Circuit Theory

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Q. In a series AC circuit, how does the total impedance (Z) relate to resistance (R) and reactance (X)?
  • A. Z = R + X
  • B. Z = R - X
  • C. Z = √(R^2 + X^2)
  • D. Z = R * X
Q. In a series AC circuit, if the voltage is 120V and the current is 10A, what is the power consumed?
  • A. 120W
  • B. 100W
  • C. 1000W
  • D. 1200W
Q. In a series circuit with a 12V battery and two resistors of 4Ω and 6Ω, what is the current flowing through the circuit?
  • A. 0.8 A
  • B. 1.2 A
  • C. 2 A
  • D. 3 A
Q. In a series circuit with a 24V source and two resistors of 4Ω and 8Ω, what is the voltage across the 8Ω resistor?
  • A. 16V
  • B. 8V
  • C. 12V
  • D. 4V
Q. In a series circuit with a 9V battery and two resistors (3Ω and 6Ω), what is the current flowing through the circuit?
  • A. 1A
  • B. 2A
  • C. 3A
  • D. 4A
Q. In a series circuit with a 9V battery and two resistors (3Ω and 6Ω), what is the voltage across the 6Ω resistor?
  • A. 6V
  • B. 3V
  • C. 9V
  • D. 4.5V
Q. In a series circuit, how does the total current relate to the individual branch currents according to KCL?
  • A. Total current is the sum of branch currents
  • B. Total current is the average of branch currents
  • C. Total current is the maximum branch current
  • D. Total current is the minimum branch current
Q. In a series circuit, if one resistor fails open, what happens to the current?
  • A. It increases
  • B. It decreases
  • C. It becomes zero
  • D. It remains the same
Q. In a series circuit, if the total voltage is 12V and the resistance is 4Ω, what is the current flowing through the circuit?
  • A. 3A
  • B. 4A
  • C. 12A
  • D. 0.33A
Q. In a series circuit, if the total voltage is 12V and the resistances are 2Ω and 4Ω, what is the current flowing through the circuit?
  • A. 2A
  • B. 3A
  • C. 4A
  • D. 6A
Q. In a series circuit, if the total voltage is 12V and the resistances are 2Ω, 3Ω, and 5Ω, what is the current flowing through the circuit?
  • A. 1A
  • B. 2A
  • C. 3A
  • D. 4A
Q. In a series RLC circuit, if the resistance is 10Ω, the inductance is 0.1H, and the capacitance is 100μF, what is the resonant frequency?
  • A. 159.15Hz
  • B. 100Hz
  • C. 50Hz
  • D. 200Hz
Q. In an AC circuit, if the impedance is 5Ω and the current is 2A, what is the voltage across the circuit?
  • A. 10V
  • B. 5V
  • C. 2.5V
  • D. 1V
Q. In an AC circuit, if the voltage is given as V(t) = 100√2 sin(ωt), what is the RMS voltage?
  • A. 100 V
  • B. 70.71 V
  • C. 141.42 V
  • D. 50 V
Q. In an AC circuit, if the voltage is given as V(t) = 10sin(100t), what is the peak voltage?
  • A. 10V
  • B. 5V
  • C. 7.07V
  • D. 0V
Q. In an AC circuit, what does impedance represent?
  • A. The total opposition to current flow
  • B. The total voltage in the circuit
  • C. The total power consumed
  • D. The total current flowing
Q. In an AC circuit, what does the impedance (Z) represent?
  • A. Total opposition to current flow
  • B. Only resistance
  • C. Only reactance
  • D. Voltage drop
Q. In an AC circuit, what does the term 'impedance' refer to?
  • A. Resistance only
  • B. Total opposition to current
  • C. Voltage drop
  • D. Current flow
Q. In an AC circuit, what is the impedance of a circuit with a resistor of 4Ω and an inductor with a reactance of 3Ω?
  • A.
  • B.
  • C.
  • D. 12Ω
Q. In an AC circuit, what is the impedance of a circuit with a resistor of 5Ω and an inductor with a reactance of 3Ω?
  • A.
  • B.
  • C.
  • D. 15Ω
Q. In an AC circuit, what is the phase difference between voltage and current in a purely resistive circuit?
  • A. 0 degrees
  • B. 90 degrees
  • C. 180 degrees
  • D. 270 degrees
Q. In an AC circuit, what is the phase difference between voltage and current in a purely resistive load?
  • A. 0 degrees
  • B. 90 degrees
  • C. 180 degrees
  • D. 270 degrees
Q. In an AC circuit, what is the power factor?
  • A. Ratio of real power to apparent power
  • B. Ratio of reactive power to real power
  • C. Total power consumed
  • D. Voltage divided by current
Q. Using KCL, if three currents enter a node: 5A, 3A, and 2A, what is the current leaving the node?
  • A. 0A
  • B. 2A
  • C. 3A
  • D. 10A
Q. Using KCL, if three currents entering a node are 2A, 3A, and 1A, what is the current leaving the node?
  • A. 6A
  • B. 4A
  • C. 3A
  • D. 2A
Q. Using KCL, if three currents entering a node are 5A, 3A, and 2A, what is the total current leaving the node?
  • A. 10A
  • B. 8A
  • C. 6A
  • D. 4A
Q. What does KCL state about currents at a junction?
  • A. The sum of currents entering equals the sum of currents leaving
  • B. The sum of voltages equals zero
  • C. Current is constant in a closed loop
  • D. Power is conserved in a circuit
Q. What does Kirchhoff's Voltage Law (KVL) state?
  • A. The sum of currents in a closed loop is zero
  • B. The sum of voltages in a closed loop is zero
  • C. The total power in a circuit is constant
  • D. The total resistance in a circuit is constant
Q. What does KVL (Kirchhoff's Voltage Law) state?
  • A. The sum of currents in a loop is zero
  • B. The sum of voltages in a closed loop is zero
  • C. The voltage across a resistor is constant
  • D. The total power in a circuit is zero
Q. What does KVL state about the voltages in a closed loop?
  • A. The sum of voltages is zero
  • B. The sum of currents is zero
  • C. The sum of resistances is zero
  • D. The sum of powers is zero
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