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

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

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Measurement and Instrumentation
Which of following is not correct?

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

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Measurement and Instrumentation
A resistance of 105 ohms is specified using significant figures as indicated below : 1. 105 ohms 2. 105.0 ohms 3. 0.000105 mega ohms Among these,

 2 and 3 represent greater precision than 1.
 1, 2 and 3 represent same precision.
 2 represents greater precision but 1 and 3 represent same precision.
 1 represents greater precision than 2 and 3.

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