ASE Mechanical & Electrical Components 3 — Questions and Answers
Question 1: Excessive crankshaft endplay is typically measured with a:
- Dial indicator (Correct answer)
- Feeler gauge
- Micrometer
- Vacuum gauge
Correct answer: Dial indicator
A dial indicator measures axial crankshaft movement (endplay).
Question 2: A wheel bearing that produces a humming noise that changes when turning the vehicle indicates:
- A worn hub/wheel bearing (Correct answer)
- A bad tie rod
- Low power steering fluid
- A slipping clutch
Correct answer: A worn hub/wheel bearing
Wheel bearing noise commonly changes with cornering load.
Question 3: The purpose of the voltage regulator in the charging system is to:
- Control field current to maintain proper output voltage (Correct answer)
- Rectify AC to DC
- Store electrical energy
- Crank the engine
Correct answer: Control field current to maintain proper output voltage
The regulator adjusts rotor field current to keep system voltage in range.
Question 4: Which measurement tool checks cylinder bore for taper and out-of-round?
- Bore gauge (dial bore gauge) (Correct answer)
- Torque wrench
- Test light
- Tach
Correct answer: Bore gauge (dial bore gauge)
A dial bore gauge measures bore diameter at several points to find taper and out-of-round.
Question 5: A relay's control circuit (coil) typically operates on what compared to the load circuit?
- Low current to switch a high-current load (Correct answer)
- Higher current than the load
- Only AC voltage
- No current at all
Correct answer: Low current to switch a high-current load
A relay uses a small control current to energize a coil that switches a larger load current.
Question 6: Worn valve guides most commonly cause:
- Oil consumption and blue exhaust smoke (Correct answer)
- Coolant in the oil
- A dead battery
- Hard brake pedal
Correct answer: Oil consumption and blue exhaust smoke
Worn guides let oil enter the combustion chamber, causing blue smoke and oil use.
Question 7: When testing a battery with a carbon pile load tester, the load is typically applied at:
- One-half the CCA rating for 15 seconds (Correct answer)
- Twice the CCA for 60 seconds
- Zero load
- Full charging voltage
Correct answer: One-half the CCA rating for 15 seconds
A standard load test applies half the cold cranking amps for about 15 seconds.
ASE Mechanical & Electrical Components 3
Excessive crankshaft endplay is typically measured with a: