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Measurement and Instrumentation

Measurement and Instrumentation
An average reading digital multimeter reads 10 V when fed a triangular wave, symmetric about the axis. For the same input, an rms reading meter will read

 20.
 20√3.
 10.
  10√3.

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Measurement and Instrumentation
Relative permittivity can be measured by _______ bridge

 Desautys.
 Wheatstones.
 Schering.
 Hays.

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Measurement and Instrumentation
Which amplifier in used in an electronic amplifier?

 Power amplifier.
 Differential amplifier.
 Butter amplifer.
 Wideband amplifier.

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Measurement and Instrumentation
The internal resistance of a milli-ammeter must be very low for

 high precision.
 minimum effect on the current in the circuit.
 high accuracy.
 high sensitivity.

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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?

 2%
 4%
 3%
 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 ± 3) A
 (400 ± 2.24) A
 (400 ± 1) A
 (400 ±5) A

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