SSC JE Electrical Engineering 2014 Set 1 Paper

Question : 146 of 200

Marks: +1, -0

If current through the operating coil of a moving iron instrument is doubled, the operating force becomes

one and a half times
2 times
3 times
4 times

Solution:

Moving Coil Instrument are of two types:
1. Attraction type
2. Repulsion type
The Deflection torque in both the instrument is proportional to the square of current
Deflection torque ∝ (Current)

^2

Hence, if the current is doubled the Deflecting Torque or operating force become four times.

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