Circuit Theory

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Q. What does the term 'phasor' represent in AC analysis?
  • A. A time-domain signal
  • B. A complex number representing magnitude and phase
  • C. A type of resistor
  • D. A frequency component
Q. What is Ohm's Law?
  • A. V = I * R
  • B. P = V * I
  • C. I = V / R
  • D. R = V / I
Q. What is the effect of increasing frequency on the reactance of a capacitor?
  • A. Reactance increases
  • B. Reactance decreases
  • C. Reactance remains constant
  • D. Reactance becomes zero
Q. What is the equivalent capacitance of two capacitors in series, C1 = 6μF and C2 = 3μF?
  • A. 2μF
  • B. 4μF
  • C. 1μF
  • D. 9μF
Q. What is the equivalent impedance (Z) of a 4Ω resistor in series with a 3Ω resistor?
  • A.
  • B.
  • C.
  • D.
Q. What is the equivalent impedance (Z) of a circuit with a 3Ω resistor and a 4Ω inductor in series at a frequency where the inductive reactance is 4Ω?
  • A.
  • B.
  • C.
  • D. 12Ω
Q. What is the equivalent impedance of a resistor (R) in series with an inductor (L) at a frequency (f)?
  • A. Z = R + jωL
  • B. Z = R - jωL
  • C. Z = R + jL
  • D. Z = R - jL
Q. What is the equivalent Norton current for a circuit with a 12V source and a 4Ω resistor?
  • A. 3 A
  • B. 4 A
  • C. 6 A
  • D. 12 A
Q. What is the equivalent resistance of a 5 ohm and a 10 ohm resistor in series?
  • A. 15 ohms
  • B. 5 ohms
  • C. 10 ohms
  • D. 50 ohms
Q. What is the equivalent resistance of two resistors in parallel, R1 = 4 ohms and R2 = 6 ohms?
  • A. 2.4 ohms
  • B. 10 ohms
  • C. 24 ohms
  • D. 1.5 ohms
Q. What is the equivalent resistance of two resistors in parallel, R1 = 6Ω and R2 = 3Ω?
  • A.
  • B.
  • C.
  • D. 1.5Ω
Q. What is the equivalent resistance of two resistors, 3Ω and 6Ω, in parallel?
  • A.
  • B.
  • C. 1.5Ω
  • D.
Q. What is the equivalent resistance of two resistors, 4 ohms and 6 ohms, in series?
  • A. 10 ohms
  • B. 24 ohms
  • C. 2.4 ohms
  • D. 0.67 ohms
Q. What is the equivalent resistance of two resistors, 4Ω and 6Ω, in series?
  • A. 10Ω
  • B. 24Ω
  • C. 2.4Ω
  • D. 0.67Ω
Q. What is the equivalent resistance of two resistors, R1 = 6Ω and R2 = 3Ω, in parallel?
  • A.
  • B.
  • C.
  • D. 18Ω
Q. What is the equivalent voltage source in Thevenin's theorem?
  • A. The open-circuit voltage
  • B. The short-circuit current
  • C. The total current
  • D. The total resistance
Q. What is the formula for calculating power in a DC circuit?
  • A. P = V / I
  • B. P = I^2 * R
  • C. P = V * I
  • D. P = R / V
Q. What is the formula for calculating power in an AC circuit with a phase angle?
  • A. P = V * I
  • B. P = V * I * cos(θ)
  • C. P = I^2 * R
  • D. P = V^2 / R
Q. What is the formula for calculating power in an AC circuit?
  • A. P = V^2 / R
  • B. P = I^2 * R
  • C. P = V * I * cos(φ)
  • D. P = V / I
Q. What is the formula for calculating power in an electrical circuit?
  • A. P = V / I
  • B. P = I * R
  • C. P = V * I
  • D. P = R / V
Q. What is the formula for calculating the total power in a resistive AC circuit?
  • A. P = V^2 / R
  • B. P = I^2 * R
  • C. P = V * I * cos(φ)
  • D. P = R * I^2
Q. What is the formula for calculating the total power in a three-phase AC system?
  • A. P = √3 * V * I * cos(φ)
  • B. P = V * I
  • C. P = V^2 / R
  • D. P = I^2 * R
Q. What is the formula for calculating total impedance in a series AC circuit?
  • A. Z = R + jX
  • B. Z = R - jX
  • C. Z = R * X
  • D. Z = R / X
Q. What is the formula for calculating total impedance in a series RLC circuit?
  • A. Z = R + jX
  • B. Z = R + j(X_L - X_C)
  • C. Z = R + X_L + X_C
  • D. Z = R + j(X_C - X_L)
Q. What is the impedance (Z) of a circuit with a 4Ω resistor and a 3Ω inductor at a frequency where the inductive reactance (XL) is 3Ω?
  • A.
  • B.
  • C.
  • D.
Q. What is the impedance of a capacitor at a frequency of 60 Hz with a capacitance of 10 µF?
  • A. 2652.58 ohms
  • B. 26.52 ohms
  • C. 0.265 ohms
  • D. 0.0265 ohms
Q. What is the impedance of a capacitor at a frequency of 60Hz with a capacitance of 10μF?
  • A. 2652Ω
  • B. 0.2652Ω
  • C. 0.02652Ω
  • D. 15.9Ω
Q. What is the impedance of a capacitor in an AC circuit at frequency f?
  • A. Z_C = 1 / (jωC)
  • B. Z_C = jωC
  • C. Z_C = R + jX_C
  • D. Z_C = R - jX_C
Q. What is the impedance of a circuit with a 10Ω resistor and a 5Ω inductor at a frequency of 60Hz (assuming inductive reactance of 3Ω)?
  • A.
  • B.
  • C. 10Ω
  • D. 13Ω
Q. What is the impedance of a circuit with a 10Ω resistor and a 5Ω inductor at a frequency of 60Hz?
  • A. 10Ω
  • B. 15Ω
  • C.
  • D. 12.25Ω
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