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Measurement and Instrumentation

Measurement and Instrumentation
Moving iron instruments have _____ scale.

Squared
Uniform
Log
None of the listed here

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Measurement and Instrumentation
For a circuit given that I = 2 ± 5 % A, R = 100 ± 0.2 % Ω the limiting error in the power dissipation I2 R in the resistor R is

 10.2%
 25.2%
 1.2%
 5.2%

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Measurement and Instrumentation
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

 1%
 0.5%
 1.5%
 1.2%

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Measurement and Instrumentation
With a sweep time 10ms across the screen the approx. horizontal sawtooth frequency will be

500Hz
100Hz
50Hz
1kHz

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Measurement and Instrumentation
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

 ± 7%
 ± 8%
 ± 6%
 ± 5%

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Measurement and Instrumentation
A megger is usually

Hot-wire type instrument
Moving coil type instrument
Electro-static type instrument
Moving iron type instrument

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