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Measurement and Instrumentation

Measurement and Instrumentation
A wattmeter reads 30.34 W. The absolute error in the measurement is - 2.22 W. What is the true value of power?

None of these
 28.12 W.
 25.45 W.
 32.56 W .

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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
Voltage source will increase resistance
Current will decrease resistance
None of these

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Measurement and Instrumentation
When checked with an ohm meter an open resistor reads

  low but not zero.
  high but within tolerance.
  infinite.
  zero.

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Measurement and Instrumentation
In a portable instrument , the controlling torque is provided by

Gravity
Spring
Eddy currents
All of the listed here

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Measurement and Instrumentation
The resistance can be measured most accurately by

Bridge method
Megger
Multimeter
Voltmeter-ammeter method

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Measurement and Instrumentation
To measure high frequency currents, we mostly use ______ ammeter.

Thermocouple
Hot wire
Dynamometer
Moving iron

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