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Answer :

It is a device used to measure the speed of a rotating shaft. It usually gives speed in RPM.
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Description : What is tachometer ? Explain photo electric pick-up

Answer : Tachometer is an instrument which is used to measure angular speed. It is measured in revolutions per minutes (RPM). Working: Working principle:The light passes through the holes available on the rotating disc with ... is given by  N=f/HS  N=speed  f=frequency  Hs=holes on the disc 

Description : what is tachometer?

Answer : It is also known ad tachogenerator,it is used to measure angular speed in rpm

Description : An a.c. tachometer is just a ________with one phase excited from the carrier frequency. (A) two-phase A.C. servomotor (B) two-phase induction motor (C) A.C. operated universal motor (D) hybrid stepper motor.

Answer : Ans: D This is a special purpose machine whose stator coil can be energized by electronically switched current.

Description : A tachometer is a device used to measure (1) gravitational pull (2) speed of rotation (3) surface tension (4) dispersive power

Answer :  speed of rotation

Description : State the use of Lux Meter and Tachometer in energy audit.

Answer : Use of lux meter – to measure intensity of light Use of tachometer – to measure speed