BJT DEVICES

Question 1

How much is the base-to-emitter
voltage of a transistor in the “on” state?

Answer 1

0.7V

Question 2

How many layers of material does a
transistor have?

Answer 2

3

Question 3

Which of the following equipment can
check the condition of a transistor?

Answer 3

Current tracer
Digital display meter (DDM)
Ohmmeter (VOM)

Question 4

For what kind of amplifications can
the active region of the common-
emitter configuration be used?

Answer 4

Voltage
Current
Power

Question 5

In the active region, while the
collector-base junction is ________-
biased, the base-emitter is ________-
biased.

Answer 5

reverse, forward

Question 6

A transistor can be checked using a(n)

Answer 6

curve tracer
digital meter
ohmmeter

Question 7

What range of resistor values would
you get when checking a transistor for
forward- and reverse-biased conditions
by an ohmmeter?

Answer 7

100 to a few kΩ, exceeding
100 kΩ

Question 8

Calculate minority current ICO if IC =
20.002 mA and IC majority = 20 mA.

Answer 8

2 µA

Question 9

What is (are) the component(s) of
electrical characteristics on the
specification sheets?

Answer 9

On
Off
Small-signal characteristics

Question 10

In which region are both the
collector-base and base-emitter
junctions forward-biased?

Answer 10

Saturation

Question 11

An example of a pnp silicon transistor
is a 2N4123

Answer 11

False

Question 12

Which of the following is (are) the
terminal(s) of a transistor?

Answer 12

Emitter
Base
Collector

Question 13

Which of the following
configurations can a transistor set up?

Answer 13

Common-base
Common-emitter
Common-collector

Question 14

What does a reading of a large or
small resistance in forward- and reverse-
biased conditions indicate when checking a transistor using an
ohmmeter?

Answer 14

Faulty device

Question 15

Determine the value of α when β =
100.

Answer 15

0.99

Question 16

Transistors are ________-terminal
devices.

Answer 16

3

Question 17

Which of the following can be
obtained from the last scale factor of a
curve tracer?

Answer 17

βac

Question 18

βdc = ________

Answer 18

IC / IB

Question 19

How many carriers participate in the
injection process of a unipolar device?

Answer 19

1

Question 20

What are the ranges of the ac input
and output resistance for a common-
base configuration?

Answer 20

10Ω–100Ω , 50 kΩ –1 MΩ

Question 21

What is the most frequently
encountered transistor configuration?

Answer 21

Common-emitter

Question 22

Which of the following regions is
(are) part of the output characteristics of
a transistor?

Answer 22

Active
Cutoff
Saturation

Question 23

How many individual pnp silicon
transistors can be housed in a 14-pin
plastic dual-in-line package?

Answer 23

4

Question 24

In what decade was the first
transistor created?

Answer 24

1940s

Question 25

Most specification sheets are broken
down into ________.

Answer 25

maximum ratings
thermal characteristics
electrical characteristics

Question 26

For a properly biased pnp transistor,
let IC = 10 mA and IE = 10.2 mA. What is
the level of IB?

Answer 26

200 µA

Question 27

What is βdc equal to?

Answer 27

IC / IB

Question 28

List the types of bipolar junction
transistors.

Answer 28

pnp, npn

Question 29

What is the ratio of the total width to
that of the center layer for a transistor?

Answer 29

150:1

Question 30

Which component of the collector
current IC is called the leakage current?

Answer 30

Minority