Question

An ammeter has a range of 0 to 30 A. The instrument gave the following readings.
$\begin{array}{ccccccc}\text{Current flow (A)}& 0& 5& 10& 15& 20& 25\\ \text{Ammeter reading}& 1& 4& 12& 14& 22& 28\end{array}$

The non-linearity of the instrument in terms of full scale reading (FSR) is ........ % FSR.

• A. 10

Answer 1

The correct option is A 10
$\text{Non-linearity}=\frac{\text{Maximum deviation}}{F.S.R.}$

$\%N.L.=\frac{28-25}{30}\times 100=10\%$