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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?
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Verified 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.
Most Upvoted Answer
Which of the following is not a requirement for a DC ammeter’s s...
The ability to measure direct current (DC) is the primary requirement for a DC ammeter. However, there are several additional requirements for a DC ammeter to operate accurately and safely. These requirements include:
1. Low resistance: The ammeter should have a low resistance so that it does not affect the circuit being measured. This ensures accurate current measurement.
2. Proper range: The ammeter should have a range suitable for the expected current values. It should be able to measure currents within this range without causing damage to the meter.
3. Proper scaling: The ammeter should have a clear and easy-to-read scale, with appropriate markings and divisions to accurately interpret the measured current.
4. Safety features: The ammeter should have safety features like fuses or overcurrent protection to prevent damage to the meter and ensure user safety.
5. Accuracy: The ammeter should provide accurate measurements within a specified tolerance limit.
Out of these requirements, the ability to measure direct current (DC) is not a requirement for a DC ammeter as it is inherent in its design.
1. Low resistance: The ammeter should have a low resistance so that it does not affect the circuit being measured. This ensures accurate current measurement.
2. Proper range: The ammeter should have a range suitable for the expected current values. It should be able to measure currents within this range without causing damage to the meter.
3. Proper scaling: The ammeter should have a clear and easy-to-read scale, with appropriate markings and divisions to accurately interpret the measured current.
4. Safety features: The ammeter should have safety features like fuses or overcurrent protection to prevent damage to the meter and ensure user safety.
5. Accuracy: The ammeter should provide accurate measurements within a specified tolerance limit.
Out of these requirements, the ability to measure direct current (DC) is not a requirement for a DC ammeter as it is inherent in its design.
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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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