Engine TDC & BDC Fundamentals
Test your knowledge about engine piston positions, timing, and the importance of top dead center (TDC) and bottom dead center (BDC) in internal combustion engines.
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Quiz Questions & Answers
Review every prompt, the correct responses, and helpful context to prep for your own run-through.
Question 1: What is Top Dead Center (TDC) in an engine?
The midpoint of piston travel
The lowest point of piston travel
The highest point of piston travel
The point where the valves open
Question 2: During a four-stroke cycle, how many times does the piston reach TDC?
Four times
Twice
Three times
Once
Question 3: What happens to the volume in the combustion chamber when the piston is at TDC?
Volume is half of maximum
Volume remains constant
It reaches minimum volume
It reaches maximum volume
Question 4: What is the relationship between TDC and engine timing marks?
TDC is marked as 90 degrees
TDC is marked as 0 degrees
TDC varies with engine speed
They are unrelated
Question 5: When a piston is at Bottom Dead Center (BDC), what is its position?
At maximum distance from the crankshaft
Halfway through its stroke
At minimum distance from the crankshaft
At a 45-degree angle
Question 6: Which stroke begins when the piston is at TDC?
Intake stroke
Exhaust stroke
Power stroke
Compression stroke
Question 7: What is the significance of finding True TDC when timing an engine?
It's just a reference point
It helps measure fuel economy
It's only needed for diesel engines
It ensures precise timing settings
Question 8: How does piston speed vary between TDC and BDC?
Increases linearly
Varies sinusoidally
Remains constant
Decreases linearly