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Circuit Analysis –
Medium Difficulty
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#1. A parallel combination of a 4Ω resistor and an 8Ω resistor has an equivalent resistance of:
#2. The Q factor of a practical inductor is defined as:
#3. A sinusoidal current i(t) = 10sin(377t + 30°) A has a frequency of:
#4. In a purely resistive AC circuit, the phase angle between voltage and current is:
#5. A current divider with parallel resistors R1 and R2 has total current I. Current through R1 is:
#6. The instantaneous power in an AC circuit oscillates at:
#7. When using superposition, voltage sources are replaced with:
#8. A capacitor in DC steady state acts as:
#9. The RMS value of a sinusoidal voltage with peak amplitude Vm is:
#10. For maximum power transfer from source to load, the load resistance should equal:
#11. For a 3-phase delta load, line voltage equals:
#12. In a balanced three-phase system, the sum of the three line voltages is:
#13. The power factor of a circuit with impedance Z = 3 + j4 Ω is:
#14. The average power in a circuit with V=100V RMS, I=5A RMS, and pf=0.8 lagging is:
#15. A voltage source of 24V is connected across a series combination of 4Ω and 8Ω resistors. What is the voltage across the 8Ω resistor?
#16. The source transformation converts a voltage source Vs in series with R to:
#17. The impedance of a 10mH inductor at 1 kHz is:
#18. The time constant of an RC circuit is:
#19. What is the equivalent capacitance of two 10µF capacitors in series?
#20. The impedance of a 10µF capacitor at 1 kHz is:
#21. If two impedances Z1 = 3 + j4 Ω and Z2 = 6 – j8 Ω are in series, the total impedance is:
#22. The superposition theorem can be applied to circuits with:
#23. The Norton equivalent of a circuit consists of:
#24. A practical inductor can be modeled as:
#25. The average value of a full-wave rectified sinusoidal voltage with peak Vm is:
#26. The admittance Y = G + jB, where G is conductance and B is:
#27. The complex conjugate of 3 + j4 is:
#28. In mesh analysis, we write equations based on:
#29. A current source of 2A is connected in parallel with a 10Ω resistor. The voltage across the resistor is:
#30. The unit of reactive power Q is:
#31. When using superposition, current sources are replaced with:
#32. A 60Hz sinusoidal voltage has a period of:
#33. In a series circuit with three resistors R1=10Ω, R2=20Ω, and R3=30Ω connected to a 12V source, what is the total current?
#34. What is the equivalent inductance of two 5mH inductors in series (no mutual coupling)?
#35. The energy stored in a capacitor with capacitance C and voltage V is:
#36. The crest factor (peak/RMS) of a sinusoidal waveform is:
#37. In a wye (Y) connected load with line voltage VL, each phase voltage is:
#38. What is the equivalent inductance of two 10mH inductors in parallel (no mutual coupling)?
#39. What is the power dissipated by a 100Ω resistor with 0.5A flowing through it?
#40. The resonant frequency of a series LC circuit with L = 10mH and C = 10µF is:
#41. A circuit has 3 independent loops. The number of independent KVL equations is:
#42. The voltage across a 5Ω resistor carrying 3A DC current is:
#43. In a delta (Δ) connected load, each impedance experiences:
#44. Convert 3 – j4 to polar form:
#45. In a parallel RLC circuit, at resonance the impedance is:
#46. A circuit has 4 nodes. The maximum number of independent KCL equations is:
#47. A sinusoidal voltage v(t) = 100cos(ωt + 30°) V is equivalent to:
#48. For a balanced three-phase system, the line current in a Y-connected load equals:
#49. In an ideal transformer with turns ratio N1:N2, the current ratio I1:I2 equals:
#50. In an ideal transformer with turns ratio N1:N2, the voltage ratio V1:V2 equals:
#51. A circuit has a power factor of 0.707 lagging. The phase angle is:
#52. In a purely reactive circuit, the power factor is:
#53. What is the equivalent capacitance of two 10µF capacitors in parallel?
#54. The phase sequence in a three-phase system describes:
#55. An inductor in DC steady state acts as:
#56. A 120V RMS source at 60 Hz is connected to a 40Ω resistor. The average power dissipated is:
#57. Two resistors of 6Ω and 3Ω are connected in parallel. What is the equivalent resistance?
#58. The line-to-line voltage in a balanced 3-phase Y-connected source with 120V phase voltage is:
#59. In a purely capacitive AC circuit, current:
#60. The reciprocal of impedance Z is called:
#61. Convert 5∠53.13° to rectangular form:
#62. The time constant of an RL circuit is:
#63. The complex power S in AC circuits is defined as:
#64. The wavelength of a 100 MHz electromagnetic wave in free space is:
#65. The bandwidth of a series RLC circuit is:
#66. The reactive power in a circuit with V=100V RMS, I=5A RMS, and pf=0.8 lagging is:
#67. The quality factor Q of a series RLC circuit is:
#68. In a series RLC circuit, at resonance the impedance is:
#69. For the circuit with Z = 8 + j6 Ω, the magnitude of impedance is:
#70. The relationship between Thevenin and Norton equivalents is:
#71. In phasor notation, a voltage v(t) = 170sin(ωt + 45°) V is represented as:
#72. In a purely inductive AC circuit, current:
#73. The total power in a balanced 3-phase system is:
#74. A dependent source is one whose value depends on:
#75. For a balanced three-phase delta-connected load, the line current equals:
#76. In a voltage divider with R1 on top and R2 on bottom, the output voltage (across R2) is:
#77. In a purely resistive circuit, the power factor is:
#78. The frequency response of a circuit is the plot of:
#79. The apparent power in a circuit with V=100V RMS and I=5A RMS is:
#80. In an RC circuit, after 5 time constants, the capacitor is approximately:
#81. The unit of apparent power S is:
#82. Three resistors of 3Ω, 6Ω, and 9Ω in series have a total resistance of:
#83. The energy stored in an inductor with inductance L and current I is:
#84. The Thevenin equivalent of a circuit consists of:
#85. A 10:1 step-down transformer has primary voltage of 120V. The secondary voltage is:
#86. According to Kirchhoff’s Current Law (KCL), the algebraic sum of currents at any node equals:
#87. The form factor of a sinusoidal waveform (RMS/Average of rectified) is approximately:
#88. In node analysis, we write equations based on:
#89. To improve power factor from lagging to unity, we should add:
#90. In a circuit with V = 100∠0° V and I = 5∠-30° A, the power factor is:
#91. In a series RL circuit, the time constant τ is equal to:
#92. The power consumed by a pure capacitor in AC circuit is:
#93. For maximum power transfer, the load resistance should be:
#94. The total capacitance of two capacitors C1 and C2 in series is:
#95. In a balanced three-phase system, line voltage is related to phase voltage by:
#96. The bandwidth of a series RLC circuit is given by:
#97. A 10Ω and 15Ω resistor in parallel gives an equivalent resistance of:
#98. The RMS value of a sinusoidal voltage with peak value Vm is:
#99. A voltage source with internal resistance Rs delivers maximum power when RL equals:
#100. The phase difference between voltage and current in a pure inductor is:
