Which device indicates the total hours the engine has been running?

Which device indicates the total hours the engine has been running?

• A. Hour meter
• B. Engine running time meter
• C. Tachometer
• D. Fuel gauge

Answer: (B)

The key idea is recognizing which instrument tracks actual engine usage time. The engine running time meter records the total hours the engine has been operating, starting when the engine begins running and continuing until it stops. This makes it the best match for indicating cumulative running time, which is important for maintenance and service intervals. A tachometer shows engine speed (RPM), not hours. A fuel gauge shows how much fuel remains. While an hour meter also tracks hours, the term that directly conveys running time aligns most closely with what the question describes.

The key idea is recognizing which instrument tracks actual engine usage time. The engine running time meter records the total hours the engine has been operating, starting when the engine begins running and continuing until it stops. This makes it the best match for indicating cumulative running time, which is important for maintenance and service intervals. A tachometer shows engine speed (RPM), not hours. A fuel gauge shows how much fuel remains. While an hour meter also tracks hours, the term that directly conveys running time aligns most closely with what the question describes.