IFLE12.doc

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1. Technician A says that the coil-on-plug (COP) system eliminates the spark plug wires that are often the source of electromagnetic interference, which can cause problems for some computer signals. Technician B says that the three-wire COP system used by GM has an ICM built into the coil assembly. Who is correct?
A. Technician A
B. Technician B
C. Both Technicians A and B
D. Neither Technician A nor B2. What can be used to measure the alcohol content in gasoline?
A. Electronic tester
B. Graduated cylinder
C. Either a graduated cylinder or an electronic tester
D. Scan tool3. Which of these alcohols is often called wood alcohol because it was once produced chiefly as a by-product of the destructive distillation of wood?
A. Isopropyl
B. Ethanol
C. Gasohol
D. Methanol4. Two technicians are describing engine operation and requirements at high altitude. Technician A says that when traveling at high altitudes, the engine produces more power. Technician B says that at high altitudes the octane rating of fuel doesn’t need to be as high because the engine can’t take in as much air. Who is correct?
A. Technician A
B. Both Technicians A and B
C. Technician B
D. Neither Technician A nor B5. Which of these least accurately describes what happens when abnormal combustion raises the temperature and pressure inside the combustion chamber?
A. Ping
B. Vapor lock
C. Detonation
D. Spark knock6. When checking for a no-start concern, you notice that an engine has no spark. Technician A says to turn on the ignition (engine off) and, using a DMM, find out how much battery voltage is available at the negative terminal of the ignition coil. Technician B says the DMM reading should fluctuate, indicating that the primary coil current is being turned on and off. Who is correct?
A. Technician B
B. Technician A
C. Both Technicians A and B
D. Neither Technician A nor B7. Which of these is a lean condition caused by vaporized fuel in the fuel system?
A. Hydra-lock
B. Lean fuel trim (LFT)
C. Lean burn
D. Vapor lock8. Even though the content of many alcohol blends doesn’t affect engine drivability, using gasoline with alcohol in warm weather may cause
A. fuel to enter the expansion area of the tank
B. warm-engine stumble, stalling, or rough idle.
C. a decrease in fuel economy.
D. ground spills.
9. The electronics in the ignition coil and the powertrain control module in a compression-sensing ignition system can detect which of the two companion (paired) cylinders require higher voltage, which indicates the cylinder that’s
A. at zero degrees TDC (top dead center).
B. at zero degrees BDC (bottom dead center).
C. on the power stroke.
D. on the compression stroke.
11. Two technicians are discussing the waste-spark system. Technician A says that it fires one cylinder while its piston is on the compression stroke and into paired or companion cylinders while it’s on the exhaust stroke. Technician B says that waste-spark ignitions require a sensor (usually a crankshaft sensor) to trigger the coils at the correct time. Who is correct?
A. Technician A
B. Both Technicians A and B
C. Technician B
D. Neither Technician A nor B
All of these are parts of the primary ignition circuit except
A. the ignition switch.
B. spark plug wiring.
C. the ignition module.
D. pickup coil.
Diesel engines manufactured to 2007 standards or newer must use ultra-low-sulfur diesel fuel containing less than _______ of sulfur.
A. 500 PPM
B. 1,500 PPM
C. 15 PPM
D. 50 PPM
Pure ethanol has an octane rating of about 113. E85, which contains 35 percent oxygen by weight, has an octane rating of about
A. 110–115.
B. 90–95.
C. 100–105.
D. 98–100.
Propane also known as LP gas, is often mixed with about _______ percent of other gases, such as butane, propylene, and mercaptan.
A. 30
B. 10
C. 20
D. 5
Cloud point is the low-temperature point at which the waxes present in most diesel fuels tend to form crystals that can clog the
A. fuel filter.
B. fuel injector.
C. injection pump.
D. lift pump.