2 \pi \sqrt{LC}}fr=2πLC1
b) fr=12πRCf_r = \frac{1}{2 \pi RC}fr=2πRC1
c) fr=R2πCf_r = \frac{R}{2 \pi C}fr=2πCR
d) fr=L2πCf_r = \frac{L}{2 \pi C}fr=2πCL
27. At resonance in an AC series circuit, the circuit behaves as:
a) A purely resistive circuit
b) A purely inductive circuit
c) A purely capacitive circuit
d) None of the above
28. In an AC parallel circuit, resonance occurs when:
a) The inductive reactance equals the capacitive reactance
b) Resistance equals inductance
c) Capacitance equals inductance
d) Resistance is maximum
29. In a parallel resonance circuit, the impedance is:
a) Minimum
b) Maximum
c) Infinite
d) Zero
30. At resonance in a series R-L-C circuit, the current is:
a) Maximum
b) Minimum
c) Zero
d) Independent of frequency
Active and Reactive Power
31. Active power is the power that is:
a) Transferred to the load
b) Lost in the system
c) Stored in the magnetic field
d) Reflected back
32. Active power is measured in:
a) Volt-amperes
b) Watts
c) Ohms
d) Coulombs
33. Reactive power is stored in:
a) Capacitors and inductors
b) Resistors
c) Transformers
d) Batteries
34. The unit of reactive power is:
a) Watt
b) Volt-ampere reactive (VAR)
c) Ohm
d) Ampere
35. The total power in an AC circuit is called:
a) Apparent power
b) Real power
c) Reactive power
d) Voltage power

General Questions
36. The power factor in a purely resistive circuit is:
a) 1
b) 0
c) Between 0 and 1
d) Negative
37. In a purely inductive AC circuit, the power factor is:
a) 1
b) 0
c) -1
d) Depends on the resistance
38. A power factor close to 1 indicates that the circuit is mostly:
a) Reactive
 b) Resistive
c) Inductive
d) None of the above
39. In an R-L circuit, the power factor is:
a) Leading
b) Lagging
c) Zero
d) Unity
40. The reactive power in a purely capacitive circuit is:
a) Zero
b) Negative
c) Positive
d) Depends on the frequency

Additional Questions
41. In an R-L-C series circuit, as the frequency increases, the impedance will:
a) Increase
b) Decrease
c) Remain the same
d) Depends on the values of L and C
42. The quality factor (Q) of a series resonant circuit is given by:
a) Q=LRQ = \frac{L}{R}Q=RL
b) Q=ωLRQ = \frac{\omega L}{R}Q=RωL
c) Q=1ωCRQ = \frac{1}{\omega C R}Q=ωCR1
d) Q=ωRLQ = \omega R LQ=ωRL
43. In an R-C series circuit, the phase angle between voltage and current is:
a) Zero
b) 45°
c) 90°
d) Depends on the frequency
44. Impedance in an AC circuit is measured in:
a) Ohms
b) Farads
c) Henrys
d) Volts
45. At resonance in a parallel R-L-C circuit, the current is:
a) Maximum
b) Minimum
c) Zero
d) Infinite
46. The unit of apparent power is:
a) Watts
b) VAR
c) Volt-amperes
d) Amperes
47. The voltage across the capacitor in an R-C series circuit lags the current by:
a) 90°
b) 180°
c) 0°
d) 45°
48. In a series R-L-C circuit, if the resistance increases, the resonant frequency will:
a) Increase
b) Decrease
c) Remain the same
d) Double
49. In an AC circuit, power factor correction is done using:
a) Capacitors
b) Resistors
c) Inductors
d) Transformers
50. Which component stores energy in an electric field?
a) Capacitor
b) Inductor
c) Resistor
d) Transformer