RC Circuits MCQ

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

• In a lag network, the output voltage lags the input voltage in phase.
  ক

  True

  খ

  False
• In a parallel RC circuit, there is 100 mA through the resistive branch and 100 mA through the capacitive branch. The total rms current is
  ক

  200 mA

  খ

  100 mA

  গ

  282 mA

  ঘ

  141 mA
• A 120 Ω resistor is in parallel with a capacitor with a capacitive reactance of 40 Ω. Both components are across a 12 V ac source. What is the magnitude of the total impedance?
  ক

  37.9 Ω

  খ

  3.7 Ω

  গ

  14,400 Ω

  ঘ

  4,800 Ω
• Point +4 on the complex plane is
  ক

  4 units above the origin on the j axis

  খ

  4 units below the origin on the j axis

  গ

  4 units right of the origin on the real axis

  ঘ

  4 units left of the origin on the real axis
• Positive numbers can be represented by points to the right of the origin on the horizontal axis of a graph.
  ক

  True

  খ

  False
• What is the value of the hypotenuse of a right triangle whose sides are 12 and 18?
  ক

  4.24

  খ

  3.46

  গ

  2.16

  ঘ

  21.63
• A filter passes all frequencies.
  ক

  True

  খ

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

  Increases

  খ

  Decreases

  গ

  Remains the same

  ঘ

  Becomes erratic
• The resistor voltage is always out of phase with the current.
  ক

  True

  খ

  False
• A complex number represents a phasor quantity.
  ক

  True

  খ

  False
• A 6 kHz sinusoidal voltage is applied to a series RC circuit. The frequency of the voltage across the resistor is
  ক

  0 Hz

  খ

  12 kHz

  গ

  6 kHz

  ঘ

  18 kHz
• A 470 Ω resistor and a 0.2 µF capacitor are in parallel across a 2.5 kHz ac source. The admittance, Y, in rectangular form, is
  ক

  212 Ω

  খ

  2.12 mS + j3.14 mS

  গ

  3.14 mS + j2.12 mS

  ঘ

  318.3 Ω
• A 47 Ω resistor and a capacitor with 150 Ω of capacitive reactance are in series across an ac source. The impedance, expressed in rectangular form, is
  ক

  Z = 47 Ω + j150 Ω

  খ

  Z = 47 Ω - j150 Ω

  গ

  Z = 197 Ω

  ঘ

  Z = 103 Ω
• The power factor (PF) indicates how much of the apparent power is true power.
  ক

  True

  খ

  False
• A resistor and a capacitor are in series across a 20 V ac source. Circuit impedance is 4.33 kΩ. Current flow in the circuit is
  ক

  9.2 mA

  খ

  92 mA

  গ

  4.6 mA

  ঘ

  460 mA
• An ac circuit consists of a resistor and a capacitor. To increase the phase angle above 45°, the following condition must exist:
  ক

  R = X_C

  খ

  R > X_C

  গ

  R C

  ঘ

  R = 5X_C
• In a series RC circuit, 12 V(rms) is measured across the resistor and 15 V(rms) is measured across the capacitor. The rms source voltage is
  ক

  3 V

  খ

  27 V

  গ

  19.2 V

  ঘ

  1.9 V
• Complex numbers can be added and subtracted but not multiplied or divided.
  ক

  True

  খ

  False
• The polar form of a complex number consists of a real part and a j part.
  ক

  True

  খ

  False
• In the complex plane, the number 14 - j5 is located in the
  ক

  First quadrant

  খ

  Second quadrant

  গ

  Third quadrant

  ঘ

  Fourth quadrant
• In the complex plane, the number 4 + j3 is located in the
  ক

  First quadrant

  খ

  Second quadrant

  গ

  Third quadrant

  ঘ

  Fourth quadrant
• A 47 Ω resistor and a capacitor with a capacitive reactance of 120 Ω are in series across an ac source. What is the circuit impedance, Z?
  ক

  129 Ω

  খ

  12.9 Ω

  গ

  167 Ω

  ঘ

  73 Ω
• For a certain load, the true power is 150 W and the reactive power is 125 VAR. The apparent power is
  ক

  19.52 W

  খ

  195.2 W

  গ

  275 W

  ঘ

  25 W
• An imaginary number is one that exists only in the mind of the mathematician.
  ক

  True

  খ

  False
• A 12 kΩ resistor is in series with a 0.02 µF capacitor across a 1.2 kHz ac source. If the current is expressed in polar form as I = 0.3 ∠0° mA, what is the source voltage expressed in polar form?
  ক

  45.6 V

  খ

  411.3 V

  গ

  0.411 V

  ঘ

  4.11 V
• A capacitor with 150 ohm of capacitive reactance is across an ac source. The impedance, expressed in polar form, is
  ক

  Z = 150 ohm

  খ

  Z = 150 ∠90° ohm

  গ

  Z = 150 ∠-90° ohm

  ঘ

  Z = 150 ∠180° ohm
• The circuit phase angle is the angle between the total current and the applied (source) voltage.
  ক

  True

  খ

  False
• When the frequency of the voltage applied to a series RC circuit is decreased, the impedance
  ক

  Increases

  খ

  Decreases

  গ

  Remains the same

  ঘ

  Doubles
• The impedance of a series RC circuit varies directly with frequency.
  ক

  True

  খ

  False
• What is the angular difference between +j4 and -j4?
  ক

  30°

  খ

  90°

  গ

  180°

  ঘ

  270°