Alternating Current
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Questions and Answers

What is the main reason a choke coil is not used in dc circuits?

  • Because the resistance of the coil is very high
  • Because XL is infinite
  • Because XL is zero (correct)
  • Because the inductance is very small

    • What is the condition for resonance in a series RLC circuit?

  • When XL = XC (correct)
  • When XC = R
  • When XL = XC = R
  • When XL = R

    • A series RLC circuit has a resistance of 300 Ω, an inductance of 0.9 H, and a capacitance of 2.0 μF. What is the impedance of the circuit if the angular frequency is 1000 rad/s?

  • 500 Ω (correct)
  • 400 Ω
  • 900 Ω
  • 1300 Ω

    • In a series RLC circuit, what is the relationship between the voltage across the resistor, inductor, and capacitor?

    <p>VL + VC + VR = 0</p> Signup and view all the answers

    What is the relationship between the elements in an RC circuit?

    <p>tanφ = XC</p> Signup and view all the answers

    In a series RLC circuit, what is the condition for resonance?

    <p>XL = XC</p> Signup and view all the answers

    What is the phase angle φ in an RC circuit?

    <p>π/4</p> Signup and view all the answers

    What is the impedance of a circuit with R = 1kΩ, L = 10H, and C = 10μF?

    <p>R + (XL - XC)</p> Signup and view all the answers

    What is the equation of voltage in a series RLC circuit?

    <p>V = VR^2 + (VL - VC)^2</p> Signup and view all the answers

    What is the phase angle between the voltage and current in a purely resistive circuit?

    <p>0o</p> Signup and view all the answers

    What is the formula for the impedance of an RLC circuit?

    <p>Z = sqrt(R^2 + XC^2)</p> Signup and view all the answers

    What is the condition for resonance to occur in an LC circuit?

    <p>XL = XC</p> Signup and view all the answers

    What is the phase angle between the voltage and current in a purely inductive circuit?

    <p>90o</p> Signup and view all the answers

    What is the formula for the RMS value of an AC voltage source?

    <p>Vrms = V0 / sqrt(2)</p> Signup and view all the answers

    What is the reciprocal of resistance?

    <p>Conductance</p> Signup and view all the answers

    Why can't dc meters be used to measure ac?

    <p>Because the average value of ac current is zero</p> Signup and view all the answers

    What is the unit of impedance?

    <p>Ohm</p> Signup and view all the answers

    What type of reactance is offered by a capacitor?

    <p>Capacitive reactance</p> Signup and view all the answers

    What is the relationship between XL and XC in an LC circuit?

    <p>XL = XC</p> Signup and view all the answers

    In the given circuit, what is the value of the total impedance if the frequency of the AC source is 50 Hz?

    <p>8.66 Ω</p> Signup and view all the answers

    What is the reading of the ammeter in the given circuit if the AC source has a voltage of 20 cos(2000t) and the circuit has a resistance of 4 Ω, an inductance of 5 mH, and a capacitance of 50 μF?

    <p>0.47 A</p> Signup and view all the answers

    In the given circuit, what is the value of the inductance if the current is maximum at a frequency of 50 Hz and the capacitance is 10 μF?

    <p>50 π Henry</p> Signup and view all the answers

    What is the relationship between the voltage across the inductor and the capacitor in the given circuit when it is at resonance?

    <p>VL = VC</p> Signup and view all the answers

    What is the value of the self-inductance of a choke coil if it is given as 10 mH?

    <p>0.01 H</p> Signup and view all the answers

    What is the relationship between the r.m.s value of an AC voltage and the peak value?

    <p>The r.m.s value is the peak value divided by the square root of 2</p> Signup and view all the answers

    What is the average value of an alternating current over one complete cycle?

    <p>It is zero</p> Signup and view all the answers

    What is the formula for the r.m.s value of a complex AC current wave?

    <p>$i_{rms} = \$a^2 + b^2\$</p> Signup and view all the answers

    What is the average value of an AC voltage over half a cycle?

    <p>It is 63.7% of the peak value</p> Signup and view all the answers

    What is the relationship between the r.m.s value of an AC voltage and the value of a DC voltage that produces the same heating effect?

    <p>The r.m.s value is equal to the DC voltage</p> Signup and view all the answers

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