FREE BEE Bachelor of Electrical Engineering Semiconductor Devices and Circuits Questions and Answers Flashcards
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Read the first 6 FREE BEE Bachelor of Electrical Engineering Semiconductor Devices and Circuits Questions and Answers flashcards as text
What is the primary function of a Zener diode in a circuit?
Answer: Voltage regulation
A Zener diode operates in reverse breakdown to maintain a constant voltage across its terminals, making it ideal for voltage regulation.
In a MOSFET operating in the saturation region, the drain current is primarily controlled by which parameter?
Answer: Gate-to-source voltage
In saturation, the MOSFET drain current depends on the gate-to-source voltage according to the square-law relationship and is nearly independent of drain-to-source voltage.
What phenomenon causes the collector current in a BJT to increase slightly with increasing collector-emitter voltage in the active region?
Answer: Early effect
The Early effect (base-width modulation) causes the effective base width to narrow as VCE increases, slightly increasing collector current.
Which type of semiconductor recombination involves the emission of a photon?
Answer: Radiative recombination
Radiative recombination occurs when an electron and hole recombine directly, releasing energy as a photon, which is the basis of LED operation.
What is the cutoff frequency of a common-emitter BJT amplifier primarily limited by?
Answer: Junction capacitances and transit time
The cutoff frequency is limited by the base-emitter and base-collector junction capacitances combined with carrier transit time through the base.
In a p-n junction solar cell, what generates the photocurrent?
Answer: Electron-hole pairs created in or near the depletion region
Photons absorbed in or near the depletion region create electron-hole pairs that are swept by the built-in electric field, producing photocurrent.