Question

Which instrument is used to measure the speed of a rotating machine?

Answer 1

TACHOMETER

A tachometer (revolution-counter, tach, rev-counter, RPM gauge) is an instrument measuring the rotation speed of a shaft or disk, as in a motor or other machine. The device usually displays the revolutions per minute (RPM) on a calibrated analogue dial, but digital displays are increasingly common.

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Answer 2

Hey !!!

- Instrument used to measure. the speed of a rotating machine is called $\huge{\fbox{\textbf{TACHOMETER}}}$.

- It is used to measure the angular speed(or rotating speed) of a thing like disk.

- It generally measures the Revolutions Per Minute.(RPM).

Thus it is also called as RPM Gauge.

- There are many types of Tachometers available:

Mechanical, Electrical, Hand-held etc.

- Calibrated Analogue dials are used to indicate the RPM. Most commonly, Digital dials are also being used.