ECE21M03L01Q1

A transistor has how many pn junctions?

• 1
• 2
• 3
• 4

In an npn transistor, the majority carriers in the emitter are

• Free electrons
• Holes
• Neither
• Both

The barrier potential across each silicon depletion layer is

• 0 V
• 0.3 V
• 0.7 V
• 1 V

The emitter diode is usually

• Forward biased
• Reverse biased
• Nonconducting
• Operating in the breakdown region

For normal operation of the transistor, the collector diode has to be

• Forward biased
• Reverse biased
• Nonconducting
• Operating in the breakdown region

The base of an npn transistor is thin and

• Heavily doped
• Lightly doped
• Metallic
• Doped by a pentavalent material

Most of the electrons in the base of an npn transistor flow

• Out of the base lead
• Into the collector
• Into the emitter
• Into the base supply

The beta of a transistor is the ratio of the

• Collector current to emitter current
• Collector current to base current
• Base current to collector current
• Emitter current to collector current

Increasing the collector supply voltage will increase

• Base current
• Collector current
• Emitter current
• None of the above

The fact that there are many free electrons in a transistor emitter region means the emitter is

• Lightly doped
• Heavily doped
• Undoped
• None of the above