Transcript chapter quiz

OBJECTIVES
After studying Chapter 13, the reader should be able to:
1. Prepare for ASE Electrical/Electronic Systems
(A6) certification test content area “A” (General
Electrical/Electronic Systems).
2. Explain magnetism.
3. Describe how magnetism and voltage are related.
4. Describe how an ignition coil works.
5. Explain how an electromagnet works.
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
FUNDAMENTALS OF MAGNETISM
• Magnetism is a form of
energy that is caused by
the motion of electrons in
some materials.
• It is recognized by the
attraction it exerts on other
materials.
FIGURE 13-1 A freely suspended
natural magnet will point toward
the magnetic north pole.
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
A CRACKED MAGNET BECOMES TWO MAGNETS
• Magnets are commonly
used in vehicle crankshaft,
camshaft, and wheel speed
sensors.
• A typical problem occurs
when a magnetic
crankshaft sensor becomes
cracked, resulting in a nostart condition.
FIGURE 13-2 If a magnet breaks or is
cracked, it becomes two weaker magnets.
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
FUNDAMENTALS OF MAGNETISM
Lines of Force
• The lines that create a field
of force around a magnet
are believed to be caused
by the way groups of atoms
are aligned in the magnetic
material.
FIGURE 13-3 Magnetic lines of force
leave the north pole and return to the
south pole of a bar magnet.
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
FUNDAMENTALS OF MAGNETISM
Lines of Force
• The more lines of force that exist, the stronger the
magnet.
• The magnetic lines of force, also called magnetic
flux or flux lines, form a magnetic field.
• Flux density refers to the number of flux lines per
unit of area.
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
FUNDAMENTALS OF MAGNETISM
Lines of Force
FIGURE 13-4 Iron filings on a compass can be
used to observe the magnetic lines of force.
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
FUNDAMENTALS OF MAGNETISM
Magnetic Induction
• If a piece of iron or steel is placed in a magnetic
field, it will also become magnetized.
• This process of creating a magnet by using a
magnet field is called magnetic induction.
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
FUNDAMENTALS OF MAGNETISM
Attracting or Repelling
• The poles of a magnet are called north (N) and south (S) because, when
a magnet is suspended freely, the poles tend to point toward the North
and South poles of the Earth.
FIGURE 13-5 Magnetic poles behave like electrically charged
particles—unlike poles attract and like poles repel.
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
FUNDAMENTALS OF MAGNETISM
Permeability
• Magnetic flux lines cannot be insulated.
• There is no known material through which magnetic
force does not pass, if the force is strong enough.
• However, some materials allow the force to pass
through more easily than others.
• This degree of passage is called permeability.
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
FUNDAMENTALS OF MAGNETISM
Reluctance
• Although there is no absolute insulation for
magnetism, certain materials resist the passage of
magnetic force.
• This can be compared to resistance without an
electrical circuit.
• Air does not allow easy passage, so air has a high
reluctance.
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
ELECTROMAGNETISM
• The interaction and relationship between
magnetism and electricity is known as
electromagnetism.
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
ELECTROMAGNETISM
Creating an Electromagnet
• A magnet can be created by magnetizing a piece of
iron or steel or by using electricity to make an
electromagnet.
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
ELECTROMAGNETISM
Straight Conductor
• The magnetic field
surrounding a straight,
current-carrying conductor
consists of several
concentric cylinders of flux
that are the length of the
wire.
FIGURE 13-6 A magnetic field surrounds a
straight current-carrying conductor.
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
ELECTROMAGNETISM
Left and Right Hand Rules
• Magnetic flux cylinders have direction, just as the flux lines
surrounding a bar magnet have direction.
• The left-hand rule is a simple way to determine this
direction.
• When you grasp a conductor with your left hand so that your
thumb points in the direction of electron flow (- to +) through
the conductor, your fingers curl around the wire in the
direction of the magnetic flux lines.
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
ELECTROMAGNETISM
Left and Right Hand Rules
FIGURE 13-7 The left-hand rule for magnetic field direction
is used with the electron flow theory.
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
ELECTROMAGNETISM
Left and Right Hand Rules
• Most automotive circuits
use the conventional theory
of current (+ to -) and,
therefore, the right-hand
rule is used to determine
the direction of the
magnetic flux lines.
FIGURE 13-8 The right-hand rule for
magnetic field direction is used with the
conventional theory of electron flow.
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
ELECTROMAGNETISM
Field Interaction
• The cylinders of flux surrounding current-carrying
conductors interact with other magnetic fields.
FIGURE 13-9 Conductors with opposing magnetic fields
will move apart into weaker fields.
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
ELECTROMAGNETISM
Motor Principle
• Electric motors, such as automobile starter motors, use this
field interaction to convert electrical energy into mechanical
energy.
FIGURE 13-10 Electric motors use the
interaction of magnetic fields to produce
mechanical energy.
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
ELECTROMAGNETISM
Coil Conductor
• If several loops of wire are made into a coil, then the
magnetic flux density is strengthened.
• Flux lines around a coil are the same as the flux lines around
a bar magnet.
FIGURE 13-11 The magnetic lines of flux
surrounding a coil look similar to those surrounding
a bar magnet.
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
ELECTROMAGNETISM
Coil Conductor
• They exit from the north pole and enter at the south pole.
• Use the left-hand thread rule to determine the north pole of a
coil.
FIGURE 13-12 The left-hand rule for coils is shown.
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
ELECTROMAGNETISM
Electromagnet Strength
• The magnetic field surrounding a current-carrying
conductor can be strengthened (increased) three
ways.
– Place a soft iron core in the center of the coil.
– Increase the number of turns of wire in the coil.
– Increase the current flow through the coil windings.
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
ELECTROMAGNETISM
Electromagnet Strength
• The magnetic field strength
is often expressed in the
units called ampere-turns.
• Coils with an iron core are
called electromagnets.
FIGURE 13-13 An iron core concentrates the
magnetic lines of force surrounding a coil.
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
ELECTROMAGNETISM
Relays
• A relay is a control device
which allows a small
amount of current to control
a large amount of current in
another circuit.
• A simple relay contains an
electromagnetic coil in
series with a battery and a
switch.
FIGURE 13-14 An electromagnetic relay.
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
ELECTROMAGNETISM
Relays
• A contact point, made of a good conductor, is
attached to the free end of the armature.
• Another contact point is fixed a small distance away.
• The two contact points are wired in series with an
electrical load and the battery.
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
ELECTROMAGNETISM
Relays
• When the switch is closed, the following occurs.
– Current travels from the battery through the
electromagnet.
– The magnetic field created by the current attracts the
armature, pulling it down until the contact points meet.
– Closing the contacts allows current in the second circuit
from the battery to the load.
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
ELECTROMAGNETISM
Relays
• When the switch is open, the following occurs.
– The electromagnet loses its current and its magnetic field.
– Spring pressure brings the armature back.
– The second circuit is broken by the opening of the contact
points.
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
ELECTROMAGNETISM
Relays
FIGURE 13-15 In this electromagnetic switch, a light
current (low amperes) produces an electromagnet and
causes the contact points to close. The contact points then
conduct a heavy current (high amperes) to an electrical
unit.
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
ELECTROMAGNETIC INDUCTION
• Magnetic flux lines create an electromotive force, or
voltage, in a conductor if either the flux lines or the
conductor is moving.
• This movement is called relative motion.
• This process is called induction, and the resulting
electromotive force is called induced voltage.
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
ELECTROMAGNETIC INDUCTION
FIGURE 13-16 Voltage can be induced by the relative motion
between a conductor and magnetic lines of force.
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
ELECTROMAGNETIC INDUCTION
Voltage Strength
• Voltage is induced when a conductor cuts across magnetic
flux lines.
• There are four ways to increase induced voltage.
– Increase the strength of the magnetic field, so there are more flux
lines.
– Increase the number of conductors that are breaking the flux lines.
– Increase the speed of the relative motion between the conductor and
the flux lines so that more lines are broken per time unit.
– Increase the angle between the flux lines and the conductor to a
maximum of 90 degrees.
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
ELECTROMAGNETIC INDUCTION
Voltage Strength
FIGURE 13-17 No voltage is induced if the conductor is
moved in the same direction as the magnetic lines of
force (flux lines).
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
ELECTROMAGNETIC INDUCTION
Voltage Strength
FIGURE 13-18 Maximum voltage is induced when
conductors cut across the magnetic lines of force (flux
lines) at a 90 degree angle.
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
ELECTROMAGNETIC INDUCTION
Voltage Strength
• An induced current moves so that its magnetic field
opposes the motion which induced the current.
• This principle is called Lenz’s law.
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
ELECTROMAGNETIC INDUCTION
Self Induction
• When current begins to flow in a coil, the flux lines
expand as the magnetic field forms and
strengthens.
• As current increases, the flux lines continue to
expand, cutting across the wires of the coil and
actually inducing another voltage within the same
coil.
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
ELECTROMAGNETIC INDUCTION
Mutual Induction
• When two coils are close together, energy may be
transferred from one to the other by magnetic
coupling called mutual induction.
• Mutual induction means that the expansion or
collapse of the magnetic field around one coil
induces a voltage in the second coil.
