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Questions and Answers
What is the purpose of adding a shunt resistance in a PMMC instrument used as an ammeter?
What is the purpose of adding a shunt resistance in a PMMC instrument used as an ammeter?
- To allow measuring large currents without destroying the PMMC wire (correct)
- To increase the sensitivity of the ammeter
- To minimize the effect of temperature change on the PMMC resistance
- To reduce the overall resistance of the ammeter circuit
What is the total current passing through the ammeter at full-scale deflection (FSD) in the given example?
What is the total current passing through the ammeter at full-scale deflection (FSD) in the given example?
- $10 mA$
- $1 mA$
- $0.1 mA$ (correct)
- $0.01 mA$
In a PMMC instrument used as an ammeter, where does most of the measured current pass at full-scale deflection (FSD)?
In a PMMC instrument used as an ammeter, where does most of the measured current pass at full-scale deflection (FSD)?
- Through the shunt resistance (correct)
- Through the swamping resistance
- Through the moving coil
- Equally through all components
What is the purpose of connecting a swamping resistance in series with a PMMC instrument used as an ammeter?
What is the purpose of connecting a swamping resistance in series with a PMMC instrument used as an ammeter?
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What happens to a PMMC instrument's coil resistance with temperature changes, and how is this issue addressed?
What happens to a PMMC instrument's coil resistance with temperature changes, and how is this issue addressed?
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