Quiz on PN Junctions and Diodes

What forms the depletion region in a PN junction?

• Excess electrons and holes

• A region of immobile ions

• Conducting carriers

• None of the above

In a PN junction at equilibrium, the electric field in the depletion region:

• Points from the P-side to the N-side

• Points from the N-side to the P-side

• Is zero

• Oscillates periodically

What happens to the width of the depletion region when the PN junction is forward biased?

• Increases

• Decreases

• Remains the same

• Vanishes

In reverse bias, the current through the PN junction is mainly due to:

• Majority carriers

• Minority carriers

• Depletion region ions

• Electrons only

In a PN junction, majority carriers on the N-side are:

• Holes

• Electrons

• Ions

• Both electrons and holes

What is the primary effect of forward biasing a PN junction?

• Increases the width of the depletion region

• Reduces the barrier potential

• Increases resistance across the junction

• Creates an open circuit

Which type of current flows in a PN junction under forward bias?

• Drift current

• Diffusion current

• Reverse current

• Leakage current

The reverse saturation current in a PN junction is:

• Independent of temperature

• Proportional to the applied voltage

• Very small and primarily due to minority carriers

• Caused by majority carriers

Which of the following increases with an increase in temperature in a PN junction?

• Depletion region width

• Barrier potential

• Reverse saturation current

• Breakdown voltage

What happens to the current in a diode when reverse bias is applied and the breakdown voltage is reached?

• The current becomes zero

• The current remains constant

• The current increases rapidly

• The diode gets forward biased