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MHT-CET AC Circuits — practice questions — page 2

Explore 58 free AC Circuits questions in MHT-CET Physics. Open each question or exercise to read its content, reference answers and available explanation.

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AC Circuits questions and exercises with answers

Showing questions 31–58 of 58.

Which principle lets a radio receiver select one station out of many?Read the answer and worked solution →In a radio tuner, which component is varied to pick a desired station?Read the answer and worked solution →What is the nature of the Q factor of a resonant circuit?Read the answer and worked solution →A series resonant circuit with a larger Q factor has what kind of current peak?Read the answer and worked solution →A series circuit has ωr = 1000 rad/s, L = 0.1 H and R = 5 Ω. What is its Q factor?Read the answer and worked solution →How is the Q factor of a series resonant circuit defined?Read the answer and worked solution →What is the purpose of a choke coil in an AC circuit?Read the answer and worked solution →A choke coil is wound on which kind of core?Read the answer and worked solution →What does laminating the iron core of a choke coil reduce?Read the answer and worked solution →A choke coil has a very large L and a very small R. Its power factor is nearly what?Read the answer and worked solution →Why is a choke coil preferred to a resistor for lowering AC in a lamp circuit?Read the answer and worked solution →In an AC circuit, what is cos φ called?Read the answer and worked solution →What is the average power consumed by an ideal inductor over a full cycle?Read the answer and worked solution →What is the current in a pure inductor or ideal capacitor commonly called?Read the answer and worked solution →A 100 V rms source drives a series circuit with R = 3 Ω and impedance 5 Ω. What power is dissipated?Read the answer and worked solution →A series circuit has resistance 3 Ω and impedance 5 Ω. What is its power factor?Read the answer and worked solution →How much power does an ideal capacitor use over a complete AC cycle?Read the answer and worked solution →In LC oscillations, energy shuttles between which two forms?Read the answer and worked solution →In an AC generator, the emf direction reverses after how much rotation of the coil?Read the answer and worked solution →A current is given by i = 5 sin(200πt) amperes. What is its frequency?Read the answer and worked solution →Which kind of supply has a voltage whose polarity keeps changing periodically?Read the answer and worked solution →Which home appliance runs directly on AC without first converting it to DC?Read the answer and worked solution →How does an ideal resistor respond to AC compared with DC?Read the answer and worked solution →Which AC does a pure inductor oppose most strongly?Read the answer and worked solution →For e = 6 sin(100πt) volts, what is the instantaneous voltage at t = 2 ms?Read the answer and worked solution →A 0.2 H inductor is joined to a 50 Hz source of peak emf 210 V. What is the peak current?Read the answer and worked solution →In a pure inductive circuit, what is the source voltage at the instant the current is at its peak?Read the answer and worked solution →A source e = 140 sin(3142t) volts is applied to a resistor. What is its frequency?Read the answer and worked solution →

Worked practice questions

Which principle lets a radio receiver select one station out of many?

  1. Rectification action
  2. Series LCR resonance
  3. Transformer induction
  4. Amplitude clipping
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Correct answer: B. Series LCR resonance

Only the signal whose frequency matches the circuit's resonant frequency drives a large current.

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In a radio tuner, which component is varied to pick a desired station?

  1. Resistance R
  2. Antenna length
  3. Capacitance C
  4. Supply voltage
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Correct answer: C. Capacitance C

Changing C shifts the resonant frequency to match the chosen station.

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What is the nature of the Q factor of a resonant circuit?

  1. Measured in henry
  2. Measured in hertz
  3. Measured in ohms
  4. Dimensionless
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Correct answer: D. Dimensionless

Q is a ratio of two frequencies (or of reactance to resistance), so it has no unit.

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