Circuits and Resonance Questions and Answers

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Q21
In a CE amplifier, the input impedance is primarily determined by:
  • A Collector resistor
  • B Base resistor
  • C Emitter resistor
  • D Load resistor
Answer: Option C
Explanation: Input impedance ≈ β × re where re is emitter resistance
Q22
What is the ripple factor of a full-wave rectifier?
  • A 0.482
  • B 1.21
  • C 0.8
  • D 1.0
Answer: Option A
Explanation: Ripple factor = 0.48 for full-wave rectifier
Q23
The resonant frequency of a tank circuit is given by:
  • A 1/2πRC
  • B 1/2π√LC
  • C 2π/√LC
  • D RC/2π
Answer: Option B
Explanation: f = 1/(2π√LC) for both series and parallel resonance
Q24
In a voltage divider bias circuit, the purpose of emitter resistor is:
  • A Increase gain
  • B Provide thermal stability
  • C Reduce noise
  • D Block DC
Answer: Option B
Explanation: Emitter resistor provides stability against temperature variations
Q25
What is the typical input impedance of an op-amp?
  • A Very low
  • B About 1kΩ
  • C About 10kΩ
  • D Very high
Answer: Option D
Explanation: Op-amps have very high input impedance, typically >1MΩ
Q26
The gain-bandwidth product of an op-amp is:
  • A Variable
  • B Zero
  • C Constant
  • D Infinite
Answer: Option C
Explanation: GBP is constant for a given op-amp, Gain × Bandwidth = constant
Q27
In a clipper circuit, the diode is used to:
  • A Amplify signals
  • B Generate oscillations
  • C Clip waveform portions
  • D Regulate voltage
Answer: Option C
Explanation: Clippers remove portions of input waveform above/below reference
Q28
What is the function of a clamper circuit?
  • A Amplify AC signals
  • B Shift DC level
  • C Filter noise
  • D Generate pulses
Answer: Option B
Explanation: Clampers shift DC level of input signal without distorting shape
Q29
The h-parameter equivalent circuit is used for:
  • A Power analysis
  • B Large signal analysis
  • C Small signal analysis
  • D DC analysis only
Answer: Option C
Explanation: h-parameters are used for small-signal analysis of transistors
Q30
In a Colpitts oscillator, the feedback is obtained from:
  • A Inductive divider
  • B Capacitive divider
  • C Resistive divider
  • D Transformer coupling
Answer: Option B
Explanation: Colpitts uses capacitive voltage divider for feedback

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