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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.

Read the first 6 CET Analog Electronics and Amplifiers flashcards as text

  1. What is the voltage gain of a common-emitter amplifier with a collector resistance of 1 kΩ and emitter resistance of 100 Ω (emitter unbypassed)?

    Answer: 10

    Voltage gain equals -Rc/Re; with 1000/100 the magnitude is 10.

  2. Which BJT amplifier configuration provides both voltage gain and current gain while inverting the output signal?

    Answer: Common-emitter

    The common-emitter configuration inverts the output and provides both voltage and current gain.

  3. What is the primary purpose of a bypass capacitor placed in parallel with the emitter resistor in an amplifier?

    Answer: Increase AC voltage gain by shorting the emitter resistor at signal frequencies

    The bypass capacitor shorts the emitter resistor at AC frequencies, removing negative feedback and increasing gain.

  4. In a differential amplifier, what does a high Common-Mode Rejection Ratio (CMRR) indicate?

    Answer: The amplifier effectively rejects signals common to both inputs

    A high CMRR means the amplifier amplifies differential signals while strongly rejecting common-mode (noise) signals present on both inputs.

  5. What is the ideal input impedance of an operational amplifier?

    Answer: Infinite

    An ideal op-amp has infinite input impedance so it draws no current from the signal source.

  6. Which amplifier class operates with the transistor conducting for less than 180° of the input cycle, improving efficiency at the cost of high distortion?

    Answer: Class C

    Class C amplifiers conduct for less than 180° of the cycle, making them very efficient but highly non-linear, so they are used with tuned circuits.