Diode Functionality and Characteristics

The video tutorial explains the role of diodes in electronics, focusing on the PN junction diode. It covers the basics of semiconductors, including their classification and properties, with a focus on silicon. The process of doping to enhance conductivity is discussed, followed by the construction of a PN junction diode. The video also explains diode biasing, both forward and reverse, and the VI characteristics of diodes, highlighting how they control current flow in circuits.

What is the primary function of a diode in an electronic circuit?

• To amplify signals

• To store electrical energy

• To allow current to flow in one direction

• To convert AC to DC

Which material is known for having very high electrical conductivity?

• Plastic

• Silicon

• Germanium

• Copper

What is the role of doping in semiconductors?

• To improve the semiconductor's conductivity

• To decrease the semiconductor's temperature

• To change the color of the semiconductor

• To increase the size of the semiconductor

What type of impurity is added to create a p-type semiconductor?

• Hexavalent impurity

• Trivalent impurity

• Monovalent impurity

• Pentavalent impurity

What happens at the atomic level in a p-n junction diode?

• No movement occurs at the junction

• Electrons move away from the junction

• Holes move away from the junction

• Electrons and holes recombine at the junction

What is the barrier potential in a diode?

• The voltage at which a diode breaks down

• The maximum voltage a diode can handle

• The potential difference across the depletion region

• The voltage required to start current flow

In reverse biasing, what happens to the current flow in a diode?

• Current is amplified

• Current is blocked

• Current flows freely

• Current is converted to AC

What occurs when a diode is forward biased?

• The diode blocks current

• The diode allows current to flow

• The diode amplifies the current

• The diode converts current to AC

What describes the VI characteristics of a diode in forward biasing?

• Current decreases with increasing voltage

• Current flows in reverse direction

• Current starts flowing when voltage exceeds the barrier potential

• Current remains constant regardless of voltage

What happens to a diode when the reverse voltage is increased beyond a certain point?

• The diode starts conducting in reverse

• The diode converts to a p-type semiconductor

• The diode stops conducting completely

• The diode breaks down and current rises suddenly