Short Answer Flashcards
7 cards from real ASE practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Short Answer flashcards as text
What component converts the rotating motion of the crankshaft into the up-and-down motion needed to open and close engine valves?
Answer: Camshaft
The camshaft lobes push the valve train to open and close valves in time with the crankshaft.
A vehicle's brake pedal slowly sinks to the floor under steady pressure with no external leak. What is the most likely cause?
Answer: Failing master cylinder internal seal
A pedal that sinks with no visible leak usually means the master cylinder seals are bypassing internally.
Which gas does a properly functioning catalytic converter help reduce by converting it into nitrogen and oxygen?
Answer: Oxides of nitrogen (NOx)
The reduction catalyst breaks NOx down into harmless nitrogen and oxygen.
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?
Answer: Camber
Camber is the inward (negative) or outward (positive) tilt of the wheel viewed from the front.
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?
Answer: Crankshaft position sensor
The PCM uses the crankshaft position sensor signal to fire both spark and injectors, so a failure kills both.
What does the abbreviation 'DTC' stand for in automotive diagnostics?
Answer: Diagnostic Trouble Code
A DTC is the Diagnostic Trouble Code stored by the onboard computer when a fault is detected.
When measuring battery state of charge, what open-circuit voltage typically indicates a fully charged 12-volt automotive battery?
Answer: About 12.6 volts
A fully charged 12-volt battery at rest reads about 12.6 volts.