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
ELECTROMAGNETIC INDUCTION
Mutual Induction
FIGURE 13-19 Mutual induction occurs when the expansion or collapse of a
magnetic field around one coil induces a voltage in a second coil.
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
IGNITION COILS
• The heart of any ignition
system is the ignition coil.
• The coil creates a highvoltage spark by
electromagnetic induction.
FIGURE 13-20 Internal construction of an oilcooled ignition coil. Notice that the primary
winding is electrically connected to the
secondary winding. The polarity (positive or
negative) of a coil is determined by the
direction in which the coil is wound.
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
IGNITION COILS
FIGURE 13-21 Typical air-cooled
epoxy-filled E coil.
FIGURE 13-22 Cutaway of a General
Motors Type II distributorless
ignition coil. Note that the primary
windings are inside of the secondary
windings.
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
WHAT IS A “MARRIED”AND “DIVORCED”COIL
DESIGN?
FIGURE 13-23 A tapped (married) type of ignition coil
where the primary winding is tapped (connected) to
the secondary winding.
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
ELECTROMAGNETIC INTERFERENCE
SUPPRESSION
• Until the advent of the onboard computer,
electromagnetic interference (EMI) was not a
source of real concern to automotive engineers.
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
ELECTROMAGNETIC INTERFERENCE
SUPPRESSION
• There are four ways of transmitting EMI, all of which can be
found in a vehicle.
– Conductive coupling is actual physical contact through circuit
conductors.
– Capacitive coupling is the transfer of energy from one circuit to
another through an electrostatic field between two conductors.
– Inductive coupling is the transfer of energy from one circuit to another
as the magnetic fields between two conductors form and collapse.
– Electromagnetic radiation is the transfer of energy by the use of radio
waves from one circuit or component to another.
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
ELECTROMAGNETIC INTERFERENCE SUPPRESSION
EMI Suppression Devices
• There are four general ways in which EMI is reduced.
– By the addition of resistance to conductors, which suppresses
conductive transmission and radiation
– By the use of capacitors and radio choke coil combinations to reduce
capacitive and inductive coupling
– By the use of metal or metalized plastic shielding, which reduces EMI
radiation in addition to capacitive and inductive coupling
– By an increased use of ground straps to reduce conductive
transmission and radiation by bypassing the unwanted signals to
ground
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
ELECTROMAGNETIC INTERFERENCE SUPPRESSION
Suppression Capacitors and Coils
• Capacitors are installed across many circuits and
switching points to absorb voltage fluctuations.
• Among other applications, they are used across the
following:
– The primary circuit of some electronic ignition modules
– The output terminal of most alternators
– The armature circuit of electric motors
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
ELECTROMAGNETIC INTERFERENCE SUPPRESSION
Ground Straps
• Ground or bonding straps between the engine and
chassis of an automobile help suppress EMI
conduction and radiation by providing a lowresistance circuit ground path.
• Such suppression ground straps are often installed
between rubber-mounted components and body
parts.
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
ELECTROMAGNETIC INTERFERENCE SUPPRESSION
Ground Straps
FIGURE 13-24 To help prevent under-hood electromagnetic devices
from interfering with the antenna input, it is important that the hood be
grounded to the body to form one continuous metal covering around the
engine compartment. This is particularly important if the vehicle has a
front fender-mounted antenna. This braided ground strap is standard
equipment on this Dodge Caliber and helps eliminate radio interference.
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
SUMMARY
1. Most automotive electrical components use
magnetism, the strength of which depends on
both the amount of current (amperes) and the
number of turns of wire of each electromagnet.
2. The strength of electromagnets is increased by
using a soft-iron core.
3. Voltage can be induced from one circuit to
another.
4. Electricity creates magnetism and magnetism
creates electricity.
5. Radio-frequency interference (RFI) is a part of
electromagnetic interference (EMI).
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
REVIEW QUESTIONS
1. What is the relationship between electricity and
magnetism?
2. What is the difference between mutual induction
and selfinduction?
3. What is the result if a magnet cracks?
4. How can EMI be reduced or controlled?
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
CHAPTER QUIZ
1.
Technician A says that magnetic lines of force can be seen
by placing iron filings on a piece of paper and then holding
them over a magnet. Technician B says that the effects of
magnetic lines of force can be seen using a compass.
Which technician is correct?
a)
b)
c)
d)
Technician A only
Technician B only
Both Technicians A and B
Neither Technician A nor B
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
CHAPTER QUIZ
1.
Technician A says that magnetic lines of force can be seen
by placing iron filings on a piece of paper and then holding
them over a magnet. Technician B says that the effects of
magnetic lines of force can be seen using a compass.
