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Measurement and Instrumentation

Measurement and Instrumentation
In which of the transformer is the secondary nearly short circuited under normal operating condition?

 CT.
 Distribution transformer.
 Power transformer.
 PT.

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Measurement and Instrumentation
The limiting errors of measurement of power consumed by and the current passing through a resistance are ±1.5% and ±1% respectively. What is the limiting error ( in %) of measurement of resistance ?

 ± 2.5%
 ± 1.5%
 ±3.5%
 ± 1%

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Measurement and Instrumentation
The ratio of change in output to the change in the input is called

 repeatability
 resolution
 precision
 sensitivity

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Measurement and Instrumentation
When a potentiometer is used for measurement of voltage of an unknown source, the power consumed in the circuit of the unknown source under null condition is

 ideally zero.
 very high.
 small.
 high.

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Measurement and Instrumentation
A 150 V moving iron voltmeter of accuracy class 1-0 reads 75 V when used in a circuit under standard condition. The maximum possible percentage error in the reading is

 2%
 1.5%
 1%
 2.5%

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Measurement and Instrumentation
The meter constant of a single phase 240 V induction watthour meter is 400 revolutions per KWh. The speed of the meter disc for a current of 10 Amperes of 0.8 p.f lagging will be

 16.02 rpm.
 21.1 rpm.
  12.8 rpm.
 18.2 rpm.

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