Ignition Systems 2

The primary circuit in an ignition system is considered to be:

high voltage

low voltage

medium voltage

voltage cannot be measured

Correct! Wrong!

The secondary circuit in an ignition system is considered to be:

high voltage

low voltage

medium voltage

voltage cannot be measured

Correct! Wrong!

Technician A says that the opening of the points in an ignition circuit causes the magnetic field surrounding the primary windings in the coil to collapse. Technician B says that the collapse of this magnetic field induces a high voltage in the secondary windings. Who is correct?

Technician A

Technician B

both A and B

neither A and B

Correct! Wrong!

Arcing of the ignition points is caused by a spike of induced voltage in the primary windings. To reduce this arcing a ______________ is used.

resistor

diode

transformer

condenser

Correct! Wrong!

Which of the following symptoms may indicate a faulty ignition coil?

the engine will not start

the engine is hard to start

the engine misfires

all of the above

Correct! Wrong!

On negative ground systems, the negative terminal on the coil is connected to the:

distributor

ignition switch

ballast resistor

battery

Correct! Wrong!

When testing ignition coil resistance, a high resistance value for a good coil would be found on the:

primary

secondary

positive side

negative side

Correct! Wrong!

Cam angle (dwell) refers to the length of time in degrees that the:

points are closed

points are open

points are open and closed

none of the above

Correct! Wrong!

The combustion power that opposes the upward travel of the piston resulting in a knocking or pinging sound is often caused by:

late ignition timing

early ignition timing

cold weather starting

all of the above

Correct! Wrong!

The term "heat range" refers to the spark plug''s ability to transfer the heat at the firing tip to the cooling system of the engine. The heat range of a spark plug is determined by:

the overall length of the plug

the size of the gap

the distance the heat must travel

all of the above

Correct! Wrong!

The distributor rotor directs the high voltage from the coil to the:

spark plug to be fired

points

condenser

ballast resistor

Correct! Wrong!

A worn rubbing block on a set of points will cause the points to:

stay closed longer

retard timing

increase the dwell

all of the above

Correct! Wrong!

The mechanism located in the distributor that is used to alter ignition timing as engine speed changes is known as;

dwell

centrifugal advance

the rotor

the condenser

Correct! Wrong!

On electronic ignition systems the reluctor, pick-up sensor and ignition control unit replace the and__.

distributor cap and rotor

points and coil

condenser and coil

points and condenser

Correct! Wrong!

The advantage(s) of electronic ignition systems is (are):

longer spark plug life

a hotter spark

a spark with a longer duration

all of the above

Correct! Wrong!

To adjust the dwell on an electronic ignition system you would:

rotate the reluctor on the drive shaft

rotate the sensor on the drive shaft

rotate the sensor on the base plate

the dwell cannot be manually adjusted

Correct! Wrong!

Upon inspection a technician finds a spark plug that is sooty, black in color with signs of normal wear. This would be an indication of:

normal appearance

excessive fuel

combustion too hot

wrong polarity

Correct! Wrong!

Upon inspection a technician finds a spark plug that is tan or light brown in color with signs of center electrode wear and increase gap. This would be an indication of:

normal appearance

excessive fuel

combustion too hot

wrong polarity

Correct! Wrong!

Upon inspection a technician finds a spark plug that has a dished ground tang but little electrode wear. This would be an indication of:

normal appearance

excessive fuel

combustion too hot

wrong coil polarity

Correct! Wrong!

Technician A says that when a ballast resistor is used in the primary circuit it will heat up at slow engine speeds and reduce the current flow. Technician B says that the ballast resistor will cool down a t high engine speeds and increase current flow. Who is correct?

Technician A

Technician B

both A and B

neither A nor B

Correct! Wrong!

The reluctor assist in generating an electrical current in an electronic ignition system that triggers the ___________ to interrupt the circuit of the primary coil.

condenser

module

rotor

centrifugal advance

Correct! Wrong!

Ignition coils create high secondary voltage through self-induction.

True

False

Correct! Wrong!

The bypass circuit in an ignition system reduces supply voltage to the coil when in the start position for better starting.

True

False

Correct! Wrong!

To set initial timing on a distributor type ignition, turning the distributor housing opposite rotor rotation would ____________engine timing.

advance

retard

Correct! Wrong!

The ignition coil is part of both primary and secondary circuits.

True

False

Correct! Wrong!

Dual point ignition system are used to:

extend point life

on dual ignition systems

increase dwell

decrease dwell

Correct! Wrong!

The pick-up coil in a distributor:

is influenced by the reluctor.

signals the module

actuates a current flow to induce a voltage in a coil

all of the above

Correct! Wrong!

