Deflection Type Ammeters and Voltmeters
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Questions and Answers

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?

  • $10 mA$
  • $1 mA$
  • $0.1 mA$ (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)?

  • 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?

    <p>To minimize the effect of temperature change on the PMMC resistance</p> Signup and view all the answers

    What happens to a PMMC instrument's coil resistance with temperature changes, and how is this issue addressed?

    <p>The coil resistance increases with temperature, and it is addressed by connecting a swamping resistance in series.</p> Signup and view all the answers

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