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Measurement and Instrumentation

Measurement and Instrumentation
To measure high frequency currents, we mostly use ______ ammeter.

Thermocouple
Hot wire
Moving iron
Dynamometer

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Measurement and Instrumentation
A 0 - 200 V voltmeter has a guaranteed accuracy of 1% of full scale reading. The voltage measured by this instrument is 50 V. What is the limiting error?

 5%
 2%
 3%
 4%

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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

 ± 8%
 ± 7%
 ± 6%
 ± 5%

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Measurement and Instrumentation
The total current I = I1 + I2 in a circuit is measured I1 = 150 ± 3A , I2 = 250 ± 4 A, where the limits of error are given as standard deviations. I is measured as

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

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Measurement and Instrumentation
The rectifier instrument is not free from

Frequency error
Wave shape error
All of the listed here
Temperature error

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Measurement and Instrumentation
A sinusoidal signal waveform, when observed on an oscilloscope, has a peak to peak amplitude of 6 cm. If the vertical sensitivity setting is 5 v/cm, then rms value of the voltage will be

 15 V.
 12.6 V.
 11.1 V.
  10.6 V.

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