Which technician is correct?
a)
b)
c)
d)
Technician A only
Technician B only
Both Technicians A and B
Neither Technician A nor B
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
CHAPTER QUIZ
2. Unlike magnetic poles _____ and like magnetic
poles _____.
a)
b)
c)
d)
Repel; attract
Attract; repel
Repel; repel
Attract; attract
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
CHAPTER QUIZ
2. Unlike magnetic poles _____ and like magnetic
poles _____.
a)
b)
c)
d)
Repel; attract
Attract; repel
Repel; repel
Attract; attract
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
CHAPTER QUIZ
3.
The conventional theory for current flow is being used to
determine the direction of magnetic lines of force.
Technician A says that the left-hand rule should be used.
Technician B says that the right-hand rule should be used.
Which technician is correct?
a)
b)
c)
d)
Technician A only
Technician B only
Both Technicians A and B
Neither Technician A nor B
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
CHAPTER QUIZ
3.
The conventional theory for current flow is being used to
determine the direction of magnetic lines of force.
Technician A says that the left-hand rule should be used.
Technician B says that the right-hand rule should be used.
Which technician is correct?
a)
b)
c)
d)
Technician A only
Technician B only
Both Technicians A and B
Neither Technician A nor B
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
CHAPTER QUIZ
4. Technician A says that a relay is an
electromagnetic switch. Technician B says that a
solenoid uses a movable core. Which technician is
correct?
a)
b)
c)
d)
Technician A only
Technician B only
Both Technicians A and B
Neither Technician A nor B
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
CHAPTER QUIZ
4. Technician A says that a relay is an
electromagnetic switch. Technician B says that a
solenoid uses a movable core. Which technician is
correct?
a)
b)
c)
d)
Technician A only
Technician B only
Both Technicians A and B
Neither Technician A nor B
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
CHAPTER QUIZ
5.
Two technicians are discussing electromagnetic induction.
Technician A says that the induced voltage can be
increased if the speed is increased between the conductor
and the magnetic lines of force. Technician B says that the
induced voltage can be increased by increasing the
strength of the magnetic field. Which technician is correct?
a)
b)
c)
d)
Technician A only
Technician B only
Both Technicians A and B
Neither Technician A nor B
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
CHAPTER QUIZ
5.
Two technicians are discussing electromagnetic induction.
Technician A says that the induced voltage can be
increased if the speed is increased between the conductor
and the magnetic lines of force. Technician B says that the
induced voltage can be increased by increasing the
strength of the magnetic field. Which technician is correct?
a)
b)
c)
d)
Technician A only
Technician B only
Both Technicians A and B
Neither Technician A nor B
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
CHAPTER QUIZ
6. An ignition coil operates using the principle of
_____.
a)
b)
c)
d)
Electromagnetic induction
Self-induction
Mutual induction
All of the above
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
CHAPTER QUIZ
6. An ignition coil operates using the principle of
_____.
a)
b)
c)
d)
Electromagnetic induction
Self-induction
Mutual induction
All of the above
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
CHAPTER QUIZ
7. Electromagnetic interference can be reduced by
using a _____.
a)
b)
c)
d)
Resistance
Capacitor
Coil
All of the above
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
CHAPTER QUIZ
7. Electromagnetic interference can be reduced by
using a _____.
a)
b)
c)
d)
Resistance
Capacitor
Coil
All of the above
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
CHAPTER QUIZ
8. An ignition coil is an example of a _____.
a)
b)
c)
d)
Solenoid
Step-down transformer
Step-up transformer
Relay
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
CHAPTER QUIZ
8. An ignition coil is an example of a _____.
a)
b)
c)
d)
Solenoid
Step-down transformer
Step-up transformer
Relay
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
CHAPTER QUIZ
9. Magnetic field strength is measured in _____.
a)
b)
c)
d)
Ampere-turns
Flux
Density
Coil strength
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
CHAPTER QUIZ
9. Magnetic field strength is measured in _____.
a)
b)
c)
d)
Ampere-turns
Flux
Density
Coil strength
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
CHAPTER QUIZ
10. Two technicians are discussing ignition coils. Technician A
says that some ignition coils have the primary and
secondary windings electrically connected. Technician B
says that some coils have totally separate primary and
secondary windings that are not electrically connected.
Which technician is correct?
a)
b)
c)
d)
Technician A only
Technician B only
Both Technicians A and B
Neither Technician A nor B
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
CHAPTER QUIZ
10. Two technicians are discussing ignition coils. Technician A
says that some ignition coils have the primary and
secondary windings electrically connected. Technician B
says that some coils have totally separate primary and
secondary windings that are not electrically connected.
Which technician is correct?
a)
b)
c)
d)
Technician A only
Technician B only
Both Technicians A and B
Neither Technician A nor B
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
END
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458