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Consider the following quenching media:
1. Oil
2. Water
3. Water + NaOH
4. BrineThe correct sequence of these media in order of increasing hardness of steel undergoing heattreatment is
1. Oil
2. Water
3. Water + NaOH
4. BrineThe correct sequence of these media in order of increasing hardness of steel undergoing heattreatment is
- a)1, 3, 2, 4
- b)2, 1, 3, 4
- c)1, 2, 3, 4
- d)4, 3, 2, 1
Correct answer is option 'C'. Can you explain this answer?
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Consider the following quenching media:1. Oil2. Water3. Water + NaOH4....
Ans. (c)
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Consider the following quenching media:1. Oil2. Water3. Water + NaOH4....
Quenching is a heat treatment process used to harden steel by rapidly cooling it after it has been heated to a specific temperature. The choice of quenching media is crucial as it determines the hardness and other properties of the steel. The options given are oil, water, water with NaOH (sodium hydroxide), and brine. Let's analyze each of these quenching media in terms of their hardness.
1. Oil:
- Oil is a commonly used quenching medium for steel.
- It offers a moderate cooling rate, which results in a lower hardness compared to water.
- The slower cooling rate allows for reduced distortion and cracking, making it suitable for larger and more complex parts.
- However, the hardness achieved with oil quenching is generally lower compared to water quenching.
2. Water:
- Water is a faster quenching medium than oil, leading to higher hardness in the steel.
- It provides a rapid cooling rate, which results in a harder and more brittle structure.
- Water quenching is suitable for small and simple parts where distortion and cracking are not major concerns.
- However, the rapid cooling can lead to an increased risk of distortion and cracking, especially for larger and more complex parts.
3. Water with NaOH (sodium hydroxide):
- The addition of sodium hydroxide to water as a quenching medium enhances the cooling rate compared to plain water.
- This increased cooling rate results in even higher hardness in the steel.
- The presence of sodium hydroxide can also improve the surface finish of the quenched steel.
- However, the use of water with sodium hydroxide requires careful handling and safety precautions due to the caustic nature of the chemical.
4. Brine:
- Brine is a solution of salt (usually sodium chloride) in water.
- It provides an even higher cooling rate than water, leading to the highest hardness among the options given.
- The use of brine is suitable for achieving maximum hardness in steel.
- However, similar to water with sodium hydroxide, the use of brine requires caution due to the corrosive nature of the solution.
Based on the above analysis, the correct sequence of these quenching media in order of increasing hardness of steel undergoing heat treatment is:
1. Oil (moderate cooling rate)
2. Water (faster cooling rate)
3. Water with NaOH (enhanced cooling rate)
4. Brine (highest cooling rate)
Therefore, the correct answer is option 'C' (1, 2, 3, 4).
1. Oil:
- Oil is a commonly used quenching medium for steel.
- It offers a moderate cooling rate, which results in a lower hardness compared to water.
- The slower cooling rate allows for reduced distortion and cracking, making it suitable for larger and more complex parts.
- However, the hardness achieved with oil quenching is generally lower compared to water quenching.
2. Water:
- Water is a faster quenching medium than oil, leading to higher hardness in the steel.
- It provides a rapid cooling rate, which results in a harder and more brittle structure.
- Water quenching is suitable for small and simple parts where distortion and cracking are not major concerns.
- However, the rapid cooling can lead to an increased risk of distortion and cracking, especially for larger and more complex parts.
3. Water with NaOH (sodium hydroxide):
- The addition of sodium hydroxide to water as a quenching medium enhances the cooling rate compared to plain water.
- This increased cooling rate results in even higher hardness in the steel.
- The presence of sodium hydroxide can also improve the surface finish of the quenched steel.
- However, the use of water with sodium hydroxide requires careful handling and safety precautions due to the caustic nature of the chemical.
4. Brine:
- Brine is a solution of salt (usually sodium chloride) in water.
- It provides an even higher cooling rate than water, leading to the highest hardness among the options given.
- The use of brine is suitable for achieving maximum hardness in steel.
- However, similar to water with sodium hydroxide, the use of brine requires caution due to the corrosive nature of the solution.
Based on the above analysis, the correct sequence of these quenching media in order of increasing hardness of steel undergoing heat treatment is:
1. Oil (moderate cooling rate)
2. Water (faster cooling rate)
3. Water with NaOH (enhanced cooling rate)
4. Brine (highest cooling rate)
Therefore, the correct answer is option 'C' (1, 2, 3, 4).
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Consider the following quenching media:1. Oil2. Water3. Water + NaOH4. BrineThe correct sequence of these media in order of increasing hardness of steel undergoing heattreatment isa)1, 3, 2, 4b)2, 1, 3, 4c)1, 2, 3, 4d)4, 3, 2, 1Correct answer is option 'C'. Can you explain this answer?
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Consider the following quenching media:1. Oil2. Water3. Water + NaOH4. BrineThe correct sequence of these media in order of increasing hardness of steel undergoing heattreatment isa)1, 3, 2, 4b)2, 1, 3, 4c)1, 2, 3, 4d)4, 3, 2, 1Correct answer is option 'C'. Can you explain this answer? for Mechanical Engineering 2024 is part of Mechanical Engineering preparation. The Question and answers have been prepared according to the Mechanical Engineering exam syllabus. Information about Consider the following quenching media:1. Oil2. Water3. Water + NaOH4. BrineThe correct sequence of these media in order of increasing hardness of steel undergoing heattreatment isa)1, 3, 2, 4b)2, 1, 3, 4c)1, 2, 3, 4d)4, 3, 2, 1Correct answer is option 'C'. Can you explain this answer? covers all topics & solutions for Mechanical Engineering 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Consider the following quenching media:1. Oil2. Water3. Water + NaOH4. BrineThe correct sequence of these media in order of increasing hardness of steel undergoing heattreatment isa)1, 3, 2, 4b)2, 1, 3, 4c)1, 2, 3, 4d)4, 3, 2, 1Correct answer is option 'C'. Can you explain this answer?.
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