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Which of the following is not a requirement for a DC ammeter’s shunt?
  • a)
    High thermal automotive force
  • b)
    Time-invariant
  • c)
    Low temperature coefficient
  • d)
    Carry current without excessive temperature rise
Correct answer is option 'A'. Can you explain this answer?
Most Upvoted Answer
Which of the following is not a requirement for a DC ammeter’s s...
The general requirements for shunts are:
  • The temperature coefficient of shunt and instrument should be low and should be as nearly as possible the same
  • The resistance of shunts should not vary with time i.e. time invariant
  • They should carry the current without excessive temperature rise
  • They should have a low thermal electromotive force with copper
  • Manganin is usually used for shunts of DC instruments as it gives a low value of thermal emf with copper although it is liable to corrosion and is difficult to solder.
  • Constantan is a useful material for AC circuits since its comparatively high thermal emf, being unidirectional, is ineffective in these circuits
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Community Answer
Which of the following is not a requirement for a DC ammeter’s s...
The ability to measure alternating current (AC) is not a requirement for a DC ammeter. DC ammeters are specifically designed to measure direct current (DC) only. AC ammeters, on the other hand, are used to measure alternating current.
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Which of the following is not a requirement for a DC ammeter’s shunt?a)High thermal automotive forceb)Time-invariantc)Low temperature coefficientd)Carry current without excessive temperature riseCorrect answer is option 'A'. Can you explain this answer?
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