Question: A wattmeter has a full scale range of 2500 W. it has an error of ±1% of true value. What would be the range of reading if true power is 1250 W ?
Answer:
MCQ: A wattmeter has a full scale range of 2500 W. it has an error of ±1% of true value. What would be the range of reading if true power is 1250 W ?
Correct Answer:
A. 1225 W – 1275 W
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Related Questions
- 1. Power in d.c circuit is measured by measuring the voltage across and current through the circuit.The voltage and current measurements are made to an accuracy of ±2% and ±3% respectively. The errors are limiting errors. The error in measurement of power is:
- 2. The power in a circuit is measured by measuring a current through a resistor. The current is measured with an accuracy of ±1.5% and the tolerance band of resistor ±0.5%. the errors are limiting or guarantee errors. The accuracy with which power is measured is :
- 3. In an permanent magnet moving coil ammeter the deflection of the pointer is proportional to product of flux density of magnetic field produced by the permanent magnet and current in the moving coil. if the strength of permanent magnet becomes 95% of the original, The meter gives erroneous reading resulting into error. This error can be classified as:
- 4. The voltage of circuit is measured by a voltmeter having an input impedance comparable with the output impedance of the circuit thereby causing error in voltage measurement. This error may be called
- 5. The mean Deviation D in terms of deviation from the mean value of <em>n</em> reading is
- 6. A set of readings has a wide range and therefore it has:
- 7. The Gaussian distribution can be mathematically expressed as:
- 8. for a Gaussian distribution, the probable error is <em>r. </em>This means that:
- 9. Two resistances 100Ω ± 5Ω and 150Ω ± 15Ω are connected in series. If the deviations are standard deviations, the resultant resistance can be expressed as:
- 10. if the result of a measurement is expressed as x̅ ± 3σ where x̅ = mean value and σ = standard deviation ,it means that :
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