Basics of Diodes and Semiconductors Quiz

What is the primary function of an ideal diode?

• Amplify current in both directions

• Store electrical energy

• Allow current in one direction only

• Block voltage in both directions

In a pure semiconductor, conduction occurs due to:

• External voltage only

• Majority charge carriers

• Movement of free electrons and holes

• Dopants added to the material

What happens when a p-type and n-type material are joined?

• Conduction stops

• A depletion layer is formed

• Heat is generated

• The material becomes an insulator

What is the term for the small current that flows in a reverse-biased pn junction due to minority carriers?

• Diffusion current

• Leakage current

• Conduction current

• Avalanche current

A typical silicon diode begins to conduct at a voltage of:

• 0.1 V

• 0.3 V

• 0.7 V

• 1.2 V

Which of the following diodes is fastest in operation due to use of majority carriers only?

• Tunnel diode

• Varactor diode

• Zener diode

• Schottky diode

Which diode operates in reverse breakdown to maintain a stable output voltage?

• Tunnel diode

• Zener diode

• Varactor diode

• Schottky diode

What is the main purpose of a reservoir capacitor in a half-wave rectifier?

• Store charge for future use

• Increase the output voltage

• Produce a steadier output by reducing ripple

• Reverse the current flow

Which circuit allows rectification during both halves of the AC input cycle?

• Half-wave rectifier

• Full-wave rectifier

• Bridge oscillator

• Peak detector

What is the output voltage of a Zener diode regulator when the breakdown voltage is VZ?

• Greater than VZ

• Equal to VZ

• Less than VZ

• Varies with input