Automotive theory, Chapter 35 & 36
Which of the following components is part of both the primary and secondary ignition circuits?
Ignition coil
Total circuit resistance is higher than the leg with the lowest total resistance
It will always be lower
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?
B
While discussing EI systems: Technician A says that all systems rely on CKP and CMP signals to synchronize the ignition system with piston movement. Technician B says that CKP and CMP signals are used to synchronize the operation of the ignition and fuel injection systems with piston position. Who is correct?
B
While discussing EI systems: Technician A says that when the engine is being cranked, the PCM relies only on the signals from the ECT to determine initial ignition timing. Technician B says that when an engine is initially started and is running at a predetermined speed, the PCM looks at several inputs, including engine speed, load, throttle position, and engine coolant temperature, and makes adjustments accordingly. Who is correct?
B
While discussing central port injection (CPI), Technician A says the poppet nozzles are opened by the computer. Technician B says the poppet nozzles are opened by fuel pressure. Who is correct?
B
Technician A says that an oxygen sensor can be a voltage-producing sensor. Technician B says that an oxygen sensor is a thermistor sensor. Who is correct?
A
While discussing tailpipe emissions and cylinder misfiring: Technician A says that cylinder misfiring causes a significant increase in HC emissions. Technician B says that cylinder misfiring results in a large in-crease in CO emissions. Who is correct?
A
What is an advantage of EI ignition? a) There are no moving parts, and therefore it requires little 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.
All answers are correct
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?
Both A & B
While discussing controllers in BEVs: Technician A says the controller may reverse the current flow to the motor when the reverse gear is selected. Technician B says modern controllers adjust motor speed through pulse width modulation. Who is correct?
Both A & B
While discussing ignition systems: Technician A says that an ignition system must supply high-voltage surges to the spark plugs. Technician B says that the system must maintain the spark long enough to burn all of the air-fuel mixture in the cylinder. Who is correct?
Both A & B
All the following are variable resistors EXCEPT: A) potentiometer B) resistor wire C) rheostat D) thermistor
resistor wire