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Which of the following is not a desired characteristic of shunts used in PMMC instruments?
- a)The resistance of the shunt should not vary with time.
- b)It must be manufactured using manganin or copper.
- c)It should have a low thermal emf.
- d)It should carry the current without excessive temperature rise.
Correct answer is option 'B'. Can you explain this answer?
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Most Upvoted Answer
Which of the following is not a desired characteristic of shunts used ...
Explanation:
Characteristics of Shunts in PMMC Instruments:
- Resistance stability: The resistance of the shunt should not vary with time to ensure accurate current measurements over the instrument's lifespan.
- Low thermal emf: Shunts should have a low thermal emf to prevent errors in current readings due to temperature variations.
- Low temperature rise: Shunts should be able to carry the current without excessive temperature rise to prevent overheating and ensure reliable operation.
- Material: Shunts are commonly manufactured using materials like manganin or copper due to their high conductivity and low temperature coefficient of resistance.
- Explanation of the correct answer: Option 'B' states that shunts must be manufactured using manganin or copper, which is incorrect. While these materials are commonly used for shunts, it is not a strict requirement. Shunts can be made from other materials as long as they meet the desired characteristics of stability, low thermal emf, and low temperature rise.
Characteristics of Shunts in PMMC Instruments:
- Resistance stability: The resistance of the shunt should not vary with time to ensure accurate current measurements over the instrument's lifespan.
- Low thermal emf: Shunts should have a low thermal emf to prevent errors in current readings due to temperature variations.
- Low temperature rise: Shunts should be able to carry the current without excessive temperature rise to prevent overheating and ensure reliable operation.
- Material: Shunts are commonly manufactured using materials like manganin or copper due to their high conductivity and low temperature coefficient of resistance.
- Explanation of the correct answer: Option 'B' states that shunts must be manufactured using manganin or copper, which is incorrect. While these materials are commonly used for shunts, it is not a strict requirement. Shunts can be made from other materials as long as they meet the desired characteristics of stability, low thermal emf, and low temperature rise.
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Community Answer
Which of the following is not a desired characteristic of shunts used ...
The desired characteristics of shunts used in PMMC (Permanent Magnet Moving Coil) instruments include:
A: The resistance of the shunt should not vary with time. This ensures the accuracy and stability of the instrument's measurements.
C: It should have a low thermal emf. This helps minimize any error caused by temperature variations.
D: It should carry the current without excessive temperature rise. This ensures that the shunt can handle the current without overheating, which could affect its accuracy and reliability.
However, the material used to manufacture the shunt is not a specific desired characteristic. While manganin or copper are commonly used materials for shunts due to their low resistance and good conductivity, other materials can also be used depending on the specific requirements of the application. Therefore, option B is not a desired characteristic of shunts used in PMMC instruments.
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Which of the following is not a desired characteristic of shunts used in PMMC instruments?a)The resistance of the shunt should not vary with time.b)It must be manufactured using manganin or copper.c)It should have a low thermal emf.d)It should carry the current without excessive temperature rise.Correct answer is option 'B'. Can you explain this answer?
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