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ASE A1 practice test, Quizzes of Engineering

Clemson UniversityEngineering

This is an ASE practice test with answers at the end.

Typology: Quizzes

2024/2025

Uploaded on 07/15/2025

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ASE A1 Engine Repair Practice Test
1. A vehicle has heavy white smoke emitting from its tailpipe at all engine speeds.
The cause of this problem is:
A. Worn piston rings.
B. A leaking head gasket.
C. Worn valve seals.
D. A leaking fuel injector.
2. A vacuum gauge is connected to a port on the intake manifold of an engine
with poor performance. The needle on the gauge fluctuates between 15 "hg and
20 "hg vacuum at idle. This vacuum gauge reading indicates:
A. A normal condition.
B. Late ignition or valve timing.
C. A sticking valve or misfire.
D. A restricted exhaust system.
3. Technician A says an engine's main bearing insert has a hole that must align
with the matching bores oil supply hole. Technician B says that crankshaft bore
alignment can be checked with a feeler gauge and a straightedge. Who is correct?
A. Technician A
B. Technician B
C. Both A and B
D. Neither A or B
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ASE A1 Engine Repair Practice Test

  1. A vehicle has heavy white smoke emitting from its tailpipe at all engine speeds. The cause of this problem is: A. Worn piston rings. B. A leaking head gasket. C. Worn valve seals. D. A leaking fuel injector.
  2. A vacuum gauge is connected to a port on the intake manifold of an engine with poor performance. The needle on the gauge fluctuates between 15 "hg and 20 "hg vacuum at idle. This vacuum gauge reading indicates: A. A normal condition. B. Late ignition or valve timing. C. A sticking valve or misfire. D. A restricted exhaust system.
  3. Technician A says an engine's main bearing insert has a hole that must align with the matching bores oil supply hole. Technician B says that crankshaft bore alignment can be checked with a feeler gauge and a straightedge. Who is correct? A. Technician A B. Technician B C. Both A and B D. Neither A or B
  1. A cylinder power balance test is being performed on a vehicle with sequential fuel injection. Two adjacent cylinders are under performing. Technician A says this could be due to a faulty head gasket. Technician B says this could be due to leaking secondary insulation. Who is correct? A. Technician A B. Technician B C. Both A and B D. Neither A or B
  2. Two technicians are discussing hydraulic lifter preload. Technician A says excessive preload will cause high manifold vacuum. Technician B says insufficient preload will cause excessive valve train noise. Who is correct? A. Technician A B. Technician B C. Both A and B D. Neither A or B
  3. Technician A says the valves in many interference engines open further into the combustion chamber that than those of a non-interference engine. Technician B says a broken timing belt in an interference engine can result in damage to the engine's valve train. Who is correct? A. Technician A B. Technician B C. Both A and B D. Neither A or B
  1. A vehicle has a clogged catalytic converter. The LEAST likely cause of this is: A. A rich fuel condition. B. A leaking fuel injector. C. A cracked intake manifold. D. A fouled spark plug.
  2. After diagnosing and replacing the cooling system's water pump, the vehicle's engine continues to overheat. Which of these is the MOST likely cause. A. An air pocket in the system. B. Leaking head gasket. C. Faulty replacement water pump. D. The radiator.
  3. Two technicians are discussing engine sealants and form in place gaskets. Technician A says sealants such as RTV are aerobic. Technician B says some sensors may be damaged if an unapproved sealant is used. Who is correct? A. Technician A B. Technician B C. Both A and B D. Neither A or B
  1. An engine has a noise that goes away as the engine warms and reaches operating temperature. Which of these is the MOST likely cause. A. Loose main bolt. B. Loose connecting rod bolt. C. Piston to wall clearance. D. Loose intake manifold.
  2. An engine suffers from detonation. Technician A this may be caused from a defective EGR valve. Technician B says advanced ignition timing can cause this condition. Who is correct? A. Technician A B. Technician B C. Both A and B D. Neither A or B
  3. Technician A says faulty turbocharger bearings will result in a loss of engine oil. Technician B says a dirty turbocharger air filter will result in a loss of engine oil. Who is correct? A. Technician A B. Technician B C. Both A and B D. Neither A or B
  1. Two technicians are discussing cylinder bore measurements. Technician A says the cylinder's bore should be measured for out of round. Technician B says the cylinder's bore should be measured and checked for taper. Who is correct? A. Technician A B. Technician B C. Both A and B D. Neither A or B
  2. Technician A says that connecting rods and the rod caps are matched and can not be mixed. Technician B says it may be necessary to mark these parts for reassembly. Who is correct? A. Technician A B. Technician B C. Both A and B D. Neither A or B
  3. Engine crack repair is being discussed. Technician A says metal pinning is an accepted method of cracked cylinder head repair. Technician B says metal pinning is an accepted method of cracked engine block repair. Who is correct? A. Technician A B. Technician B C. Both A and B D. Neither A or B
  1. Which of these is LEAST likely to cause low oil pressure in an engine. A. A faulty oil pressure valve. B. A worn crankshaft bearings. C. A worn camshaft bearings. D. A worn valve guides.
  2. Technician A says valve spring installed height is measured from the outer edge of the valve spring retainer to the pocket in the cylinder head. Technician B says that too thin of a valve margin will not effect its operating temperature. Who is correct? A. Technician A B. Technician B C. Both A and B D. Neither A or B
  3. Technician A says that magnetic particle detection is an acceptable method to detect cracks in aluminum castings. Technician B says a special dye is used to detect cracks in aluminum castings. Who is correct? A. Technician A B. Technician B C. Both A and B D. Neither A or B
  1. The top compression ring groove of piston is worn excessively and the gap is found to be larger than specifications. The technician would MOST likely: A. Use a tapered ring set to repair this piston. B. Use oversized rings to repair this piston. C. Use a ring groove cleaner to repair the grooves. D. Replace the piston.
  2. A strong sulfur smell is coming from the tailpipe of a vehicle. The MOST likely cause of this condition is: A. A lean fuel condition. B. Leaking head gasket. C. Worn piston rings. D. A rich fuel condition.
  3. A technician performs a battery capacity test on a vehicle that will not start. The test results in a reading of 9.1 volts at 70° F. Technician A says the battery has failed the capacity test. Technician B says battery voltage readings will increase as temperature decreases. Who is correct? A. Technician A B. Technician B C. Both A and B D. Neither A or B
  1. After performing a cylinder pressure test on a four cylinder engine. The # cylinder is found to be 30 psi below specifications. All the other cylinders have passed. The pressure in the #1 cylinder increased after injecting engine oil. Technician A says excessive carbon buildup has caused of these test results. Technician B says these results indicate a faulty engine valve. Who is correct? A. Technician A B. Technician B C. Both A and B D. Neither A or B
  2. One valve tip on a cylinder head is much higher than the others. The MOST likely cause of this is: A. Weak spring tension. B. Valve spring installed height. C. The valve face. D. Loose head bolts.
  3. Two technicians are discussing a ballooned oil filter. WhIch of these is causing this condition: A. Contaminated oil. B. Stuck closed oil pressure relief valve. C. Stuck closed oil filter bypass valve. D. All of the above.
  1. A technician installs a radiator pressure tester on the radiator of a cold engine. After starting the engine the pressure quickly rises to 18 psi. Technician A says this is a normal condition. Technician B says the engine has a leaking cylinder head gasket. Who is correct? A. Technician A B. Technician B C. Both A and B D. Neither A or B
  2. Two Technicians are discussing a PCV system. Technician A says a stuck closed PCV valve could cause external oil leaks. Technician B says that the PCV system removes blowby gases from the engine case. Who is correct? A. Technician A B. Technician B C. Both A and B D. Neither A or B
  3. An OHC engine has recently had the cylinder head replaced. The engine runs rough and stumbles. Technician A says this may be caused by incorrect valve lash adjustment. Technician B says that only in-block camshafts require valve lash adjustments. Who is correct? A. Technician A B. Technician B C. Both A and B D. Neither A or B
  1. Technician A says worn valve springs result in valve float at wide open throttle. Technician B says valve springs should be inspected for squareness with a square and a feeler gauge. Who is correct? A. Technician A B. Technician B C. Both A and B D. Neither A or B
  2. A wet compression test is being performed on a four cylinder engine. The number two cylinder's compression is below specifications and remains the same after injecting oil. This result indicates: A. Worn piston rings. B. A faulty valve. C. A hole in the piston. D. Excessive carbon buildup on the piston's dome.
  3. A metallic knocking sound is heard behind an engine's harmonic balancer. An oil pressure test indicates oil pressure is below specifications. Technician A says the engine's main bearing inserts should be inspected for wear. Technician B says a worn thin crankshaft thrust bearing will cause this condition. Who is correct? A. Technician A B. Technician B C. Both A and B D. Neither A or B

