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Frequency Response MCQs

Practice Frequency Response MCQs with four options, answers and explanations for focused Electronics & Telecommunication Engineering revision.

Question 1
Analog ElectronicsFrequency Response

The lower cutoff frequency of an RC-coupled amplifier is mainly influenced by?

  • ACoupling and bypass capacitors
  • BTransistor breakdown voltage only
  • CPower-supply frequency only
  • DCollector color code
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Correct Answer: A. Coupling and bypass capacitors
Explanation: At low frequencies, coupling and emitter-bypass capacitor reactances become significant and reduce gain.
Reference: Standard analog electronics: frequency response
Question 2
Analog ElectronicsFrequency Response

At high frequencies, the gain of a transistor amplifier generally falls mainly because of?

  • AJunction and stray capacitances
  • BCoupling capacitors becoming open circuits only
  • CDC bias becoming exactly zero
  • DLoad resistance becoming infinite
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Correct Answer: A. Junction and stray capacitances
Explanation: Internal junction capacitances, wiring capacitance and related high-frequency effects reduce amplifier gain.
Reference: Standard analog electronics: frequency response
Question 3
Analog ElectronicsFrequency Response

The Miller effect in an inverting voltage amplifier effectively makes a feedback capacitance between input and output appear at the input as?

  • AA reduced capacitance only
  • BAn increased effective capacitance
  • CZero capacitance
  • DA pure inductance
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Correct Answer: B. An increased effective capacitance
Explanation: Because the output is amplified and inverted, a capacitance bridging input and output can appear as a much larger effective input capacitance.
Reference: Standard analog electronics: frequency response
Question 7
Analog ElectronicsFrequency Response

If two identical noninteracting first-order amplifier stages are cascaded, the overall response near their individual cutoff frequencies is generally?

  • AExactly identical to one stage
  • BAffected because the stage responses multiply
  • CAlways flat at all frequencies
  • DIndependent of each stage response
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Correct Answer: B. Affected because the stage responses multiply
Explanation: The overall transfer magnitude is the product of individual stage magnitudes, so cascading alters the composite cutoff behavior.
Reference: Standard analog electronics: frequency response
Question 8
Analog ElectronicsFrequency Response

In a BJT amplifier, the Miller effect associated with collector-base capacitance is especially important in which configuration?

  • ACommon-emitter voltage amplifier
  • BEmitter follower with exactly unity gain
  • CCommon-base stage with no inversion
  • DDC current mirror only
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Correct Answer: A. Common-emitter voltage amplifier
Explanation: The relatively large inverting voltage gain of a common-emitter stage can multiply the effective input capacitance caused by collector-base capacitance.
Reference: Standard analog electronics: frequency response
Question 13
Signals & SystemsFrequency Response

If an LTI system has H(jω)=0 at ω=100 rad/s, a sinusoidal component exactly at 100 rad/s is ideally?

  • APassed unchanged
  • BCompletely rejected
  • CFrequency doubled
  • DConverted to DC
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Correct Answer: B. Completely rejected
Explanation: A zero frequency-response magnitude at that frequency means the corresponding sinusoidal steady-state component is suppressed.
Reference: Standard signals and systems: frequency response
Question 14
Control SystemsFrequency Response

For a minimum-phase stable loop, larger positive phase margin generally indicates?

  • AGreater relative stability and damping tendency
  • BGuaranteed instability
  • CZero bandwidth
  • DInfinite steady-state error
Report an error
Correct Answer: A. Greater relative stability and damping tendency
Explanation: Within ordinary design tradeoffs, a larger positive phase margin generally corresponds to greater relative stability and a more damped closed-loop response.
Reference: Standard control systems: frequency response