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Chapter 39: Problem 2920

To get a constant dc voltage from the dc unregulated output of a rectifier. We use (A) Oscillator (B) amplifier (C) zener diode (D) pacifier

Short Answer

Expert verified
The correct component for obtaining a constant DC voltage from the DC unregulated output of a rectifier is a Zener diode (Option C). This is because it operates in the reverse breakdown region and can maintain a constant voltage across the load even with fluctuations in the input voltage or load current.

Step by step solution

01

Option A: Oscillator

An oscillator is a component that generates a periodic waveform, such as a sine wave, square wave, or triangle wave, at a specific frequency. It is typically used in applications requiring a steady clock signal, like digital circuits or communication systems. This component wouldn't be able to provide a constant DC voltage, as it generates AC waveforms. Therefore, Option A is not suitable.
02

Option B: Amplifier

An amplifier is a component that increases the amplitude of a signal without changing the shape of the wave. It is used in various applications like audio systems, communication systems, and control systems. Amplifiers can amplify DC signals, but they are not designed to regulate the output voltage. Thus, Option B is not suitable either.
03

Option C: Zener Diode

A Zener diode is a special type of diode that operates in the reverse breakdown region. When the voltage across the diode exceeds a specific threshold (the Zener voltage), the diode starts conducting in the reverse direction, and the voltage across it becomes nearly constant. By connecting the Zener diode in parallel with the load, the voltage across the load remains constant even with fluctuations in the input voltage or the load current. This characteristic of Zener diodes makes them suitable for voltage regulation in DC circuits. Therefore, Option C is the correct choice for obtaining a constant DC voltage from the unregulated output of a rectifier.
04

Option D: Pacifier

A pacifier is not an electronic component. It's an object used by babies to calm and soothe themselves. Thus, Option D is not relevant to the problem. In conclusion, from the given options, a Zener diode is the most suitable component for obtaining a constant DC voltage from the DC unregulated output of a rectifier.

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Most popular questions from this chapter

Avalanche breakdown in a semiconductor diode happens when (A) forward bias exceeds a certain value (B) forward current exceeds a certain value (C) reverse bias exceed a certain value (D) the potential barrier is reduced to zero

What constitutes the reverse current? (A) holes in both \(\mathrm{p}\) and \(\mathrm{n}\) type. (B) free electrons in both \(\mathrm{p}\) and \(\mathrm{n}\) type (C) free electrons in p-type and holes in n-type (D) holes in p-type and free electrons in n-type.

The zener voltage of a zener diode is kept at a desired value by (A) adjustment the input voltage (B) adjustment the input current (C) by connecting an appropriate resistance in series (D) changing the level of doping

Zener diodes are used as (A) amplifiers (B) voltage regulators (C) oscillators (D) half-wave rectifiers

For the same density of impurity atoms, Zener voltage is (A) same for both Ge and Si (B) higher for Ge than for \(\mathrm{Si}\) (C) higher for silicon than for germanium (D) none of the above
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