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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.
 10.
  10√3.
 20√3.

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

 CT.
 Power transformer.
 Distribution transformer.
 PT.

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Measurement and Instrumentation
Comparison methods are used

 because they take least time in measurement.
 when a high accuracy of measurement is required.
 because they are most simple.
 because they are expensive.

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Measurement and Instrumentation
The two pressure coils of a single phase power factor meter have

The same dimension but different number of turns
The same dimensions and the same number of turns
The same number of turns but different dimensions
None of these

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Measurement and Instrumentation
Electrostatic instruments are normally used for

Low current measurements
High voltage measurements
Low voltage measurements
High current measurements

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Measurement and Instrumentation
A moving iron ammeter produces a full scale torque of 240 μNm with a deflection of 120° at a current of 10 A. The rate of change of self induction (μH/radian) of the instrument at full scale is

 114.6 μH/radian.
 4.8 μH/radian.
 12.0 μH/radian.
 2.0 μH/radian.

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