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Measurement and Instrumentation

Measurement and Instrumentation
Ryall crest voltmeter is used for measurement of

AC voltage of any form
High DC voltage
High AC voltage
Low frequency voltage

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Measurement and Instrumentation
The spring material used in a spring control device should have the following property.

All of the listed here
Should have low specific resistance
Should non magnetic
Most be of low temperature co-efficient

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Measurement and Instrumentation
An electrodynamic meter can be used to measure

 AC volatge.
 DC voltage.
 DC current.
  both AC and DC voltage.

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Measurement and Instrumentation
Which meter is suitable for the measurement of 10mV at 50MHz?

CRO
Moving coil voltmeter
VTVM
Moving iron voltmeter

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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

 ± 5%
 ± 6%
 ± 8%
 ± 7%

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Measurement and Instrumentation
Ratio of readings of two wattmeter connected to measure power in a balanced 3-phase load is 5:3 and the load is inductive. The power factor at load is

 0.6 lead.
 0.917 lead.
 0.917 lag.
 0.6 lag.

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