Transistor Applications and Characteristics

State three ways in which transistors are used.

• As amplifiers, switches, and signal modulators

• As resistors, capacitors, and inductors

• As diodes, transformers, and rectifiers

• As batteries, generators, and motors

What are the two main families of transistors?

• Bipolar Junction Transistors (BJT) and Field Effect Transistors (FET)

• Diodes and Resistors

• Capacitors and Inductors

• Integrated Circuits and Microcontrollers

In what two ways is the base region of a bipolar-junction transistor different from the emitter and collector?

• The base is thinner and less doped than the emitter and collector.

• The base is thicker and more doped than the emitter and collector.

• The base is the same thickness and doping level as the emitter and collector.

• The base is made of a different material than the emitter and collector.

The base region is used for which of the following purposes?

• To provide a foundation for structures

• To enhance aesthetic appeal

• To improve thermal insulation

• To increase structural height

What is the difference between the connection of an NPN and PNP BJT Circuit?

• NPN transistors are connected with the collector to positive voltage, while PNP transistors are connected with the collector to negative voltage.

• NPN transistors are connected with the emitter to positive voltage, while PNP transistors are connected with the emitter to negative voltage.

• NPN transistors are connected with the base to positive voltage, while PNP transistors are connected with the base to negative voltage.

• NPN transistors are connected with the collector to negative voltage, while PNP transistors are connected with the collector to positive voltage.

Name the two junctions found within a BJT.

• Emitter-Base and Collector-Base

• Emitter-Collector and Base-Collector

• Base-Emitter and Collector-Emitter

• Emitter-Base and Collector-Emitter

State the type of biasing used for each junction in order to produce the required transistor action.

• Forward bias for emitter-base junction and reverse bias for collector-base junction

• Reverse bias for emitter-base junction and forward bias for collector-base junction

• Forward bias for both emitter-base and collector-base junctions

• Reverse bias for both emitter-base and collector-base junctions

Compare the normal current flow through a forward-biased and reverse-biased junction.

• Forward-biased junction allows current to flow easily, while reverse-biased junction does not.

• Reverse-biased junction allows current to flow easily, while forward-biased junction does not.

• Both forward-biased and reverse-biased junctions allow current to flow easily.

• Neither forward-biased nor reverse-biased junctions allow current to flow easily.

With reference to a properly biased, complete BJT circuit: What determines the amount of collector current?

• Base current

• Collector voltage

• Emitter resistance

• Temperature

With no base current flowing, how much collector current is there?

• Zero

• Maximum

• Half of the maximum

• Depends on the circuit