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

A Zener diode operates in reverse breakdown to maintain a constant voltage across its terminals, making it ideal for voltage regulation.

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 threshold voltage is the minimum gate-to-source voltage required to form an inversion layer and create a conductive channel between source and drain.

Question 3

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

Accepted Answer

Silicon

Answer

Silicon has a bandgap energy of approximately 1.12 eV at 300 K, which is fundamental to its widespread use in electronics.

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

The Early effect (base-width modulation) causes the effective base width to narrow as VCE increases, slightly increasing collector current.

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

The built-in potential arises from carrier diffusion across the junction, which creates a depletion region and an internal electric field that opposes further diffusion.

BEE - Bachelor of Electrical Engineering Practice Test

BEE - Bachelor of Electrical Engineering Practice Test

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