Alternating Current

Q. A capacitor in an AC circuit has a capacitive reactance of 50 ohms. If the frequency of the AC source is increased, what happens to the capacitive reactance?
  • A. Increases
  • B. Decreases
  • C. Remains the same
  • D. Becomes infinite
Q. A capacitor in an AC circuit has a capacitive reactance of 50 ohms. What is the frequency if the capacitance is 10 microfarads?
  • A. 1 kHz
  • B. 10 kHz
  • C. 100 Hz
  • D. 1000 Hz
Q. If the frequency of an AC source is 60 Hz, what is the time period of the AC signal?
  • A. 0.0167 s
  • B. 0.0333 s
  • C. 0.05 s
  • D. 0.1 s
Q. If the frequency of an AC source is increased, what happens to the capacitive reactance?
  • A. It increases
  • B. It decreases
  • C. It remains the same
  • D. It becomes infinite
Q. If the inductance of a coil is 2 H and the frequency is 50 Hz, what is the inductive reactance?
  • A. 100 π
  • B. 100
  • C. 314
  • D. 628
Q. If the peak current in an AC circuit is 5 A, what is the average current over one complete cycle?
  • A. 5 A
  • B. 2.5 A
  • C. 0 A
  • D. 7.07 A
Q. If the peak voltage of an AC source is 200 V, what is the RMS voltage?
  • A. 100 V
  • B. 141.42 V
  • C. 200 V
  • D. 282.84 V
Q. If the peak voltage of an AC source is 220 V, what is the RMS voltage?
  • A. 110 V
  • B. 154 V
  • C. 220 V
  • D. 311 V
Q. In a parallel RLC circuit, what happens to the total current if the frequency is increased?
  • A. Increases
  • B. Decreases
  • C. Remains the same
  • D. Depends on R
Q. In a series RLC circuit, at resonance, what is the relationship between inductive reactance and capacitive reactance?
  • A. X_L > X_C
  • B. X_L < X_C
  • C. X_L = X_C
  • D. X_L + X_C = 0
Q. In a series RLC circuit, if the resistance is increased, what happens to the bandwidth of the resonance?
  • A. Increases
  • B. Decreases
  • C. Remains the same
  • D. Becomes zero
Q. In a series RLC circuit, if the resistance is increased, what happens to the bandwidth?
  • A. Increases
  • B. Decreases
  • C. Remains the same
  • D. Becomes zero
Q. In a series RLC circuit, if the resistance is increased, what happens to the bandwidth of the resonance peak?
  • A. Increases
  • B. Decreases
  • C. Remains the same
  • D. Becomes zero
Q. In a series RLC circuit, what happens to the current at resonance?
  • A. Maximum
  • B. Minimum
  • C. Zero
  • D. Constant
Q. In a series RLC circuit, what happens to the current when the frequency is increased beyond the resonant frequency?
  • A. Increases
  • B. Decreases
  • C. Remains constant
  • D. Becomes zero
Q. In a series RLC circuit, what is the condition for resonance?
  • A. R = 0
  • B. L = C
  • C. ωL = 1/ωC
  • D. V = I
Q. In an AC circuit, if the current lags the voltage by 30 degrees, what is the type of load?
  • A. Resistive
  • B. Inductive
  • C. Capacitive
  • D. None of the above
Q. In an AC circuit, if the current lags the voltage by 30 degrees, what type of circuit is it?
  • A. Resistive
  • B. Inductive
  • C. Capacitive
  • D. None of the above
Q. In an AC circuit, if the current lags the voltage by 30 degrees, what type of load is present?
  • A. Resistive
  • B. Inductive
  • C. Capacitive
  • D. None of the above
Q. In an AC circuit, if the current lags the voltage by 45 degrees, what is the type of load?
  • A. Resistive
  • B. Inductive
  • C. Capacitive
  • D. None of the above
Q. In an AC circuit, if the frequency is doubled, what happens to the inductive reactance?
  • A. It doubles
  • B. It halves
  • C. It remains the same
  • D. It quadruples
Q. In an AC circuit, if the frequency is doubled, what happens to the reactance of an inductor?
  • A. Doubles
  • B. Halves
  • C. Remains the same
  • D. Quadruples
Q. In an AC circuit, if the power factor is 0.5, what is the angle between voltage and current?
  • A. 30 degrees
  • B. 60 degrees
  • C. 90 degrees
  • D. 45 degrees
Q. In an AC circuit, if the power factor is 1, what type of load is present?
  • A. Inductive
  • B. Capacitive
  • C. Resistive
  • D. Reactive
Q. In an AC circuit, if the voltage is given by V(t) = V_0 sin(ωt), what is the expression for the current through a resistor R?
  • A. I(t) = (V_0/R) sin(ωt)
  • B. I(t) = (V_0/R) cos(ωt)
  • C. I(t) = (R/V_0) sin(ωt)
  • D. I(t) = (R/V_0) cos(ωt)
Q. In an RLC circuit, what is the condition for resonance?
  • A. XL = XC
  • B. R = 0
  • C. L = C
  • D. f = 0
Q. In an RLC series circuit, if the resistance is increased while keeping the inductance and capacitance constant, what happens to the quality factor (Q)?
  • A. Increases
  • B. Decreases
  • C. Remains the same
  • D. Becomes zero
Q. In an RLC series circuit, what is the condition for resonance?
  • A. XL = XC
  • B. R = 0
  • C. XL > XC
  • D. R > XL
Q. What is the average power consumed in an AC circuit with a power factor of 0.8 and a maximum power of 100 W?
  • A. 80 W
  • B. 100 W
  • C. 120 W
  • D. 160 W
Q. What is the average power consumed in an AC circuit with a power factor of 0.8 and an RMS voltage of 100 V with a current of 5 A?
  • A. 200 W
  • B. 400 W
  • C. 300 W
  • D. 500 W
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