Semiconductor and Diode

What is a semiconductor?

• Material with very high conductivity

• Material with zero conductivity

• Material with conductivity between conductor and insulator

• Material with only negative charge carriers

Which of the following is an intrinsic semiconductor?

• Pure silicon

• Silicon doped with phosphorus

• Germanium with boron

• Copper

N-type semiconductor is formed by doping with which element?

• Trivalent

• Pentavalent

• Divalent

• Hexavalent

The majority charge carriers in P-type semiconductors are:

• Electrons

• Holes

• Ions

• Protons

Drift current in a semiconductor occurs due to:

• Movement of charge carriers under an electric field

• Movement due to concentration gradient

• Thermal agitation

• Magnetic field

Diffusion current in a semiconductor arises from:

• Uniform charge carrier density

• Applied electric field

• Movement from higher to lower concentration

• Application of pressure

The PN junction diode allows significant current flow when:

• Reverse biased

• Forward biased

• No bias

• Both forward and reverse biased

Which biasing makes a PN junction diode act as an insulator?

• Forward bias

• Reverse bias

• Both

• Zero bias

Zener diodes are especially designed to operate in:

• Forward bias only

• Reverse bias only

• Both bias

• No bias

The main characteristic of an avalanche breakdown in a diode:

• Minority carriers dominate

• Sudden increase in current due to high reverse voltage

• Constant current

• No current