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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√3.
 20.
  10√3.
 10.

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Measurement and Instrumentation
A metal strain gauge has a gauge factor of two. Its nominal resistance is 120 ohms. If it undergoes a strain of 10-5, the value of change of resistance in response to the strain is

 0.0012 Ohm.
 240 Ohm.
 0.0024 Ohm.
 120 Ohm.

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Measurement and Instrumentation
Null type recorders are

 LVDT recorders.
 any one of the above.
 bridge recorders.
 potentiometric recorders.

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Measurement and Instrumentation
The measured value of a resistance is 10.25 ohm, whereas its value of 10.22 ohm. What is absolute error of the measurement?

 15.36 ohm.
  0.03 ohm.
 0.01 ohm.
 10.26 ohm.

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Measurement and Instrumentation
A moving iron ammeter may be compensated for frequency errors by

A shunt resistance
Shunt capacitance
A series inductance
Series resistance

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Measurement and Instrumentation
Which of following are needed both for protection and metering?

 Energy meter.
 Wattmeters.
 Instrument transformer.
 Power factor meters.

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