A moving-coil permanent-magnet instrument can be used as flux-meter_____________?
Correct answer: C. by eliminating the control springs
- A. by using a low resistance shunt
- B. by using a high series resistance
- C. by eliminating the control springs
- D. by making control springs of large moment of inertia
Explanation
A PMMC instrument becomes a flux meter when its control springs are removed, so the deflection depends on the total change in flux linkage rather than a restoring spring torque. A shunt would instead adapt the instrument for current measurement.
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