Question: In a permanent magnet moving coil type of ammeter, the current is I=kθ/NBAWhere θ=deflection, k=spring constant, N=numbers of turns of moving coil and B=flux density of the field produced permanent magnet .Temperature is an interfering input to the system. It is known that strength of magnets reduces by 0.02 per cent per °C and the strength of springs reduces by 0. 4 Percent per °C. Which methods should be adopted to apply corrections for the interfering input?
Answer:
MCQ: In a permanent magnet moving coil type of ammeter, the current is I=kθ/NBAWhere θ=deflection, k=spring constant, N=numbers of turns of moving coil and B=flux density of the field produced permanent magnet .Temperature is an interfering input to the system. It is known that strength of magnets reduces by 0.02 per cent per °C and the strength of springs reduces by 0. 4 Percent per °C. Which methods should be adopted to apply corrections for the interfering input?
Correct Answer:
A. Method of inherent insensitivity
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