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?
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?
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.
Share your Results: