Analog to Digital: Mastering Exam Prep Techniques

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Analog to Digital

Q. What is the primary role of a capacitor in a rectifier circuit?

A. To increase the voltage
B. To filter out AC ripple
C. To amplify the signal
D. To switch the circuit on and off

Solution

In a rectifier circuit, a capacitor is used to filter out AC ripple, smoothing the output DC voltage.

Correct Answer: B — To filter out AC ripple

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Q. What is the primary role of a Zener diode in a circuit?

A. To rectify AC signals
B. To amplify signals
C. To provide voltage regulation
D. To switch currents

Solution

A Zener diode is used primarily for voltage regulation, as it allows current to flow in the reverse direction when a specific reverse voltage is reached.

Correct Answer: C — To provide voltage regulation

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Q. What type of rectifier uses both positive and negative halves of the AC waveform?

A. Half-wave rectifier
B. Full-wave rectifier
C. Bridge rectifier
D. Zener rectifier

Solution

A full-wave rectifier utilizes both halves of the AC waveform, allowing for more efficient conversion to DC compared to a half-wave rectifier.

Correct Answer: B — Full-wave rectifier

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Q. Which of the following is a characteristic of an ideal op-amp?

A. Infinite bandwidth
B. Finite input impedance
C. Non-infinite gain
D. Limited output voltage swing

Solution

An ideal operational amplifier is characterized by infinite bandwidth, infinite input impedance, and infinite gain, allowing for perfect signal amplification.

Correct Answer: A — Infinite bandwidth

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