Electronics Chapter on Rectifiers and Transistors

Which of the following components is not a part of a simple half-wave rectifier circuit?

In a full-wave rectifier, current flows through the load resistor in both the positive and negative half cycles of the input waveform.

What is the main advantage of using a bridge rectifier compared to a center-tapped transformer rectifier?

In a bridge rectifier, the two diodes that conduct current during the positive half cycle of the supply are ______ and ______.

Match the following rectifier types with their corresponding descriptions:

What is the purpose of the load resistor in a rectifier circuit?

In a bridge rectifier, all four diodes conduct simultaneously.

What is the main advantage of using a full-wave rectifier over a half-wave rectifier?

What are the two outer regions of a transistor called?

The base region of a transistor is heavily doped.

Transistors are called ______ transistors because they utilize two types of charge carriers: electrons and holes.

Match the following transistor regions with their primary function:

What is the primary purpose of the base region in a transistor?

The emitter-base junction of a transistor is always reverse-biased.

Explain why the base region is lightly doped in a transistor.

Which of the following statements accurately describes the biasing of a transistor in active mode?

In a Hall coefficient experiment, what is the relationship between the Hall voltage (VH), the magnetic field (B), the current (I), and the carrier concentration (n)?

The Hall coefficient is always positive, regardless of the type of charge carrier.

The Hall coefficient is measured in units of ______.

What is the primary factor that determines the drift velocity of charge carriers in a material?

Explain the concept of Hall mobility and how it relates to both the Hall coefficient and the resistivity of a material.

Match the following physical quantities with their correct units.

What is the relationship between Hall angle, resistivity, and Hall coefficient?

In a Hall effect experiment, the higher the carrier concentration, the larger the Hall voltage will be for a given current and magnetic field.

The change in collector current (∆Ic) due to variation in emitter current (∆Ie) is given by ∆Ic = ______ * ∆Ie.

The Hall Effect occurs when a current-carrying material is placed in a magnetic field, resulting in a potential difference perpendicular to both the field and current directions.

What is the approximate value of α (current gain) in a transistor?

In a semiconductor sample with a Hall coefficient of -0.0125 m³/C and an applied electric field of 100 V/m, what is the current density if the electron mobility is 0.36 m²/Vs?

Which of the following factors contributes to the amplification of a small input voltage to a larger output voltage in a transistor?

The Hall voltage (VH) is directly proportional to the ______ coefficient and the magnetic field strength.

Match the following terms with their corresponding definitions.

What is the unit of Hall coefficient?

The Hall angle is the angle between the direction of the current flow and the direction of the Hall voltage.

What is the relationship between α and β (current gains) in a transistor?

In a semiconductor specimen with a thickness of 1 mm, a current of 10 mA, and a Hall coefficient of 3.66 × 10⁻⁴ m³/C, what is the Hall voltage if the magnetic field is 0.5 T?

Match the following variables with their corresponding units:

The Hall voltage is a measure of the ______ field induced across a conductor carrying current in a magnetic field.

If a semiconducting plate with a thickness of 2 mm experiences a Hall voltage of 1.62 mV when subjected to a magnetic field of 0.6 Wb/m² and carrying a current of 1.5 × 10⁻² A, what is the Hall coefficient of the material?

A wider base region in a transistor would result in a smaller base current.

Which of the following is NOT a reason for the collector region of a transistor to be larger?

The ______ terminal of a transistor is common to both the input and output circuits in a common base configuration.

Why is the emitter heavily doped in a transistor?

Explain the difference between the common base and common emitter transistor configurations.

Match the transistor region with its primary function:

Which of the following factors contribute to a higher base current in a transistor?

What is the primary function of the base region in a transistor?