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A (0-300)V Voltmeter has a guaranteed accuracy of 2% of full scale reading if the voltage measured by this instrument is 180V then the limiting error will be
  • a)
    Less than 2%
  • b)
    Less than 3% but greater than 2%
  • c)
    Less than 4% but greater than 3%
  • d)
    4%
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
A (0-300)V Voltmeter has a guaranteed accuracy of 2% of full scale rea...
                               Error    = 2% of F.S.D.
                                          = 2% of 300 V
                                          = 2/100 x 300 = 6 V
            Measured Value    =     180 V
                               Error   =     6 V
                Absolute error   =    Measured value – True value
                                     6   =    180 - True value
                       Tue Value   =    174 Volt
            Limiting error or % error
                   = 6/174 x 100 =   3.44%
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Most Upvoted Answer
A (0-300)V Voltmeter has a guaranteed accuracy of 2% of full scale rea...
Given information:
- Voltmeter range: 0-300V
- Guaranteed accuracy: 2% of full scale reading
- Voltage measured: 180V

Calculation:
- Full scale reading of the voltmeter: 300V
- 2% of full scale reading: 0.02 x 300 = 6V
- Limiting error = (2% x 180V) + (2% x 6V) = 3.6V + 0.12V = 3.72V

Answer:
- The limiting error will be less than 4% but greater than 3%.
- Option C is the correct answer.

Explanation:
- The guaranteed accuracy of the voltmeter is 2% of the full scale reading, which means that the maximum error can be 2% of the range of the voltmeter.
- In this case, the full scale reading of the voltmeter is 300V, so the maximum error is 2% x 300V = 6V.
- To calculate the limiting error for a specific measurement, we add the maximum error to the percentage of the reading being measured.
- In this case, the voltage measured is 180V, so the percentage of the reading being measured is (180/300) x 100% = 60%.
- The limiting error is therefore (2% x 180V) + (2% x 6V) = 3.6V + 0.12V = 3.72V.
- Therefore, the limiting error will be less than 4% but greater than 3%.
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A (0-300)V Voltmeter has a guaranteed accuracy of 2% of full scale reading if the voltage measured by this instrument is 180V then the limiting error will bea)Less than 2%b)Less than 3% but greater than 2%c)Less than 4% but greater than 3%d)4%Correct answer is option 'C'. Can you explain this answer?
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