Test 9

Question 1

A ___ transistor is formed by sandwiching a thin layer of N-type material between two layers of P-type material.

Answer 1

PNP

Question 2

In both types of BJTs the terminal used is the ___.

Answer 2

All of the above

Question 3

The ___ current is a critical factor in determining the amount of current flow in a transistor.

Answer 3

Base

Question 4

In a transistor base circuit, ___ indicates the voltage drop across the base-emitter junction.

Answer 4

Vbe

Question 5

In a transistor collector circuit, ___ indicates the collector-emitter voltage.

Answer 5

Vce

Question 6

Transistor operating curves on a graph are known as collector ___ curves.

Answer 6

Characteristic

Question 7

The collector current (iC) on the vertical axis of a characteristic curve is measured in ___.

Answer 7

milliamps

Question 8

On a collector characteristic curve, a variety of base currents ranging from ___ to ___ are available.

Answer 8

0.1mA; 1.2mA

Question 9

A ___ region is the region of a characteristic curve in which maximum current can flow in a transistor circuit.

Answer 9

Saturation

Question 10

A ___ diode is a diode that prevents voltage from one part of a circuit from exceeding the voltage in another part.

Answer 10

Clamping

Question 11

With ___ bias, the amount of base current is dependent upon the value of the limiting resistor and the resistance of the base-emitter junction.

Answer 11

Base

Question 12

Bias stabilization circuits can be used to protect ___ in addition to heat sinking.

Answer 12

Transistor

Question 13

The most common bias stabilization circuit is the ___ bias stabilization circuit.

Answer 13

Emitter-feedback, Collector-feedback, combination. All of the above.

Question 14

An emitter-feedback bias stabilization circuit is created by placing a resistor in series with the ___.

Answer 14

emitter

Question 15

A combination bias stabilization circuit is created by both ___ -feedback and collector-feedback circuits.

Answer 15

emitter

Question 16

One of the greatest dangers to a transistor is ___, which causes excessive current flow and damage.

Answer 16

Heat

Question 17

___ can damage a transistor.

Answer 17

High voltages, Improper connections, Overheating

All of the above.

Question 18

A ___ is a point level measuring system that uses two electrodes to determine the level of liquid in a vessel.

Answer 18

None of the above

Question 19

When a transistor is turned all the way on it is said to be in the ___ mode.

Answer 19

Saturated

Question 20

When a transistor is turned all the way off it is said to be in the ___ mode.

Answer 20

Cutoff

Question 21

The two types of BJTs are NPN and PNP.

Answer 21

T

Question 22

BJTs are referred to as bipolar because both holes and electrons are used as internal carriers for maintaining electron flow.

Answer 22

T

Question 23

When a transistor with a specific shape must be used, a transistor model number is used for reference.

Answer 23

F

Question 24

In any transistor circuit, the base-emitter junction must always be reversed biased and the collector-base junction must always be forward biased.

Answer 24

F

Question 25

Individual PN junctions can be used in combination with three bias configurations.

Answer 25

F

Question 26

The base-emitter junction can be forward biased while the collector-base junction is reversed biased.

Answer 26

T

Question 27

One method of limiting the base current in a transistor is to use a series-limiting resistor.

Answer 27

T

Question 28

Transistors are manufactured to perform different functions under a variety of operating conditions.

Answer 28

T

Question 29

In a collector characteristic curve, the vertical axis indicates Vce.

Answer 29

F

Question 30

Collector characteristic curves are essential in predicting the operating condition of a transistor in a circuit.

Answer 30

T

Question 31

Current gain in a transistor is symbolized by the Greek letter beta.

Answer 31

T

Question 32

The primary motivation behind the rapid development of the transistor was to replace mechanical switching.

Answer 32

T

Question 33

Mechanical switches have two conditions: open and closed or ON and OFF.

Answer 33

T

Question 34

A transistor biased for saturation has the collector-base junction forward biased.

Answer 34

F

Question 35

Decreasing forward-bias voltage on a base causes the current through a transistor to increase.

Answer 35

F

Question 36

A transistor cannot be biased from a single fixed-voltage source.

Answer 36

F

Question 37

Bias stabilization circuits are designed to counteract the cumulative current increase due to a rise in temperature.

Answer 37

T

Question 38

Thermistors are also used for bias stabilization.

Answer 38

T

Question 39

In order to protect the transistor, the maximum power dissipation curve must be considered.

Answer 39

T

Question 40

In theory, a transistor should last indefinitely.

Answer 40

T

Question 41

To determine if a transistor is good or bad, a digital multi meter or a transistor tester can be used.

Answer 41

T

Question 42

Identifying an NPN and PNP transistor is good or bad, a digital multimeter or a transistor tester can be used.

Answer 42

F

Question 43

On a good transistor, one test lead should indicate the the junction has high resistance and is forward biased.

Answer 43

F

Question 44

A diode passes current when it is reversed biased.

Answer 44

F

Question 45

It is impossible to determine whether a transistor is switched ON or OFF just by visual inspection.

Answer 45

T

Question 46

The main components of a water level detector circuit consist of a simple, low-cost transistor and an electronic timer.

Answer 46

F

Question 47

In a beverage dispensing gun transistor, the base-emitter current is very high compared to the collector-emitter current.

Answer 47

F

Question 48

By switching various combinations of transistors ON or OFF, different numbers can be created on a seven-segment display.

Answer 48

T

Question 49

Transistors are used for switching because of their reliability and speed.

Answer 49

T

Question 50

High voltages, improper connections, and overheating can damage a transistor.

Answer 50

T