Electrical Systems
Which specific gravity reading taken at 20 degrees Celsius would indicate that a lead acid battery was fully charged?
1.265
When an automotive engine is run without a thermostat, which of the following conditions would be most likely to result?
Higher HC and CO emissions
An exhaust manifold is cracked. What type of signal would an oxygen sensor feed to the ECM?
Lean fuel condition
Which of the following would produce an overdrive in a simple planetary gear set?
Input sun gear, hold carrier, output ring gear
What tool should be used to check disc brake rotor runout?
Dial indicator
Which of the following should be true when jump-starting a car with a dead battery with another vehicle?
The last connection should be ground on the dead vehicle
What happens to a Plastigage strip when friction-bearing clearance decreases?
It becomes wider
Which of the following actions would remove the data logged into a NV-RAM (non-volatile, random access memory) chip?
Disconnecting the vehicle battery
When an automatic transaxle dipstick is wiped on a clean wiper, there is evidence of dark particles. Which of the following would be the most likely cause?
Wear debris from clutches and bands
Which of the following conditions would be most likely to cause brake fade in a drum brake system?
Repeated braking during a long downhill gradient
A starter motor will not crank and the vehicle headlamps dim when the ignition circuit is energized. Which of the following should be checked for first?
Discharged battery
What must be done if the crankshaft end play exceeds specification?
Replace the trust bearing
What would remedy a complain that a spark plug was running hot?
Plug with a shorter ceramic insulator
During a 5-second stall test on an automatic transaxle, the engine rpm rises above the manufacturer’s specification. Which of the following is indicated?
Transmission problem
Which of the following would be a correct method of depressurizing an ABS system prior to servicing a brake caliber assembly?
Depress brake pedal 40 times with the engine off
When checking starter current draw with an inductive ammeter clamp, which of the following should be done?
Crank the engine
A V6 engine with a zirconium dioxide-type oxygen sensor has 1 defective spark plug. Which of the following conditions would be most likely to result?
Over-fuelling of all cylinders and overheating
When testing an ignition coil with a 3-light logic probe, what is indicated when the yellow light illuminates?
Voltage is changing
When a manual clutch is disengaged on a stationary vehicle with the engine running at idle, which of the following should be true?
The clutch friction disc is stationary
In a heavy-duty vehicle air brake system using double chamber spring brakes, what force is used to actuate the emergency brakes?
Spring pressure
If an ohmmeter reads infinity between any 2 of the stator winding leads, which of the following would be true?
The stator is open and defective
Which of the following best describes what happens when the armature of a gasoline fuel injector is energized when an engine is running?
Fuel is injected
What is the manufacturer-preferred method of removing a thin layer of carbon buildup on an oxygen sensor?
Run the engine lean for 2 minutes to heat the sensor
A differential is noisy on both right and left turns but is otherwise quiet. Which of the following conditions should be checked out first?
Worn differential pinion gears
Which type of wheel balance provides the most precision and for this reason would be used on high-performance applications?
On-the-car spin balancer