BEE FREE BEE Bachelor of Electrical Engineering Semiconductor Devices and Circuits 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 operating in the saturation region, the drain current is primarily controlled by which parameter?

Accepted Answer

Gate-to-source voltage

Answer

Drain-to-source voltage

Answer

Substrate doping concentration

Answer

Channel length only

Question 3

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 breakdown

Answer

Kirk effect

Answer

Thermal runaway

Question 4

Which type of semiconductor recombination involves the emission of a photon?

Accepted Answer

Radiative recombination

Answer

Auger recombination

Answer

Shockley-Read-Hall recombination

Answer

Surface recombination

Question 5

What is the cutoff frequency of a common-emitter BJT amplifier primarily limited by?

Accepted Answer

Junction capacitances and transit time

Answer

Power supply voltage

Answer

Load resistance

Answer

Base doping concentration

Question 6

In a p-n junction solar cell, what generates the photocurrent?

Accepted Answer

Electron-hole pairs created in or near the depletion region

Answer

Majority carrier drift in the bulk

Answer

Tunneling through the junction barrier

Answer

Thermionic emission over the barrier