Question 1

Oil consumption problems are being discussed. Technician A says a lack of regular services can cause the oil control rings to plug. Technician B says worn compression rings can cause oil consumption problems. Who is correct?

Accepted Answer

A) Technician A 
B) Technician B 
C) Both technicians 
D) Neither technician

Question 2

An engine exhibits a low, steady vacuum reading. This could indicate _____.

Accepted Answer

A) a stuck valve 
B) an improper ignition timing 
C) plugged exhaust 
D) bad compression rings

Question 3

If an engine will not turn over in either direction, it could be due to a broken crankshaft.

Accepted Answer

A) True 
 B)False

Question 4

Technician A says that vacuum readings for an engine with a performance camshaft might be lower at idle. Technician B says that an engine that has worn lower main bearings will have lower oil pressure at freeway speeds. Who is right?

Accepted Answer

A) Technician A only 
B) Technician B only 
C) Both A and B 
D) Neither A nor B

Question 5

Excessive clearance at a connecting rod bearing journal will cause a rod knock.

Accepted Answer

A) True 
 B)False

Question 6

What happens to the outside of an exhaust pipe at the point of an internal restriction?

Accepted Answer

The answer of What happens to the outside of an...

Question 7

Engine operation is being discussed. Technician A says preignition can cause engine damage. Technician B says carbon deposits on the pistons can increase the compression ratio. Who is correct?

Accepted Answer

A) Technician A 
B) Technician B 
C) Both technicians 
D) Neither technician

Question 8

A noise occurs at 1⁄2 crankshaft rpm. Technician A says that this could be a bad lifter. Technician B says that this could be a valve that needs to be adjusted. Who is right?

Accepted Answer

A) Technician A only 
B) Technician B only 
C) Both A and B 
D) Neither A nor B

Question 9

What other engine part failure sometimes results in a cracked piston?

Accepted Answer

The answer of What other engine part failure sometimes results...

Question 10

Technician A says that a cylinder leakage test is better than a compression test for testing the Condition of an engine before installing it in a car. Technician B says that a compression tester is better than a cylinder leakage tester for testing the condition of an engine with a performance camshaft. Who is right?

Accepted Answer

A) Technician A only 
B) Technician B only 
C) Both A and B 
D) Neither A nor B

Question 11

A roar will be heard through the engine's air intake when the _____ system is restricted.

Accepted Answer

The answer of A roar will be heard through the...

Question 12

During a compression test, a cylinder shows lower readings than expected. Technician A squirts a tablespoon of oil into the cylinder and the compression raises. He says this indicates a problem with the rings. Technician B says a running compression test should be about one-quarter of that of a cranking compression test. Which technician is correct?

Accepted Answer

A) Technician A 
B) Technician B 
C) Both technicians 
D) Neither technician

Question 13

Highway driving can result in extra fuel and water dilution in the oil.

Accepted Answer

A) True 
 B)False

Question 14

Vacuum readings will drop approximately 1 inch for each _____ feet above sea level.

Accepted Answer

The answer of Vacuum readings will drop approximately 1 inch...

Question 15

An engine has late valve timing. Technician A says that this will cause poor low rpm performance. Technician B says that at higher rpm, engine performance might be acceptable. Who is right?

Accepted Answer

A) Technician A only 
B) Technician B only 
C) Both A and B 
D) Neither A nor B

Question 16

Comparing premium fuel to regular fuel, the burn time of premium fuel is _____.

Accepted Answer

A) significantly shorter 
B) only slightly shorter 
C) longer 
D) nearly the same

Question 17

Two technicians are discussing compression test results. Technician A says that abnormally low compression in adjacent (neighboring) cylinders most likely indicates a bad head gasket. Technician B says that if the reading on the compression tester goes up after adding oil to the cylinder, the compression rings are probably worn. Who is right?

Accepted Answer

A) Technician A only 
B) Technician B only 
C) Both A and B 
D) Neither A nor B

Question 18

A rich air-fuel mixture could cause a catalytic converter to overheat and melt.

Accepted Answer

A) True 
 B)False

Question 19

When a spark plug is disabled and the noise becomes louder, what could this be?

Accepted Answer

The answer of When a spark plug is disabled and...

Question 20

An infrared analyzer can be used to check the radiator for combustion leaks.

Accepted Answer

A) True 
 B)False

Exam 3: Diagnosing Engine Problems

Oil consumption problems are being discussed. Technician A says a lack of regular services can cause the oil control rings to plug. Technician B says worn compression rings can cause oil consumption problems. Who is correct?

An engine exhibits a low, steady vacuum reading. This could indicate _____.

If an engine will not turn over in either direction, it could be due to a broken crankshaft.

Technician A says that vacuum readings for an engine with a performance camshaft might be lower at idle. Technician B says that an engine that has worn lower main bearings will have lower oil pressure at freeway speeds. Who is right?

Excessive clearance at a connecting rod bearing journal will cause a rod knock.

What happens to the outside of an exhaust pipe at the point of an internal restriction?

Engine operation is being discussed. Technician A says preignition can cause engine damage. Technician B says carbon deposits on the pistons can increase the compression ratio. Who is correct?

A noise occurs at 1⁄2 crankshaft rpm. Technician A says that this could be a bad lifter. Technician B says that this could be a valve that needs to be adjusted. Who is right?

What other engine part failure sometimes results in a cracked piston?

A roar will be heard through the engine's air intake when the _____ system is restricted.

Highway driving can result in extra fuel and water dilution in the oil.

Vacuum readings will drop approximately 1 inch for each _____ feet above sea level.

An engine has late valve timing. Technician A says that this will cause poor low rpm performance. Technician B says that at higher rpm, engine performance might be acceptable. Who is right?

Comparing premium fuel to regular fuel, the burn time of premium fuel is _____.

A rich air-fuel mixture could cause a catalytic converter to overheat and melt.

When a spark plug is disabled and the noise becomes louder, what could this be?

An infrared analyzer can be used to check the radiator for combustion leaks.