Correct Answer - Option 2 : 1.8%
Guaranteed accuracy in percentage = 1 % of full-scale reading
Full scale reading = 150 V
Guaranteed accuracy error in volts \(= 150 \times \frac{1}{{100}} = 1.5\;V\)
So, while measuring 83 V on (0-150) V voltmeter, it may read (83 ± 1.5) V.
Limiting error \(= \frac{{1.5}}{{83}} \times 100 = 1.8\;\% \)