Semiconductors

The forward voltage across a conducting silicon diode is about

A:

0.3 V.

B:

1.7 V.

C:

–0.7 V.

D:

0.7 V.

Answer: D

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Doping of a semiconductor material means

A:

that a glue-type substance is added to hold the material together.

B:

that impurities are added to increase the resistance of the material.

C:

that impurities are added to decrease the resistance of the material.

D:

that all impurities are removed to get pure silicon.

Answer: C

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As the forward current through a silicon diode increases, the voltage across the diode

A:

increases to a 0.7 V maximum.

B:

decreases.

C:

is relatively constant.

D:

decreases and then increases.

Answer: C

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There is a small amount of current across the barrier of a reverse-biased diode. This current is called

A:

forward-bias current.

B:

reverse breakdown current.

C:

conventional current.

D:

reverse leakage current.

Answer: D

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Reverse breakdown is a condition in which a diode

A:

is subjected to a large reverse voltage.

B:

is reverse-biased and there is a small leakage current.

C:

has no current flowing at all.

D:

is heated up by large amounts of current in the forward direction.

Answer: A

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Questions for: Semiconductors