elecs 2 diodes

Which statement best explains why a depletion region forms immediately after a P-N junction is created?

Electrons and holes recombine, leaving fixed ions behind.

The primary function of the depletion region is to:

Restrict current flow until sufficient forward voltage is applied

The barrier potential in a silicon diode is approximately:

0.6–0.7 V

Which material has the lower barrier potential?

Germanium

A diode becomes highly conductive when:

Forward biased beyond its barrier potential

During forward bias, the depletion region:

Narrows

During reverse bias:

Majority carriers move away from the junction

Which statement correctly describes leakage current?

It is a very small reverse current that increases with temperature.

Avalanche breakdown occurs because:

The reverse voltage exceeds a critical value.

Which diode condition produces low resistance in both directions on an analog multimeter?

Shorted diode

A silicon diode is connected with + to the anode and − to the cathode. The supply is 0.4 V. The diode will most likely:

Remain essentially OFF because the applied voltage is below the typical barrier potential

A diode measures infinite resistance in both directions. It is most likely:

Open

Which change increases reverse leakage current the most?

Increasing temperature

The fixed ions remaining in the depletion region create the:

Electric field

The purpose of forward bias is primarily to:

Reduce the barrier potential so current can flow

Which sequence correctly describes current conduction in a silicon diode under forward bias?

Depletion narrows → barrier decreases → current increases

A reverse-biased diode suddenly conducts a very large current after the reverse voltage exceeds its safe limit. This phenomenon is:

Avalanche breakdown

Which pair is correctly matched?

Forward bias — Conductor

Which of the following is NOT part of a diode's physical construction?

Rotor

Why is a diode often described as an "electronic one-way valve"?

It allows current to flow mainly in one direction.

Which statement about the depletion region is FALSE?

It is the region where current flows most easily.

In a reverse-biased diode, increasing the reverse voltage (below breakdown) mainly causes the depletion region to:

Widen

A germanium diode and a silicon diode are forward biased with the same voltage of 0.4 V. Which is more likely to conduct significantly?

Germanium diode only

Which statement best explains why the electric field forms across the P-N junction?

Fixed positive and negative ions remain after recombination.

Which terminal of a diode is connected to the P-type material?

Anode

A good diode tested with an analog multimeter should show:

Low resistance in one direction and high resistance in the other.

Which quantity must be overcome before significant forward current can flow?

Barrier potential

Which factor has the greatest effect on reverse leakage current according to the module?

Temperature

If a diode is accidentally connected in reverse across a power supply with excessive voltage, the greatest risk is:

Avalanche breakdown and possible damage

Which sequence correctly summarizes the operation of a P-N junction before any external voltage is applied?

Diffusion → recombination → depletion region → electric field → barrier potential