MEASURING INSTRUMENT - Practice Mode

1) Why the pointer of a megger is in any place on the scale while it is in idle?

The deflecting torque is proportional to current The deflecting torque on the meter is inversely proportional to current The instrument does not have controlling torque The deflecting torque is inversely proportional to square of the current

Correct Answer: The instrument does not have controlling torque

2) Which principle earth tester works?

Induction Magnetic attraction Magnetic deflection Fall of Potential

Correct Answer: Fall of Potential

3) What is the name of term that the ability of the measuring instrument to agree with itself repeatedly?

Precision Sensitivity Resolution Accuracy

Correct Answer: Precision

4) What is the cause for creeping error in Energy meter?

Change in resistance Improper power factor Rotation of disc when the load is OFF Abnormal friction of the moving system

Correct Answer: Rotation of disc when the load is OFF

5) How the low range of the ammeter can be extended to higher range?

By connecting a shunt resistor in parallel across meter coil By connecting a resistor in series with meter coil By connecting a resistor in series with supply By connecting two resistors across with supply

Correct Answer: By connecting a shunt resistor in parallel across meter coil

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