Measurement and Instrumentation
Which of following is not correct?

 A shunt should have a very low resistance.
  An electronic voltmeter draw appreciable current from the source.
 An ammeter should have a very low resitance.
 Voltmeter should have very high resistance.

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Measurement and Instrumentation
Which of following statement are correct in case of power factor meter?

 Both B and C.
 The deflection is proportional to phase angle between field coil and crossed coil.
 The restoring torque is provided by a controlling torque.
 It consist of two coils mounted at right angles to each other.

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Measurement and Instrumentation
For power measurement of three phase circuit by two wattmeter method, when the value of power factor is less than 0.5 lagging

Both give the same readings
One of the wattmeter connections will have to be reversed
One of the wattmeters will read zero
Pressure coil of the wattmeter will become ineffective.

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