Eddy current damping is not used on repulsion type instrument because

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RRB Paper · Accepted Answer

Eddy current damping is not used on repulsion type instrument because the presence of a permanent magnet required for damping would affect the deflection and hence the reading of the instrument. In a repulsion type ammeter, the interaction between the two coils produces a force that deflects the pointer, and any external force or magnetic field can interfere with this interaction, leading to errors in the measurement. Therefore, other types of damping, such as air friction damping or fluid damping, are used in repulsion type instruments to minimize the oscillation of the pointer after the current is switched off.

Eddy current damping is not used on repulsion type instrument because

The presence of a permanent magnet required for damping would affect the deflection and hence the re

The presence of permanent magnet will result in overheating of the coil

An uneven scale will be required and the instrument will require calibration every time

Excessive vibrations will result in the disc due to eddy; currents

thereby affecting its accuracy.

The correct answer is `No. 1: The presence of a permanent magnet required for damping would affect the deflection and hence the re`

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Eddy current damping is not used on repulsion type instrument because

The presence of a permanent magnet required for damping would affect the deflection and hence the re

The presence of permanent magnet will result in overheating of the coil

An uneven scale will be required and the instrument will require calibration every time

Excessive vibrations will result in the disc due to eddy; currents

thereby affecting its accuracy.

The correct answer is No. 1: The presence of a permanent magnet required for damping would affect the deflection and hence the re

The correct answer is `No. 1: The presence of a permanent magnet required for damping would affect the deflection and hence the re`