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Measurement and Instrumentation

Measurement and Instrumentation
The absolute measurement of resistance is done by

Ohm’s law method
Bridge Method
Lorenz method
Rayleigh method

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Measurement and Instrumentation
Wagner earthing device is used to eliminate errors due to

None of these
Electrostatic coupling
Both A and B
Electromagnetic coupling

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Measurement and Instrumentation
Attraction and repulsion type instruments are the two different types of which instrument ?

 Multipliers.
 Dynamo-meter type.
 Induction type.
  Moving iron type.

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Measurement and Instrumentation
An ammeter is a

Integrating instrument
Absolute instrument
Recording instrument
Secondary instrument

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Measurement and Instrumentation
When using ohmmeter, applied voltage is to be disconnected from the circuit because

The ohmmeter has its own internal battery
None of these
Current will decrease resistance
Voltage source will increase resistance

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Measurement and Instrumentation
A set of independent current measurements taken by four observers was recorded as : 117.02 mA, 117.11 mA, 117.08 mA and 117.03 mA. What is the range of error ?

 ± 0.056
 ± 0.054
 ± 0.065
 ± 0.045

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