Propagation of Error

Q. A 0 - 10 A ammeter has a guaranted accuracy of 1.5% of full scale reading. The current measured by the instrument is 2.5 A. The percentage limiting error in the measurement is $\pm$ ________ %

1. 0.6
2. 6
3. 1.5
4. 3

Q. A voltmeter having reading of 70 V on its 100 V range and an ammeter having reading of 80 mA on its 150 mA range are used to determine power dissipation in a resistor. Both these instruments are guaranteed to be accurate within $\pm 2\%$ at full scale deflection. The limiting error (in percentage) in power measuement is _______

1. 6.6
2. 0.66
3. 2.857
4. 3.75

Q. A (0 - 40)A ammeter has a guaranteed accuracy error of 2% of the full scale reading. If the current measured by this instrument is 10 A, the value of relative limiting error in percentage will be

1. 2%
2. 4%
3. 0.5%
4. 8%