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CET Analog Electronics and Amplifiers Flashcards

6 cards from real CET practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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  1. What is the cutoff frequency of a first-order RC low-pass filter with R = 10 kΩ and C = 0.01 µF?

    Answer: 1.59 kHz

    f = 1/(2πRC) = 1/(2π × 10,000 × 0.00000001) ≈ 1,592 Hz ≈ 1.59 kHz.

  2. An inverting op-amp amplifier has a feedback resistor Rf = 10 kΩ and input resistor Rin = 2 kΩ. What is the closed-loop voltage gain?

    Answer: -5

    Inverting amplifier gain = -Rf/Rin = -10k/2k = -5.

  3. Which type of negative feedback increases input impedance and decreases output impedance in an amplifier?

    Answer: Voltage-series (series-shunt) feedback

    Voltage-series (series-shunt) feedback samples the output voltage and applies series feedback at the input, raising Zin and lowering Zout.

  4. What does the slew rate of an op-amp specify?

    Answer: The maximum rate of change of output voltage in V/µs

    Slew rate defines the fastest the output voltage can change, expressed in volts per microsecond.

  5. Which amplifier class has the highest theoretical DC-to-output efficiency, reaching up to 78.5% for a sinusoidal signal?

    Answer: Class B

    Class B push-pull amplifiers have a theoretical maximum efficiency of 78.5% because each transistor conducts only 180° of the cycle.

  6. What is the primary purpose of coupling capacitors between amplifier stages?

    Answer: Pass AC signals while blocking DC bias levels between stages

    Coupling capacitors block DC so each stage maintains its own independent bias, while passing the AC signal to the next stage.

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