Ignition & Fuel: Chapter 26 Quiz
Which of the following is not a type of electronic ignition system? a) DI (distributor ignition) b) MAF (mass airflow) c) DLI (distributorless ignition) d) DI (direct ignition)
a) DI (distributor ignition)
TRUE OR FALSE: A camshaft position sensor (CMP) is necessary for a waste spark type ignition system to determine which coil to fire when the engine reaches TDC.
FALSE
TRUE OR FALSE: Conventional ignition systems are capable of producing higher electrical energy than distributorless ignition systems.
FALSE
TRUE OR FALSE: Driving on a rough road can trigger the engine misfire monitor.
FALSE
TRUE OR FALSE: Magnetic pulse generators produce a weak DC voltage when the teeth of the trigger wheel rotate past the pickup coil.
FALSE
TRUE OR FALSE: Most distributor-equipped ignition systems use one ignition coil for each cylinder.
FALSE
TRUE OR FALSE: On a coil-over-plug type ignition system, a faulty coil will affect two cylinders.
FALSE
TRUE OR FALSE: Until 1994 all ignition systems used some type of distributor.
FALSE
TRUE OR FALSE: A late model ignition system can supply 30,000 to 60,000 volts of electricity.
TRUE
TRUE OR FALSE: A spark plug fires before the piston reaches top dead center (TDC).
TRUE
TRUE OR FALSE: A spark plug's ceramic core or insulator acts as a heat conductor.
TRUE
TRUE OR FALSE: Driving on a rough road can trigger the engine misfire monitor.
TRUE
TRUE OR FALSE: Many of the inputs used for ignition system control are also used to control other systems,such as fuel injection.
TRUE
TRUE OR FALSE: The distributorless ignition system of a V-6 engine may be designed with three ignition coils.
TRUE
TRUE OR FALSE: The misfire monitor uses a high data rate CKP [crankshaft position] sensor to detect engine misfires, and the CMP [camshaft position] sensor is used to identify which cylinder is misfiring.
TRUE
TRUE OR FALSE: The waste-spark ignition system on a four cylinder engine with dual plug [two spark plugs per cylinder] cylinder heads requires four ignition coils.
TRUE
Coil-over-plug ignition systems are being discussed, Technician A says COP coils have less time between each firing cycle, which increases the heat in the coil and can cause premature failure. Technician B says the COP system allows the ignition timing for each cylinder to be individually changed for maximum performance as the system responds to knock sensor signals. Who is correct? a) A only b) B only c) both A and B d) neither A nor B
b) B only
Computer-controlled ignition timing is being discussed. Technician A says when excessive wheel slippage occurs, the PCM will advance the timing to increase the torque output from the engine. Technician B says to provide smooth shifting of an automatic transmission, the PCM will temporarily retard the ignition timing to reduce the engine's torque when the transmission is beginning to change gears. a) A only b) B only c) both A and B d) neither A nor B
b) B only
Crankshaft sensors are being discussed. Technician A says the signal from a Hall-effect CKP cannot be used to synchronize fuel injector timing with the engine. Technician B says some early distributor ignition systems relied on photoelectric sensors to monitor crankshaft position. Who is correct? a) A only b) B only c) both A and B d) neither A nor B
b) B only
Spark plug design is being discussed. Technician A says a plug with too short a reach makes it difficult to attach the plug wire boot. Technician B says a plug with too long a reach may cause preignition. Who is correct? a) A only b) B only c) both A and B d) neither A nor B
b) B only
Technician A says a plug with a V-notch ground electrode will have two electric arcs jumping across the spark plug gap each time the spark plug fires. Technician B says a spark plug gap that is too wide requires higher voltage to jump the gap, which can cause a misfire. Who is correct? a)A only b) B only c) both A and B d) neither A nor B
b) B only
Which of the following components is part of both the primary and secondary ignition circuits? a) spark plugs b) ignition coil c) battery d) ignition switch
b) ignition coil
The magnetic field surrounding the pickup coil in a magnetic pulse generator moves when the ______. a) reluctor tooth approaches the ignition coil b) reluctor tooth begins to move away from the pickup coil c) reluctor tooth begins to move away from the ignition coil d) the pickup coil is midway between two reluctor teeth
b) reluctor tooth begins to move away from the pickup coil
Modern ignition cables contain carbon fiber cores that act as a(n) ____ in the secondary circuit to cut down on radio and television interference and reduce spark plug wear. a) insulator b) resistor c) semiconductor d) heat shield
b) resistor
The typical amount of secondary coil voltage required to jump the spark plug gap is ____ volts. a) 500 b) 1,000 c) 10,000 d) 50,000
c) 10,000
What happens when the low-voltage current flow in the coil primary winding is interrupted by the switching device? a) The magnetic field around the primary winding collapses b) The movement of the magnetic field across the winding induces a high voltage in the secondary winding c) Both A and B d) Neither A nor B
c) Both A and B
The heat range of a spark plug is indicated by ______ on the spark plug. a) the color of the insulator ribs b) the number of insulator ribs c) a code within the plug number printed d) All the answers are correct.
