Question

A tachometer is a device to measure:
A. Gravitational pull
B. Speed of rotation
C. Surface tension
D. Tension in a spring

Answer 1

Hint: Technically the first tachometer was based on measuring the centrifugal force, the working of the tachometer is similar to the centrifugal governor. The founder of this instrument is used for the measuring of the speed.

Complete step by step answer:
The tachometer is the word that originated from a Greek word known as Tachometer. Tachos means speed and meter means to measure. These instruments are available as hand-held or molds that are in a fixed amount. They use a light source spinning wheel to make measurements.
The tachometers or revolution counters on cars, aircraft, or other vehicles show the rate of rotation of the crankshaft of the engine, and they typically have the markings that indicate a safe range of the rotation of the speeds. This device will assist the driver in selecting the appropriate throttle and settings of the gear for the driving conditions.
When we take on the analog tachometers, the maximum speeds above the safety of the operating speeds are typically indicated by the areas of the gauge marked in red, which gave rise to the redlining of an engine that while reviving the engine that have the maximum safety limits.
The tachometer in the older vehicles was driven by the rms waves of the voltage from the low-tension side of the ignition coil while in others the speed of the engine is determined by the frequency from the tachometer output.
Therefore, from the name of the tachometer itself, we can understand that it is the instrument that is used to measure the speed of the rotation.

So, the correct answer is “Option A”.

Note:
Tachometers are designed basically to measure the shaft or disc that is rotating while the machine is in motion. Essentially there is a difference between the tachometers and speedometers. The speedometer is the instrument that is used to measure the speed of the vehicles and it is combined with the other device called an odometer.