The reading on the micrometer indicates: A. 6.05 mm B. 6.00 mm C. 5.50 mm D. 6.50 mm

  1. A technician is checking for piston ring groove clearance. The proper technique includes. A. The old ring and a feeler gauge. B. The new ring and a feeler gauge. C. Only a feeler gauge. D. No feeler gauge is required.
  2. A cylinder power balance test is being performed on a vehicle with sequential fuel injection. The number five cylinder's rpm drop is less than all of the others. Technician A says this could be the result of a restriction in the fuel injector. Technician B says this could be caused by leaking secondary insulation. Who is correct? A. Technician A B. Technician B C. Both A and B D. Neither A or B
  3. Two technicians are discussing a turbocharged engine. Technician A says the wastegate is a component used to control boost pressure. Technician B says when opened, the wastegate diverts exhaust gas from the turbine wheel. Who is correct? A. Technician A B. Technician B C. Both A and B D. Neither A or B

Answers

  1. B
  2. C
  3. C
  4. C
  5. B
  6. C
  7. D
  8. C
  9. B 10.C 11.A 12.C 13.C 14.C 15.A 16.D 17.B 18.D 19.C 20.C 21.C 22.D 23.A 24.B 25.C 26.A 27.C 28.D 29.D 30.A 31.D 32.C 33.D

34.D

35.C

36.B

37.B

38.C

39.A

40.C

41.B

42.C

43.C

44.D

45.B

46.D

47.B

48.C

49.C

50.D