High secondary voltage is produced when:

current flow to the coil is turned on

current flow to the coil is turned off

there is a constant power supply to the coil

current flow from the coil flows through the ballast resistor

Correct! Wrong!

If point dwell is reduced, the coil voltage build up time would:

increase

decrease

not be affected

erratic

Correct! Wrong!

One of these statements is incorrect. Select the one incorrect answer:

A coil from a points and condenser system or an electronic ignition system are fully interchangeable with one another. If you can make them fit, they will work just fine

a condenser or a capacitor is used to help increase the speed of the collapsed of the coil''s magnetic field in both the points and condenser style ignition and the electronic ignition system

many coils are manufactured with a type of oil installed that could be very dangerous to your health

almost all of the original ignition coils worked on six volts. Only with the advent of high energy ignition systems that coils were designed for twelve volts and were actually transformers

Correct! Wrong!

The voltage level required by the secondary circuit to fire the spark plug may be determined by:

spark plug gap

distributor rotor gap

condition of high tension wires

all of the above

Correct! Wrong!

If the time required to reach the full force of combustion after the spark occurs is .003 of a second, as the engine RPM increases, the spark must be:

retarded

advance

kept the same

weakened

Correct! Wrong!

What type of tool is most commonly used when checking the resistances or primary voltages of an ignition coil?

OEM specific scan tool

digital multimeter (DMM)

an oscilloscope

test light

Correct! Wrong!

When adjusting timing settings on an engine equipped with a distributor and a vacuum advance unit. Technician A says that when checking the mechanical advance in a distributor, disconnect the vacuum hose, block it off and accelerate the engine to check the degrees of advance. Technician B says that to check the total advance, you leave the vacuum advance connected, accelerate the engine and read the degrees of advance. Who is right?

Technician A

Technician B

both Technician A and B

neither A nor B

Correct! Wrong!

Which of the following would LEAST likely cause an engine misfire?

intake manifold leak

exhaust manifold leak

defective spark plugs

defective coil

Correct! Wrong!

What should the mechanical advance unit be inspected for?

to ensure that it moves when vacuum is applied

cracks in the diaphragm

brittle vacuum supply hose

broken or missing counterweight springs

Correct! Wrong!

While measuring the resistance of a spark plug wire, a reading of 10,000 ohms is obtained. What does this indicate to the technician?

a good spark plug wire

a faulty spark plug wire

the wrong scale on the ohmmeter was selected

the wrong type spark plug was used

Correct! Wrong!

When a battery is disconnected from the electrical systems in a vehicle with several on-board computers and modules, this procedure may cause:

damage to all the computers

the non-volatile memory to erase

the adaptive memory to be erased

voltage surges in the electrical system

Correct! Wrong!

The throttle position sensor assembly on most electronically controlled engines contains:

poterntiometer

cruise control controller switch

accellerometer

vehicle speed limiting

Correct! Wrong!

Electronic controlled diesel engine ECM operates on a reference voltage of 12 volts, plus or minus 5 volts:

True

False

Correct! Wrong!

At anyone particular speed, the output signal of a Hall Effect sensor that would be received by an ECM would be read as a ________________ signal:

AC voltage

DC voltage

digital on-off

analog variable

Correct! Wrong!

A gasoline engine''s knock sensor may be:

a potentiometer

rheostat

a grounding switch

piezio-electric Chrystal

Correct! Wrong!

One factor that allows accurate vehicle operation, is that the computer is constantly changing the ignition timing and fuel delivery to account for changes in vehicle operation.

True

False

Correct! Wrong!

The oxygen sensor monitors:

only the exhaust air/fuel ratio

exhaust air/fuel ratio and spark timing

spark timing only

all of the engine operation

Correct! Wrong!

Before disconnecting the battery on a computer controlled vehicle, you should:

scan and retrieve any trouble codes

take the vehicle for a thorough test drive

reset the clock

check all the computer connections

Correct! Wrong!

Using leaded fuel in a computer controlled fuel injected vehicle will likely damage the catalytic convertor and the:

air injection system

exhaust gas recirculation valve

oxygen sensor

the intake valves

Correct! Wrong!

One indication that there is definitely a problem with the computerized operational system of a vehicle is when:

the check engine light is on

there are fuel mileage complaints from the driver

there are no visible exhaust fumes from the exhaust pipe

there are visible exhaust fumes from the exhaust pipe

Correct! Wrong!

Once a code has been retrieved from the computer memory, the next logical step would be:

replace the sensor or actuator that the code refers to

re-wine the area that is indicated as a problem

consult the service manual for appropriate pinpoint tests

wait until the problem occurs again

Correct! Wrong!

