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Measurement and Instrumentation

Measurement and Instrumentation
A 10MHz CRO has

10MHz horizontal oscillator
5MHz sweep
10MHz vertical oscillator
10MHz supply frequency

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Measurement and Instrumentation
A set of independent current measurements taken by four observers was recorded as : 117.02 mA, 117.11 mA, 117.08 mA and 117.03 mA. What is the range of error ?

 ± 0.045
 ± 0.054
 ± 0.065
 ± 0.056

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Measurement and Instrumentation
The total current I = I1 + I2 in a circuit is measured as I1 = 150 ± 1A , I2 = 250 ± 2A, where the limits of error are as standard deviations. I is measured as

 (400 ± 3) A
 (400 ± 2.24) A
 (400 ± 1) A
 (400 ± 1.5) A

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Measurement and Instrumentation
For measurement of high direct voltage, one would use _____ voltmeter.

Electrostatic
Moving iron
PMMC
Hot wire

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Measurement and Instrumentation
Alternating current is measured by

Permanent magnet type ammeter
Moving iron repulsion type voltmeter
Induction ammeter
Electrostatic ammeter

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Measurement and Instrumentation
The smallest change in measured variable to which instrument will respond is

 accuracy.
 precision.
  resolution.
 sensitivity.

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