AC Circuits

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Q. In an RLC circuit, if the resistance is 6Ω, inductive reactance is 8Ω, and capacitive reactance is 4Ω, what is the total impedance? (2021)
  • A. 10Ω
  • B. 12Ω
  • C. 14Ω
  • D. 16Ω
Q. In an RLC circuit, if the resistance is increased, what happens to the quality factor (Q)? (2021)
  • A. Increases
  • B. Decreases
  • C. Remains the same
  • D. Becomes zero
Q. In an RLC series circuit, if the inductive reactance is greater than the capacitive reactance, the circuit is said to be: (2022)
  • A. Resonant
  • B. Inductive
  • C. Capacitive
  • D. Purely resistive
Q. In an RLC series circuit, if the resistance is 10 Ω, inductance is 0.1 H, and capacitance is 100 μF, what is the resonant frequency? (2023)
  • A. 50 Hz
  • B. 100 Hz
  • C. 159 Hz
  • D. 200 Hz
Q. In an RLC series circuit, if the resistance is 10Ω, the inductance is 0.1H, and the capacitance is 100μF, what is the resonant frequency? (2020)
  • A. 50 Hz
  • B. 100 Hz
  • C. 159 Hz
  • D. 200 Hz
Q. In an RLC series circuit, if the total impedance is 20Ω and the resistance is 15Ω, what is the inductive reactance? (2022)
  • A.
  • B. 10Ω
  • C. 15Ω
  • D. 20Ω
Q. In an RLC series circuit, if the total impedance is 20Ω and the resistance is 15Ω, what is the reactance? (2022)
  • A.
  • B. 10Ω
  • C. 15Ω
  • D. 20Ω
Q. In an RLC series circuit, if the total impedance is 50 ohms and the resistance is 30 ohms, what is the reactance? (2020)
  • A. 40 ohms
  • B. 30 ohms
  • C. 20 ohms
  • D. 10 ohms
Q. The resonant frequency of an RLC circuit is given by which formula? (2022)
  • A. f = 1/(2π√(LC))
  • B. f = 2π√(LC)
  • C. f = LC
  • D. f = R/(2πL)
Q. What is the capacitive reactance of a capacitor of 10μF at a frequency of 60 Hz? (2016)
  • A. 265.26Ω
  • B. 159.15Ω
  • C. 100Ω
  • D. 50Ω
Q. What is the capacitive reactance of a capacitor with a capacitance of 10μF at a frequency of 50Hz? (2020)
  • A. 318.31 ohms
  • B. 159.15 ohms
  • C. 31.83 ohms
  • D. 15.92 ohms
Q. What is the effect of increasing the capacitance in a capacitive AC circuit on the current? (2022)
  • A. Increases current
  • B. Decreases current
  • C. No effect
  • D. Current becomes zero
Q. What is the effect of increasing the frequency on the capacitive reactance in an AC circuit? (2022)
  • A. Increases
  • B. Decreases
  • C. Remains the same
  • D. Becomes zero
Q. What is the effect of increasing the frequency on the impedance of a capacitor? (2023)
  • A. Increases
  • B. Decreases
  • C. Remains constant
  • D. Becomes infinite
Q. What is the effect of increasing the frequency on the inductive reactance in an AC circuit? (2022)
  • A. Increases
  • B. Decreases
  • C. Remains the same
  • D. Becomes zero
Q. What is the effect of increasing the frequency on the total impedance of an RLC circuit? (2020)
  • A. It always increases
  • B. It always decreases
  • C. It can increase or decrease
  • D. It remains constant
Q. What is the formula for calculating the total current in a parallel RLC circuit? (2023)
  • A. I = V/R
  • B. I = V/(1/R + 1/X)
  • C. I = V/(R + X)
  • D. I = V/R + V/X
Q. What is the formula for the average power consumed in an AC circuit with a phase angle φ? (2020)
  • A. P = VI
  • B. P = VI cos(φ)
  • C. P = VI sin(φ)
  • D. P = V²/R
Q. What is the formula for the average power consumed in an AC circuit with a resistor? (2019)
  • A. P = VI
  • B. P = V²/R
  • C. P = I²R
  • D. All of the above
Q. What is the formula for the resonant frequency of an RLC circuit? (2021)
  • A. f = 1/(2π√(LC))
  • B. f = R/(2πL)
  • C. f = 1/(2πRC)
  • D. f = 2π√(LC)
Q. What is the formula for the total impedance in a parallel RLC circuit? (2023)
  • A. 1/Z = 1/Z1 + 1/Z2 + 1/Z3
  • B. Z = R + jX
  • C. Z = R
  • D.
  • . X
  • . Z = R + jωL - j/(ωC)
Q. What is the impedance of a circuit with a resistance of 4 ohms and a reactance of 3 ohms? (2021)
  • A. 5 ohms
  • B. 7 ohms
  • C. 1 ohm
  • D. 12 ohms
Q. What is the impedance of a circuit with a resistance of 4Ω and a reactance of 3Ω? (2020)
  • A.
  • B.
  • C.
  • D. 12Ω
Q. What is the impedance of a circuit with a resistor of 10Ω and an inductor of 0.1 H at a frequency of 50 Hz? (2022)
  • A. 10Ω
  • B. 15.71Ω
  • C. 20Ω
  • D.
Q. What is the impedance of a circuit with a resistor of 10Ω and an inductor of 0.1H at a frequency of 50Hz? (2022)
  • A. 10Ω
  • B. 15.71Ω
  • C. 20Ω
  • D. 25Ω
Q. What is the impedance of a circuit with a resistor of 4Ω and a capacitor of 2μF at a frequency of 50Hz? (2020)
  • A.
  • B.
  • C.
  • D.
Q. What is the impedance of a circuit with a resistor of 4Ω and an inductor of 3Ω at resonance? (2022)
  • A.
  • B.
  • C.
  • D.
Q. What is the impedance of a series circuit containing a resistor (R) and an inductor (L) at angular frequency ω? (2020)
  • A. R
  • B. √(R² + (ωL)²)
  • C. R + jωL
  • D. R + L
Q. What is the impedance of a series circuit containing a resistor (R) and an inductor (L) at a frequency (f)? (2020)
  • A. R
  • B. √(R² + (2πfL)²)
  • C. R + 2πfL
  • D. R - 2πfL
Q. What is the phase angle in a circuit with a resistance of 30 ohms and a reactance of 40 ohms? (2021)
  • A. 53.13°
  • B. 36.87°
  • C. 45°
  • D. 60°
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