c) a code within the plug number printed
Ignition coils are being discussed. Technician A says the primary coil is normally composed of 100 to 200 turns of 20-gauge wire. Technician B says the secondary coil consists of 15,000 to 25,000, or more, turns of very fine copper wire. Who is correct? a) A only b) B only c) both A and B d) neither A nor B
c) both A and B
Ignition timing is being discussed. Technician A says when the engine idle speed moves away from the desired idle speed, the PCM will adjust the timing to stabilize the engine speed. Technician B says when a knock is detected, the PCM retards the timing in fixed steps until the knock disappears. Who is correct? a) A only b) B only c) both A and B d) neither A nor B
c) both A and B
In EI systems using one ignition coil for every two cylinders, Technician A says two plugs fire at the same time, with one wasting the spark on the exhaust stroke. Technician B says one plug fires in the normal direction and the other in reversed polarity. Who is correct? a) A only b) B only c) both A and B d) neither A nor B
c) both A and B
Resistor-type spark plugs are being discussed. Technician A says the resistor increases the plug firing voltage. Technician B says the resistor helps reduce radio frequency interference (RFI), which can interfere with, or damage, radios, computers, and other electronic accessories, such as GPS systems. Who is correct? a) A only b) B only c) both A and B d) neither A nor B
c) both A and B
Technician A says a magnetic pulse generator type sensor generates a small AC voltageeach time one of the machined slots in the trigger wheel passes by. Technician B says some ignition systems use dual Hall-effect sensors that produce a 3x and 18x/revolution pulse. Who is correct? a) A only b) B only c) both A and B d) neither A nor B
c) both A and B
Two technicians are discussing waste spark type ignition systems. Technician A says that half of the spark plugs in the system fire in reversed polarity [from the ground electrode to the center electrode]. Technician B says that the two spark plugs are connected in series with the coil. Who is correct? a) A only b) B only c) both A and B d) neither A nor B
c) both A and B
While discussing electronic ignition systems, Technician A says an NPN transistor in the PCM or ignition module controls primary current flow through the coil. Technician B says coil saturation is controlled by the length of time the primary ignition current is turned on. Who is correct? a) A only b) B only c) both A and B d) neither A nor B
c) both A and B
Which of the following components is part of the primary ignition circuit? a) spark plug b) spark plug cable c) ignition switch d) neutral safety switch
c) ignition switch
Reach, heat range, and air gap are all characteristics that affect the performance of which ignition system component? a) ignition coils b) ignition cables c) spark plugs d) breaker points
c) spark plugs
What is an advantage of EI ignition? a) There are no moving parts, and therefore it requires little maintenance b) It is possible to control the ignition of individual cylinders to meet specific needs c) Mechanical timing adjustments are eliminated d) All the answers are correct.
d) All the answers are correct
All the following elements except _____ are used in the spark plug center electrode to increase plug life. a) platinum b) iridium c) yttrium d) cesium
d) cesium
EI systems are being discussed. Technician A says a waste spark system has one coil per cylinder. Technician B says a coil-on-plug system uses a double-ended coil. Who is correct? a) A only b) B only c) both A and B d) neither A nor B
d) neither A nor B
Resistor plugs are being discussed. Technician A says that if the original equipment resistor plugs are replaced with nonresistor plugs, the engine will produce more power at high RPM. Technician B says that if the original equipment resistor plugs are replaced with nonresistor plugs, the engine will run smoother at low RPM. Who is correct? a) A only b) B only c) both A and B d) neither A nor B
d) neither A nor B
Technician A says spark plugs are part of the primary ignition circuit. Technician B says the battery is part of the secondary ignition circuit. Who is correct? a) A only b) B only c) both A and B d) neither A nor B
d) neither A nor B
Which of the following is NOT a type of engine position sensor? a) Hall-effect b) magnetic pulse generator c) photoelectric (optical) d) piezoresistive
d) piezoresistive
Which of the following is a component of the secondary ignition circuit? a) battery b) ignition switch c) PCM d) spark plug
d) spark plug
One of the advantages of a coil-on-plug type ignition system is that it eliminates the need for ______. a) crankshaft position sensor (CKP) b) camshaft position sensor (CMP) c) knock sensor (KS) d) spark plug wires
d) spark plug wires