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Measurements and Instrumentation - Engineering

Q1:

Consider the following operation in respect of Wheatstone bridge (Kb, denotes battery key, Kg denotes galvanometer key)
  1. open Kb
  2. close Kg
  3. close Kb
  4. open Kg
The correct sequence of operations is

A 1, 2, 3, 4

B 3, 1, 2, 4

C 4, 3, 2, 1

D 3, 2, 4, 1

ANS:D - 3, 2, 4, 1

Battery key must be closed before galvanometer key. Moreover galvanometer key must be opened before battery key. This is to avoid damage to galvanometer.