ASE A1: Engine Repair Practice Test

24 Questions | By Teturner99 | Last updated: Mar 1, 2018

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ASE Certification A1: Engine Repair

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Questions and Answers

1.

A wet compression test is being performed on a four cylinder engine. The number two cylinder is low and the compression reading stays the same after adding oil. Technician A says the engine needs piston rings. Technician B says the engine has a faulty valve. Who is correct?

Discuss
- A.
  
  Technician A
- B.
  
  Technician B
- C.
  
  Both Technician A and B
- D.
  
  Neither Technician A or B
2.

An engine is making a knocking sound that changes with RPM, and the noise disappears while a cylinder is being tested during the cylinder balance test. Which of the following could be the cause?

Discuss
- A.
  
  Rod bearing
- B.
  
  Main Bearing
- C.
  
  Piston slap
- D.
  
  Burnt valve
3.

A power balance test is being performed. Technician A says to note the engine RPM before and during the test for each cylinder. Technician B says to record the RPM drop for each cylinder. Who is right?

Discuss
- A.
  
  Technician A
- B.
  
  Technician B
- C.
  
  Both Technician A and B
- D.
  
  Neither Technician A or B
4.

7. 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?

Discuss
- A.
  
  Technician A
- B.
  
  Technician B
- C.
  
  Both Technician A and B
- D.
  
  Neither Technician A or B
5.

A vehicle has heavy white smoke emitting from its tailpipe at all engine speeds. The cause of this problem is:

Discuss
- A.
  
  Worn piston rings
- B.
  
  A leaking head gasket
- C.
  
  Worn valve seals
- D.
  
  A leaking fuel injector
6.

The engine coolant's specific gravity (freeze point) can be measured by which tool?

Discuss
- A.
  
  Micrometer
- B.
  
  Thermometer
- C.
  
  Cooling System Pressure Tester
- D.
  
  Hydrometer
7.

Technician A says a supercharger uses an intercooler to keep the engine's oil cool. Technician B says intercoolers are used on turbochargers to keep the oil cool. Who is correct?

Discuss
- A.
  
  Technician A
- B.
  
  Technician B
- C.
  
  Both Technician A and B
- D.
  
  Neither Technician A or B
8.

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?

Discuss
- A.
  
  Technician A
- B.
  
  Technician B
- C.
  
  Both Technician A and B
- D.
  
  Neither Technician A or B
9.

During a cylinder leakage test air bubbles appear coming from the radiator neck. Technician A says this may be caused by a leaking intake valve. Technician B says the engine may have a crack in the engine block. Who is correct?

Discuss
- A.
  
  Technician A
- B.
  
  Technician B
- C.
  
  Both Technician A and B
- D.
  
  Neither Technician A or B
10.

This question is not like the others. It has the word EXCEPT. For this question, look for the choice that could NOT cause the described situation. Read the entire question carefully before choosing your answer. All of the following are reasons why you must disable the fuel injection system and ignition system when conducting an engine compression test, EXCEPT:

Discuss
- A.
  
  Prevents damage to the ignition system during the test
- B.
  
  Prevents fuel injection into the cylinders
- C.
  
  Prevents an engine fire
- D.
  
  Prevents inaccurate readings
11.

An engine has a noise that goes away as the engine warms and reaches operating temperature. Which of these is the most likely cause.

Discuss
- A.
  
  Loose Main bolt
- B.
  
  Loose connecting rod bolt
- C.
  
  Piston to wall clearance
- D.
  
  Loose intake manifold
12.

A vehicle vibrates only when placed in reverse. The most likely cause of this condition is:

Discuss
- A.
  
  Crossed ignition wires
- B.
  
  Faulty fuel injector
- C.
  
  Faulty balance shaft
- D.
  
  Faulty engine mount
13.

A vehicle's cooling system is loosing coolant. There is major corrosion around the aluminum water pump. Which of these are the most likely cause.

Discuss
- A.
  
  Stuck open thermostat
- B.
  
  Electrolysis
- C.
  
  Loose radiator cap
- D.
  
  Faulty head gasket
14.

A power balance test is being performed. Technician A says to note the engine RPM before and during the test for each cylinder. Technician B says to record the RPM drop for each cylinder. Who is right?

Discuss
- A.
  
  Technician A
- B.
  
  Technician B
- C.
  
  Both Technician A and B
- D.
  
  Neither Technician A or B
15.

What engine seal is pictured in the illustration to the right?
- A.
  
  Rear main seal
- B.
  
  Camshaft Plug
- C.
  
  Throttle valve seal
- D.
  
  Valve stem seal
16.

The reading on the micrometer indicates:

Discuss
- A.
  
  6.05mm
- B.
  
  6.00mm
- C.
  
  5.50mm
- D.
  
  6.50mm
17.

During a cylinder leakage test air bubbles appear coming from the radiator neck. Technician A says this may be caused by a leaking intake valve. Technician B says the engine may have a crack in the engine block. Who is correct?

Discuss
- A.
  
  Technician A
- B.
  
  Technician B
- C.
  
  Both Technician A and B
- D.
  
  Neither Technician A or B
18.

Technician A says the ridge must be removed before installing new pistons. Technician B says a ridge reamer is used. Who is correct?

Discuss
- A.
  
  Technician A
- B.
  
  Technician B
- C.
  
  Both Technician A and B
- D.
  
  Neither Technician A or B
19.

A cylinder power balance test is being performed on a vehicle with sequential fuel infection. The #5 cylinders RPM drop is less than all of the others. Technician A says this could be due to a restriction in the fuel injector. Technician B says this could be due to leaking secondary insulation. Who is correct?

Discuss
- A.
  
  Technician A
- B.
  
  Technician B
- C.
  
  Both Technician A and B
- D.
  
  Neither Technician A or B
20.

A compression test is being performed on a vehicle. The #1 cylinder is 30lbs. lower than specifications. The pressure increases after injecting oil into the cylinder. Technician A says that excessive carbon buildup is the cause of this condition. Technician B says the results of this test indicate one of the cylinders valves are defective. Who is correct?

Discuss
- A.
  
  Technician A
- B.
  
  Technician B
- C.
  
  Both Technician A and B
- D.
  
  Neither Technician A or B
21.

The least likely to cause low oil pressure in an engine is:

Discuss
- A.
  
  Faulty oil pressure valve
- B.
  
  Worn crankshaft bearings
- C.
  
  Worn camshaft bearings
- D.
  
  Worn valve guides
22.

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:

Discuss
- 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
23.

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 Technician A and B
- D.
  
  Neither Technician A or B
24.

A vacuum gauge is connected to the intake manifold of an engine. The needle fluctuates between (15 in. Hg and 20 in. Hg) at idle. This reading indicates:

Discuss
- A.
  
  A sticking valve or misfire.
- B.
  
  Late ignition or valve timing.
- C.
  
  A normal condition
- D.
  
  A restricted exhaust system.

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