EXAMIANS
The current ‘I’ through a resistance R is measures with the following uncertainties I = 4 A ± 0.5%, R = 100Ω±0.2%. If power is computed from these two measured quantities, the uncertainty in the power computed will be
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A DC potentiometer is the best means available for the measurement of DC voltage because
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The EMF of Weston standard cell is measured using
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For measurement of inductance having high value, we should use
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A voltmeter has 100 scale divisions and can measure up to 100 V. Each division can be read to ½ division. The resolution of the voltmeter is
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A wheatstone bridge cannot be used for precision measurements because errors are introduced into on account of
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A PMMC instrument can be used as flux meter
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The expected value of the voltage across a resistor is 80 V, and the measured value is 79 V. What is the percentage error and relative accuracy of the measurement ?
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A variable w is related to three other variables x, y and z as w = xy/z. The variables are measured with meters of accuracy ± 0.5% reading, ± 1% of full scale value and ± 1.5% reading. The actual readings of the three meters are 80, 20 and 50 with 100 being the full scale value for all three. The maximum uncertainty in the measurement of w will be
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The resistance can be measured most accurately by
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