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ASVAB · Engine Basics and the Four-Stroke Cycle

Which tool is specifically designed to measure the gap of a spark plug?

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

A feeler gauge (gap gauge)

  1. A A screwdriver
  2. B A torque wrench
  3. C A feeler gauge (gap gauge)
  4. D A socket wrench

Why this is the answer

A FEELER GAUGE (or spark plug gap gauge) is used to measure the GAP of a spark plug (the small space between the center and ground electrodes). ASVAB Auto Information (overlapping with Shop) tests tool knowledge. The correct gap is important for proper spark and engine performance. A TORQUE WRENCH measures/applies a specific tightening force; a SOCKET WRENCH turns nuts/bolts. Feeler gauges (thin metal blades of precise thicknesses) measure small gaps and clearances. Knowing the feeler/gap gauge measures spark plug gaps is commonly tested.
Source: ASVAB Auto Information — Tools, Gap Gauge

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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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