RL Circuits MCQ

Test your knowledge with important RL Circuits MCQ and their applications. These MCQs are beneficial for competitive exams too. Explore 30 + more RL Circuits MCQs at Bissoy

• A power factor of 1 indicates a purely reactive circuit, and a power factor of 0 indicates a purely resistive circuit.
  ক

  True

  খ

  False
• In a parallel RL circuit, there are 3 A rms in the resistive branch and 3 A rms in the inductive branch. The total rms current is
  ক

  6 A

  খ

  424 mA

  গ

  4.24 A

  ঘ

  42.4 A
• A 470 Ω resistor and a 200 mH coil are in parallel. Both components are across a 1.5 kHz ac source. The total admittance of the circuit, in polar form, is
  ক

  12.60 ∠-76° mS

  খ

  12.18 ∠76° mS

  গ

  218 ∠-76° mS

  ঘ

  12.18 ∠-76° mS
• Which of the following power factors results in less energy loss in an RL circuit?
  ক

  1

  খ

  0.8

  গ

  0.4

  ঘ

  0.2
• The impedance of an RL circuit varies inversely with frequency.
  ক

  True

  খ

  False
• When the frequency of the voltage applied to a series RL circuit is increased, the phase angle
  ক

  Decreases

  খ

  Increases

  গ

  Does not change

  ঘ

  Cannot be determined without values
• The resistor voltage in an RL circuit is always out of phase with the current.
  ক

  True

  খ

  False
• When the frequency is decreased, the impedance of a parallel RL circuit Increases
  ক

  True

  খ

  False
• To increase the current in a series RL circuit, the frequency
  ক

  Should be increased

  খ

  Should be decreased

  গ

  Should be constant

  ঘ

  Cannot be determined without values
• The power factor indicates how much of the apparent power is reactive power.
  ক

  True

  খ

  False
• A 470 Ω resistor and a coil with 125 Ω inductive reactance are in parallel. Both components are across a 15 V ac voltage source. Current through the inductor is
  ক

  152 mA

  খ

  32 mA

  গ

  12 mA

  ঘ

  120 mA
• A 3.3 kΩ resistor and a 120 mH coil are in parallel. Both components are across a 2 kHz, 12 V ac source. The total current in the circuit is
  ক

  8.74 mA

  খ

  874 mA

  গ

  874 µA

  ঘ

  8.74 µA
• In an RL circuit, part of the power is resistive and part is reactive.
  ক

  True

  খ

  False
• In a series RL circuit, 12 V rms is measured across the resistor and 14 V rms is measured across the inductor. The peak value of the source voltage is
  ক

  18.4 V

  খ

  26.0 V

  গ

  2 V

  ঘ

  20 V
• If a load is purely inductive and the reactive power is 12 VAR, the apparent power is
  ক

  0 VA

  খ

  12 VA

  গ

  6 VA

  ঘ

  24 VA
• A 47 Ω resistor is in series with an inductive reactance of 120 Ω across an ac source. The impedance, expressed in polar form, is
  ক

  47 ∠68.6° Ω

  খ

  120 ∠68.6° Ω

  গ

  129 ∠31.4° Ω

  ঘ

  129 ∠68.6° Ω
• A 12 kΩ resistor is in series with a 90 mH coil across an 8 kHz ac source. Current flow in the circuit, expressed in polar form, is I = 0.3 ∠0° mA. The source voltage, expressed in polar form, is
  ক

  3.84 ∠20.6° V

  খ

  12.8 ∠20.6° V

  গ

  0.3 ∠20.6° V

  ঘ

  13.84 ∠69.4° V
• When the frequency of the voltage applied to a series RL circuit is decreased, the impedance
  ক

  Decreases

  খ

  Increases

  গ

  Does not change

  ঘ

  Cannot be determined without values
• A 1.2 kΩ resistor is in series with a 15 mH coil across a 10 kHz ac source. The magnitude of the total impedance is
  ক

  152.6 Ω

  খ

  1,526 Ω

  গ

  1,200 Ω

  ঘ

  942 Ω
• A 140 Ω resistor is in parallel with an inductor having 60 Ω inductive reactance. Both components are across a 12 V ac source. The magnitude of the total impedance is
  ক

  5.51 Ω

  খ

  55.15 Ω

  গ

  90 Ω

  ঘ

  200 Ω
• The phase angle (θ) of a series RL circuit varies directly with frequency.
  ক

  True

  খ

  False
• When the resistor voltage in a series RL circuit becomes less than the inductor voltage, the phase angle
  ক

  Increases

  খ

  Decreases

  গ

  Is not affected

  ঘ

  Cannot be determined
• Total current in an RL circuit always lags the source voltage.
  ক

  True

  খ

  False
• A 1.5 kΩ resistor and a coil with a 2.2 kΩ inductive reactance are in series across an 18 V ac source. The power factor is
  ক

  564

  খ

  0.564

  গ

  6.76

  ঘ

  55.7
• In an RL circuit, the impedance is determined by both the resistance and the inductive reactance combined.
  ক

  True

  খ

  False
• When the frequency is decreased, the impedance of a parallel RL circuit
  ক

  Increases

  খ

  Decreases

  গ

  Remains constant

  ঘ

  Is not a factor
• When the frequency of the voltage applied to a series RL circuit is decreased, the impedance decreases
  ক

  True

  খ

  False
• A filter passes certain frequencies and rejects others.
  ক

  True

  খ

  False
• If the frequency is halved and the resistance is doubled, the impedance of a series RL circuit
  ক

  Doubles

  খ

  Halves

  গ

  Remains constant

  ঘ

  Cannot be determined without values