Measurement and Instrumentation
A moving coil ammeter has a uniform scale with 50 division and gives a full scale reading 10 A. The instrument can read up to (1/5)th of a scale division with a fair degree of certainty. What is the resolution of the instrument in mA?

  40 mA.
 25 mA.
 50 mA.
 80 mA.

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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

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

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Measurement and Instrumentation
A Manganin swap resistance is connected in series with a moving coil ammeter consisting of a milli ammeter and a suitable shunt in order to

 Obtaine large deflecting torque.
 Minimize the effect of stray magnetic fields.
  Minimize the effect of temperature variation.
 Reduce the size of the meter.

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