ASE Short Answer 2

Question 1

What component converts the rotating motion of the crankshaft into the up-and-down motion needed to open and close engine valves?

Accepted Answer

Camshaft

Answer

The camshaft lobes push the valve train to open and close valves in time with the crankshaft.

Question 2

A vehicle's brake pedal slowly sinks to the floor under steady pressure with no external leak. What is the most likely cause?

Accepted Answer

Failing master cylinder internal seal

Answer

A pedal that sinks with no visible leak usually means the master cylinder seals are bypassing internally.

Question 3

Which gas does a properly functioning catalytic converter help reduce by converting it into nitrogen and oxygen?

Accepted Answer

Oxides of nitrogen (NOx)

Answer

The reduction catalyst breaks NOx down into harmless nitrogen and oxygen.

Question 4

What is the correct term for the angle that, when viewed from the front, describes the inward or outward tilt of the top of the tire?

Accepted Answer

Camber

Answer

Camber is the inward (negative) or outward (positive) tilt of the wheel viewed from the front.

Question 5

An engine cranks but will not start, and there is no spark or fuel injector pulse. Which sensor failure is the most likely common cause?

Accepted Answer

Crankshaft position sensor

Answer

The PCM uses the crankshaft position sensor signal to fire both spark and injectors, so a failure kills both.

ASE Practice Test