Quantum Mechanics and BJTs Quiz

Which quantum mechanical effect is primarily responsible for Zener breakdown?

• Photoelectric effect

• Compton scattering

• Tunneling

• Thermionic emission

In the diode equation, what happens to the current if V becomes significantly larger than nVt?

• It saturates

• It approaches Is

• It increases linearly

• It increases exponentially

The base width modulation in BJTs is responsible for which phenomenon?

• Thermal runaway

• Early effect

• Zener effect

• Avalanche multiplication

Which parameter best quantifies the sharpness of the knee in a Zener diode I-V curve?

• Zener resistance

• Breakdown voltage

• Zener impedance

• Reverse saturation current

How does increasing the doping in a P-N junction affect the built-in potential (Vbi)?

• Decreases

• Remains constant

• Increases

• Depends on temperature only

Which current component is negligible in the reverse-biased base-emitter junction of a BJT?

• Hole current

• Diffusion current

• Drift current

• Minority carrier current

The transition capacitance of a P-N junction diode increases when:

• Forward biased

• Reverse biased and voltage increases

• Reverse biased and voltage decreases

• Connected in series

What does the term 'saturation' in a BJT imply regarding junction biases?

• Both junctions reverse biased

• Base-emitter forward, base-collector reverse

• Base-emitter reverse, base-collector forward

• Both junctions forward biased

What effect does high-frequency operation have on the BJT performance?

• Increases β

• Reduces transit time

• Increases junction capacitance effect

• Increases current gain

What causes base current in a BJT to increase with temperature?

• Reduced mobility

• Increased minority carrier injection

• Thermal runaway

• Decreased emitter efficiency