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Measurements and Instrumentation - Engineering

Q1:

Consider the following instruments
  1. Tangent galvanometer
  2. Rayleigh current balance
  3. Household energy meter
  4. Hot wire ammeter
Out of above absolute instruments are

A 1, 2 and 3

B 1, 2 and 4

C 1 and 2

D 2, 3 and 4

ANS:C - 1 and 2

Only tangent galvanometer and Rayleigh Current balance are absolute instruments. Energy meter and ammeter are secondary instruments.