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Measurements and Instrumentation - Engineering

Q1:

Consider the following features of an instrument
  1. suitable for both ac and dc
  2. free from hysteresis and eddy current errors
  3. No waveform and frequency errors
  4. it is essentially a voltmeter
This instrument is

A moving iron

B moving coil

C electrostatic

D dynamometer

ANS:C - electrostatic

Only electrostatic instrument has all these features.