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ASVAB · General

What does the term 'RPM' measure in an engine?

Correct answer

Revolutions per minute (how fast the engine's crankshaft is turning)

  1. A Fuel level
  2. B Revolutions per minute (how fast the engine's crankshaft is turning)
  3. C Tire pressure
  4. D Oil temperature

Why this is the answer

RPM stands for REVOLUTIONS PER MINUTE — it measures how fast the engine's CRANKSHAFT is turning (engine speed). ASVAB Auto Information tests engine terminology. The TACHOMETER displays RPM. Higher RPM means the engine is working harder/faster; idling is low RPM, and there's a 'redline' maximum RPM to avoid engine damage. RPM relates to the transmission gear selection (shifting keeps RPM in an efficient range). Knowing that RPM measures engine/crankshaft rotational speed is commonly tested.
Source: ASVAB Auto Information — Engine Speed (RPM)

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