Quiz 1

In an intrinsic semiconductor,

• There are no free electrons

• The free electrons are thermally produced

• There are only holes

• There are as many electrons as there are holes

Holes in an n-type semiconductor are

• Minority carriers that are thermally produced

• Minority carriers that are produced by doping

• Majority carriers that are thermally produced

• Majority carriers that are produced by doping

The depletion region is created by

(a) (b) (c) (d)

• Ionization

• Diffusion

• Recombination

• Answers (a), (b), and (c)

Recombination is when

• An electron falls into a hole

• A positive and a negative ion bond together

• A valence electron becomes a conduction electron

• A crystal is formed

In a p-type semiconductor,

• There are more holes than electrons

• Electrons are the majority carriers

• Holes are produced by thermal excitation

• There are no free holes

The process of doping a semiconductor involves

• Cooling the material

• Answers (a) and (b)

• Adding impurities

• Removing electrons

In an n-type semiconductor, the majority carriers are

• Electrons that are thermally produced

• Holes that are produced by doping

• Holes that are thermally produced

• Electrons that are produced by doping

When a diode is forward-biased and the bias voltage is increased, the forward current will
(a) (b) decrease (c)

• Increase

• Decrease

• Increase and decrease

• not change

When a diode is reverse-biased and the bias voltage is increased, the reverse current (assuming the practical model) will

• increase

• decrease

• not change

In Ideal diode, the current proceed in ______?

• Unidirectional

• Bidirectional

• Multiple directions

• Both directions