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ASVAB · Engine Basics and the Four-Stroke Cycle

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

Reviewed by Jordan Morley, Editorial Lead at 247SimpleTests. Written by the 247SimpleTests Editorial Team from the official source material cited on every question.

Correct answer

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

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

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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This question is from our ASVAB Practice Tests practice test. Take the full practice test to test your knowledge across all Engine Basics and the Four-Stroke Cycle and other topics.

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About this topic: Engine Basics and the Four-Stroke Cycle

Engine basics cover the four-stroke cycle (intake, compression, power, exhaust), the parts that make it happen — pistons, valves, crankshaft, camshaft — and the terms used to describe engines, such as displacement and compression ratio. This is one of 21 Auto Information questions on engine basics and the four-stroke cycle, each with a full explanation on a single study page.

New to this exam? Our ASVAB exam guide explains the format, scoring, and how to prepare.

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