10 exam-style questions with answers and explanations, straight from our 1,055-question bank. Tap an answer to check yourself. When you're ready, take the scored version in the free practice test.
The A1 exam has 55 questions and runs 1 hour 15 minutes.
These 10 free A1 questions are organized by exam domain, so you can see how each part of the Automobile & Light Truck Certification - A1 Engine Repair blueprint is tested. Reveal the answer and explanation under each question.
A cranking compression test on a four-cylinder engine produces the following readings: cylinder 1 - 155 psi, cylinder 2 - 88 psi, cylinder 3 - 90 psi, cylinder 4 - 158 psi. Adding oil to cylinders 2 and 3 does not change their readings. The MOST likely cause is:
Correct answer: D - A head gasket leaking between cylinders 2 and 3
A cylinder leakage (leak-down) test is being performed. Technician A says air escaping from the tailpipe indicates a leaking exhaust valve. Technician B says air escaping from the oil fill tube indicates a leaking intake valve. Who is correct?
Correct answer: A - Technician A only
Cranking compression measures 150 psi on all cylinders. With the engine running, a snap-throttle running compression test produces 140 psi on all cylinders. This MOST likely indicates:
Correct answer: A - A restricted exhaust system
A vacuum gauge is connected to the intake manifold of an engine that idles with a slight miss. The needle drops sharply and regularly by about 5 in-Hg, then returns to its original reading. This MOST likely indicates:
Correct answer: C - A burned or leaking valve
A knocking noise is heard when the engine is running in DRIVE with the brakes applied, but the noise is not present in PARK or NEUTRAL. The MOST likely cause is:
Correct answer: B - A cracked flexplate
A customer reports a light tapping noise that lasts about three seconds after every cold start and then disappears completely. Oil level, oil viscosity, and oil pressure are all within specification. The MOST likely cause is:
Correct answer: D - A failed oil filter anti-drainback valve
A high-mileage engine emits blue smoke from the tailpipe when decelerating from highway speed, but produces no visible smoke during hard acceleration. The MOST likely cause is:
Correct answer: A - Worn valve guides and stem seals
A cranking compression test on a six-cylinder engine produces readings between 95 and 105 psi on every cylinder. The vehicle runs and drives with no performance complaint. Which action should the technician take FIRST?
Correct answer: C - Verify battery state of charge and cranking speed
A cylinder head requires both valve guide service and valve seat cutting. Technician A says the seats should be cut first so the guides can then be sized to match the finished seats. Technician B says the guides must be serviced first because the guide pilots the seat cutter. Who is correct?
Correct answer: B - Technician B only
Valve lash on a mechanical (solid) lifter engine is adjusted tighter than specification. This will MOST likely result in:
Correct answer: B - A burned valve and low compression in that cylinder
The A1 exam also covers these domains. Drill them in the full free practice test:
The full bank has 1,045 more A1 questions with explanations.
Continue in the free practice test →
View plans