Question

An instrument used to measure working speed of an engine is called ________

• A. Voltmeter
• B. Multimeter
• C. Hydrometer
• D. Tachometer

Hint:

A tachometer measures the RPM (revolutions per minute) of an engine or other rotat ing machinery.

Answer 1

The Correct Option is D

A tachometer measures engine working speed or rotational speed, typically in revolutions per minute (RPM). It monitors speed in engines and mechanical systems for proper performance. Therefore, the correct answer is "Tachometer."