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in present day measurement systems
Measurement by direct methods are not always possible, feasible and practicable. In most of the cases direct method of measurements are inaccurate because they involve human factors. Moreover, they are less sensitive. Due to these reasons use of direct method of measurement is limited while indirect methods are commonly used
The use of electronic instruments is becoming more extensive because they have
A thermometer is calibrated 150°C to 200°C. The accuracy is specified within ±0.25 percent of instrument span. The maximum static error is
A set of independent current measurements were recorded as 10.03, 10.10, 10.08 and 10.11 A, The average range of error is
Average value of current is
Two resistors R_{1}, and R_{2} are connected in series with R_{1} = 28.7 Ω and R_{2} = 3.624 Ω. The total resistance to the appropriate number of significant figures can be written as
For series connection,
Since one of the resistance (i.e. R_{1}) is accurate only to three significant figures, therefore the result of R _{total} has to be reduced to three significant figures. Hence, total resistance
A Wheatstone bridge requires a change of 8 a in the unknown arm of the bridge to produce a change in deflection of 3 mm of the galvanometer. The deflection factor (scale factor) is
A moving coil voltmeter has a uniform scale with 100 divisions, the full scale reading is 200 V and 1/10 of a scale division can be estimated with a fair degree of certainty.The resolution of the instrument in volt is
A multimeter having a sensitivity of 2 kΩ/V is used for the measurement of voltage across a circuit having an output resistance of 10 kΩ. The open circuit voltage of the circuit is 6 volts. The percentage error in multimeter reading when it is set to 10 volt is given by
The circuit diagram for the measurement of voltage using multimeter is shown below:
A 50 V range voltmeter is connected across the terminals X and Y of the circuit shown in figure below. The voltage across the terminals are measured both under open circuit and loaded conditions.
The accuracy in the measurement of voltage across the terminals X and Y in percent is
The given circuit can be reduced to its Thevenin’s equivalent circuit as shown below.
True value of voltage across terminals XY is
Measured value of voltage across terminals XY is
The number of significant figures in the two resistors having resistances 4 x 10^{6} kΩ and 0.345 kΩ are respectively
22 docs274 tests

22 docs274 tests