A good scanner diagnostic system for vehicle computer systems is: 1) capable of monitoring a specific system. 2) watch for possible malfunctions and then. 3) play-back the entire occurrence so that you can see what happened before and after.

True

False

Correct! Wrong!

Some computers system have removable and re-programmable memories or calibration assemblies that can be replaced.

True

Correct! Wrong!

The primary circuit in an ignition system is considered to be:

The secondary circuit in an ignition system is considered to be:

Technician A says that the opening of the points in an ignition circuit causes the magnetic field surrounding the primary windings in the coil to collapse. Technician B says that the collapse of this magnetic field induces a high voltage in the secondary windings. Who is correct?

Arcing of the ignition points is caused by a spike of induced voltage in the primary windings. To reduce this arcing a ______________ is used.

Which of the following symptoms may indicate a faulty ignition coil?

On negative ground systems, the negative terminal on the coil is connected to the:

When testing ignition coil resistance, a high resistance value for a good coil would be found on the:

Cam angle (dwell) refers to the length of time in degrees that the:

The combustion power that opposes the upward travel of the piston resulting in a knocking or pinging sound is often caused by:

The term "heat range" refers to the spark plug''s ability to transfer the heat at the firing tip to the cooling system of the engine. The heat range of a spark plug is determined by:

The distributor rotor directs the high voltage from the coil to the:

A worn rubbing block on a set of points will cause the points to:

The mechanism located in the distributor that is used to alter ignition timing as engine speed changes is known as;

On electronic ignition systems the reluctor, pick-up sensor and ignition control unit replace the ____________and______________.

The advantage(s) of electronic ignition systems is (are):

To adjust the dwell on an electronic ignition system you would:

Upon inspection a technician finds a spark plug that is sooty, black in color with signs of normal wear. This would be an indication of:

Upon inspection a technician finds a spark plug that is tan or light brown in color with signs of center electrode wear and increase gap. This would be an indication of:

Upon inspection a technician finds a spark plug that has a dished ground tang but little electrode wear. This would be an indication of:

Technician A says that when a ballast resistor is used in the primary circuit it will heat up at slow engine speeds and reduce the current flow. Technician B says that the ballast resistor will cool down a t high engine speeds and increase current flow. Who is correct?

The reluctor assist in generating an electrical current in an electronic ignition system that triggers the ___________ to interrupt the circuit of the primary coil.

Ignition coils create high secondary voltage through self-induction.

The bypass circuit in an ignition system reduces supply voltage to the coil when in the start position for better starting.

To set initial timing on a distributor type ignition, turning the distributor housing opposite rotor rotation would ____________engine timing.

The ignition coil is part of both primary and secondary circuits.

Dual point ignition system are used to:

The pick-up coil in a distributor:

High secondary voltage is produced when:

If point dwell is reduced, the coil voltage build up time would:

One of these statements is incorrect. Select the one incorrect answer:

The voltage level required by the secondary circuit to fire the spark plug may be determined by:

If the time required to reach the full force of combustion after the spark occurs is .003 of a second, as the engine RPM increases, the spark must be:

What type of tool is most commonly used when checking the resistances or primary voltages of an ignition coil?

Which of the following would LEAST likely cause an engine misfire?

What should the mechanical advance unit be inspected for?

While measuring the resistance of a spark plug wire, a reading of 10,000 ohms is obtained. What does this indicate to the technician?

When a battery is disconnected from the electrical systems in a vehicle with several on-board computers and modules, this procedure may cause:

The throttle position sensor assembly on most electronically controlled engines contains:

Electronic controlled diesel engine ECM operates on a reference voltage of 12 volts, plus or minus 5 volts:

At anyone particular speed, the output signal of a Hall Effect sensor that would be received by an ECM would be read as a ________________ signal:

A gasoline engine''s knock sensor may be:

One factor that allows accurate vehicle operation, is that the computer is constantly changing the ignition timing and fuel delivery to account for changes in vehicle operation.

The oxygen sensor monitors:

Before disconnecting the battery on a computer controlled vehicle, you should:

Using leaded fuel in a computer controlled fuel injected vehicle will likely damage the catalytic convertor and the:

One indication that there is definitely a problem with the computerized operational system of a vehicle is when:

Once a code has been retrieved from the computer memory, the next logical step would be:

A good scanner diagnostic system for vehicle computer systems is: 1) capable of monitoring a specific system. 2) watch for possible malfunctions and then. 3) play-back the entire occurrence so that you can see what happened before and after.

Some computers system have removable and re-programmable memories or calibration assemblies that can be replaced.

Success!

Heavy-Duty Mechanic - Trucks & Equipment

On electronic ignition systems the reluctor, pick-up sensor and ignition control unit replace the and__.