Which statement about the Visible Smoke Test is true?

• A. The test evaluates the exhaust for visible smoke.
• B. The test evaluates fuel pressure.
• C. The test measures radiator temperature.
• D. The test checks brake wear.

Answer: (A)

Visible Smoke Test checks the exhaust visually as the engine runs to see if smoke is present, which signals combustion problems or improper fuel burning. That’s why the statement that it evaluates the exhaust for visible smoke is the correct one. The test isn’t about fuel pressure, radiator temperature, or brake wear—those are separate inspections and not part of the visible smoke check. Smoke color can give clues (black for too rich, blue for oil burning, white for coolant or moisture), but the test’s purpose is simply to determine whether visible smoke is present.