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

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

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Measurement and Instrumentation
Consider the following statement - 1. The compensating coil of a low power factor wattmeter compensates the effect of the impedance of the current coil. 2. The compensating coil of a low power factor wattmeter compensates the effect of the impedance of the voltage coil circuit.

 Both 1 and 2 are true.
  1 is false but 2 is true.
 1 is true but 2 is false.
 Both 1 and 2 are false.

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Measurement and Instrumentation
A DC potentiometer is the best means available for the measurement of DC voltage because

 The precision in measurment is independent of the type of the defector used.
 None of above.
  It is based on null balance technique.
 It is possible to standardize before a measurement is undertaken.

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