BJT DEVICES Flashcards
How much is the base-to-emitter
voltage of a transistor in the “on” state?
0.7V
How many layers of material does a
transistor have?
3
Which of the following equipment can
check the condition of a transistor?
Current tracer
Digital display meter (DDM)
Ohmmeter (VOM)
For what kind of amplifications can
the active region of the common-
emitter configuration be used?
Voltage
Current
Power
In the active region, while the
collector-base junction is ________-
biased, the base-emitter is ________-
biased.
reverse, forward
A transistor can be checked using a(n)
curve tracer
digital meter
ohmmeter
What range of resistor values would
you get when checking a transistor for
forward- and reverse-biased conditions
by an ohmmeter?
100 to a few kΩ, exceeding
100 kΩ
Calculate minority current ICO if IC =
20.002 mA and IC majority = 20 mA.
2 µA
What is (are) the component(s) of
electrical characteristics on the
specification sheets?
On
Off
Small-signal characteristics
In which region are both the
collector-base and base-emitter
junctions forward-biased?
Saturation
An example of a pnp silicon transistor
is a 2N4123
False
Which of the following is (are) the
terminal(s) of a transistor?
Emitter
Base
Collector
Which of the following
configurations can a transistor set up?
Common-base
Common-emitter
Common-collector
What does a reading of a large or
small resistance in forward- and reverse-
biased conditions indicate when checking a transistor using an
ohmmeter?
Faulty device
Determine the value of α when β =
100.
0.99
Transistors are ________-terminal
devices.
3
Which of the following can be
obtained from the last scale factor of a
curve tracer?
βac
βdc = ________
IC / IB
How many carriers participate in the
injection process of a unipolar device?
1
What are the ranges of the ac input
and output resistance for a common-
base configuration?
10Ω–100Ω , 50 kΩ –1 MΩ
What is the most frequently
encountered transistor configuration?
Common-emitter
Which of the following regions is
(are) part of the output characteristics of
a transistor?
Active
Cutoff
Saturation
How many individual pnp silicon
transistors can be housed in a 14-pin
plastic dual-in-line package?
4
In what decade was the first
transistor created?
1940s
Most specification sheets are broken
down into ________.
maximum ratings
thermal characteristics
electrical characteristics
For a properly biased pnp transistor,
let IC = 10 mA and IE = 10.2 mA. What is
the level of IB?
200 µA
What is βdc equal to?
IC / IB
List the types of bipolar junction
transistors.
pnp, npn
What is the ratio of the total width to
that of the center layer for a transistor?
150:1
Which component of the collector
current IC is called the leakage current?
Minority
