Ignition Systems

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 nor 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!

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!

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!

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 increased 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 at 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 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 combination after the spark occurs is .003 of a second, as the engine RPM increases, the spark must be:

retarded.

advanced.

kept the same.

weakened.

Correct! Wrong!

The reluctor assists 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!

The pick-up coil in a distributor:

is influenced by the reluctor.

signals the module.

creates an induced voltage in a coil.

all of the above.

Correct! Wrong!

High secondary voltage is produced when:

power to the coil is turned on.

power to the coil is turned off.

there is a constant power supply to the coil.

power flow to the coil flows through the ballast resistor.

Correct! Wrong!

An ignition system that is sensitive to moisture could be caused by all of the following EXCEPT:

a cracked distributor cap.

deteriorated ignition wires.

a cracked ignition coil tower.

loose distributor mounting.

Correct! Wrong!

If certain spark plugs fire regularly and others do not and the secondary circuit is suspected to be the cause, which of the following could be the cause?

Ignition switch.

Hall effect switch.

Ignition coil.

Spark plug wires.

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!

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!

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 collapse 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!

A spark plug insulator is ribbed to aid in:

installation and removal.

reducing flashover.

heat dissipation.

moisture sealing.

Correct! Wrong!

The primary function of the inertia switch is to control power to the _____________ in the event of an accident.

fuel pump.

engine.

ECM.

ignition.

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!

Dual point ignition systems are used to:

extend point life.

on dual ignition systems.

increase dwell.

decrease dwell.

Correct! Wrong!

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

increase.

decrease.

not be affected.

erratic.

Correct! Wrong!

You cannot troubleshoot point type ignition systems without the use of a scope.

True.

False.

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!

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.

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:

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):

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 increased 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 at high engine speeds and increase current flow. Who is correct?

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 combination after the spark occurs is .003 of a second, as the engine RPM increases, the spark must be:

The reluctor assists 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.

The pick-up coil in a distributor:

High secondary voltage is produced when:

An ignition system that is sensitive to moisture could be caused by all of the following EXCEPT:

If certain spark plugs fire regularly and others do not and the secondary circuit is suspected to be the cause, which of the following could be the cause?

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

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

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

A spark plug insulator is ribbed to aid in:

The primary function of the inertia switch is to control power to the _____________ in the event of an accident.

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

Dual point ignition systems are used to:

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

You cannot troubleshoot point type ignition systems without the use of a scope.

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?

Success!

Heavy-Duty Mechanic - Trucks & Equipment

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