BEE BEE Bachelor of Electrical Engineering Semiconductor Devices and Electronics Questions and Answers 2

Question 1

What is the primary function of a Zener diode in a circuit?

Accepted Answer

Voltage regulation

Answer

Signal amplification

Answer

Current amplification

Answer

Frequency modulation

Question 2

In a MOSFET, what does the threshold voltage (Vth) represent?

Accepted Answer

The minimum gate-to-source voltage needed to create a conducting channel

Answer

The maximum drain-to-source voltage before breakdown

Answer

The voltage at which the device enters saturation

Answer

The forward voltage drop across the gate oxide

Question 3

Which semiconductor material has a bandgap energy of approximately 1.12 eV at room temperature?

Accepted Answer

Silicon

Answer

Germanium

Answer

Gallium arsenide

Answer

Silicon carbide

Question 4

What phenomenon causes the collector current in a BJT to increase slightly with increasing collector-emitter voltage in the active region?

Accepted Answer

Early effect

Answer

Avalanche multiplication

Answer

Thermal runaway

Answer

Kirk effect

Question 5

In a p-n junction, what is the built-in potential primarily caused by?

Accepted Answer

Diffusion of carriers across the junction creating an electric field

Answer

External bias applied to the junction

Answer

Recombination of electrons and holes

Answer

Thermal generation of electron-hole pairs

Question 6

What is the main advantage of a CMOS inverter compared to an NMOS-only inverter?

Accepted Answer

Near-zero static power dissipation

Answer

Higher switching speed

Answer

Smaller chip area

Answer

Lower threshold voltage