Quiz Chapter BJT

Bipolar junction transistor consist of three terminals which are:

• Emitter, source, base

• Gate, emitter, collector

• Emitter, base, collector

• Emitter, p-side and n-side

 In an NPN transistor, the N regions are

• emitter and base

• emitter and collector

• base and collector

• both collectors

Biasing mode where E-B junction is forward bias and C-B junction is reverse bias is known as?

• Inverted

• Active

• Saturation

• Cutoff

Which terminal is doped degenerately?

• Collector

• Emitter

• Base

• Gate

What is the common base current gain, and what range is the value of the gain?

• alpha, in range hundreds

• beta, in range hundreds

• alpha, in range 0.99

• beta, in range 0.99

Why is the base made thin compared to emitter and collector?

• to maximize the injection efficiency

• to minimize the collection efficiency

• to maximize the breakdown voltage

• to minimize the base transport efficiency

What is the reason for Emitters to be highly doped?

• to increase the emitter injection

  efficiency: the ratio of carriers injected by the emitter to those

  injected by the base.

• to increase the base injection

  efficiency: the ratio of carriers injected by the base to those

  injected by the emitter.

• to increase the collector injection

  efficiency: the ratio of carriers injected by the collector to those

  injected by the base.

• to increase the collector

  efficiency: the ratio of carriers injected by the collector to those

  injected by the emitter.

The region of a BJT that is lightly doped and very thin compared to other two regions

• emitter

• collector

• none

• base

The early effect in a BJT is caused by ………….

• fast turn-on

• large emitter-base forward bias

• fast turn-off

• large collector-base reverse bias

When the reverse bias voltage at C-B junction is too high, the width of base will decrease and causes:

• punch through effect

• cut-off effect

• large signal effect

• decrease in output