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ASVAB · General

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

Correct answer

A feeler gauge (gap gauge)

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

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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