SSC JE Electrical 2019 with solution SET-2
The type of damping used for moving iron instruments is

Eddy current damping
Air friction damping
Fluid friction damping
Gravity friction damping

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SSC JE Electrical 2019 with solution SET-2
The work done on or by a unit N-pole in moving once around a closed path is equal to

The product of current and number of turns enclosed by that path
The product of flux and number of turns enclosed by that path
Magnetic flux density
Reluctance

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