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Mixed Quiz
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1A bipolar junction transistor has three doped regions.
A)True
B)False


2In an npn transistor, the emitter and collector are both p-type materials.
A)True
B)False


3The emitter of a bipolar junction transistor is heavily doped and the base is lightly doped.
A)True
B)False


4The dc beta is defined as the dc collector current divided by the dc base current.
A)True
B)False


5The dc beta is also known as the current gain because a small emitter current controls a much larger collector current.
A)True
B)False


6When the ground side of each voltage source is connected to the emitter of a bipolar junction transistor, it is called a common emitter.
A)True
B)False


7A bipolar junction transistor should always operate in the active region.
A)True
B)False


8Small-signal transistors generally dissipate more than 1 watt.
A)True
B)False


9The power rating of a transistor can be increased by using shorter connection wires.
A)True
B)False


10The middle region of a transistor is the .


11The region of the transistor is physically the largest.


12 is the semiconductor material generally used in the manufacturing process of transistors.


13When working with transistor circuits, single subscripts are used to denote voltages.


14On the set of collector curves, the horizontal part of the curve where the collector current is constant, is known as the region.


15An instrument that graphically displays current versus the collector to emitter voltage is a curve tracer.


16Transistor saturation and cutoff regions are used in circuits referred to as circuits.


17The mount transistor is usually found in a simple three-terminal, gull-wing package.


18The two junctions of a transistor are between the emitter and the base and between the
A)collector and emitter
B)collector and base
C)collector and beta
D)base and committer


19A transistor’s current gain is equal to
A)collector current divided by emitter current
B)emitter current divided by base current
C)collector current divided by base current
D)base current divided by collector current


20When using double-subscript notation with transistor circuits and the subscripts are the same, the voltage represents
A)the voltage between two points
B)a voltage source
C)an ac source
D)the Thevenin’s voltage


21If the data sheet maximum rating, collector-emitter breakdown voltage is exceeded
A)current gain becomes maximum
B)the emitter will become reverse biased
C)the transistor will go into cut-off
D)the transistor will breakdown and will probably be destroyed


22The bulk resistance of the emitter diode becomes important
A)in low-power applications only
B)in high-power applications only
C)in low-frequency applications only
D)in high-frequency applications only


23The only way to keep a transistor case temperature at 25°C when the ambient temperature is 25°C is
A)to keep refrigerated
B)by keeping equipment chassis open
C)by bringing room temperature below 21°C
D)by fan-cooling or by using a heat sink


24What is the device that increases a transistor’s power rating by reducing the internal heat faster?
A)heater wire
B)chassis
C)grommet
D)heat sink


25When working with h parameter analysis, the symbol for current gain is
A)βdc
B)hFE
C) αFE
D)Δ





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