MEASURING INSTRUMENTS - Quiz

1) Why damping force is required in a moving coil instrument?

Makes the needle movement faster Helps the deflecting force to act fast Brings the needle to its zero position Arrests the needle without oscillations

2) What is the function of soft iron core in a moving coil instrument?

Strengthens the deflection force Controls the needle's movement Provides meter with maximum sensitivity Provide uniform distribution of magnetic flux in air gap

3) Which parameter is the cause for loading effect on measuring instruments?

Low accuracy High sensitivity Low sensitivity Low influence error

4) Which meter is used to measure revolution per minute of a motor?

Tachometer Energy meter Ampere hour meter Centre zero ammeter

5) How to identify the moving iron type instrument?

No terminal marking Terminal marked (+) only One terminal coloured red Terminal marked (+) and (-)