Mechanical Engineering Exam > Mechanical Engineering Questions > Which one of the following is the correct sta...
Start Learning for Free
Which one of the following is the correct statement?
Pearlite in iron-carbon system is a
Pearlite in iron-carbon system is a
- a)Phase consisting of ferrite and cementite at room temperature
- b)Mechanical mixture of ferrite and cementite at room temperature
- c)Eutectic mixture ferrite and cementite at room temperature
- d)All the above three are correct
Correct answer is option 'B'. Can you explain this answer?
| FREE This question is part of | Download PDF Attempt this Test |
Verified Answer
Which one of the following is the correct statement?Pearlite in iron-c...
Ans. (b) Since the chemical separation occurs entirely within crystalline solids, the
resultant structure is a five mechanical mixture of ferrite & cementite.
Pearlite is a eutectoid mixture of ferrite and cementite.
resultant structure is a five mechanical mixture of ferrite & cementite.
Pearlite is a eutectoid mixture of ferrite and cementite.
Most Upvoted Answer
Which one of the following is the correct statement?Pearlite in iron-c...
Pearlite in Iron-Carbon System
Pearlite is a microstructure that forms in the iron-carbon system at temperatures below the eutectoid temperature. It consists of alternating layers of ferrite and cementite.
Explanation:
1. Phase consisting of ferrite and cementite at room temperature:
This statement is incorrect. At room temperature, the phase present in the iron-carbon system is usually ferrite or cementite, not pearlite. Ferrite is a solid solution of carbon in alpha-iron, while cementite is a compound of iron and carbon with a fixed composition.
2. Mechanical mixture of ferrite and cementite at room temperature:
This statement is correct. Pearlite is formed through a eutectoid reaction, which occurs at temperatures below the eutectoid temperature (727°C for hypo-eutectoid steels). During this reaction, the austenite transforms into pearlite, which is a lamellar microstructure consisting of alternating layers of ferrite and cementite. The formation of pearlite involves the diffusion of carbon atoms and the growth of ferrite and cementite layers. Therefore, pearlite is considered a mechanical mixture of ferrite and cementite.
3. Eutectic mixture of ferrite and cementite at room temperature:
This statement is incorrect. Eutectic mixtures involve the simultaneous solidification of two phases from a liquid phase, whereas pearlite forms through a solid-state transformation. Hence, pearlite is not an eutectic mixture of ferrite and cementite at room temperature.
4. All the above three are correct:
This statement is incorrect. Only the second statement, which states that pearlite is a mechanical mixture of ferrite and cementite at room temperature, is correct.
To summarize, pearlite is a lamellar microstructure that forms in the iron-carbon system at temperatures below the eutectoid temperature. It consists of alternating layers of ferrite and cementite and is considered a mechanical mixture rather than a phase or eutectic mixture.
Pearlite is a microstructure that forms in the iron-carbon system at temperatures below the eutectoid temperature. It consists of alternating layers of ferrite and cementite.
Explanation:
1. Phase consisting of ferrite and cementite at room temperature:
This statement is incorrect. At room temperature, the phase present in the iron-carbon system is usually ferrite or cementite, not pearlite. Ferrite is a solid solution of carbon in alpha-iron, while cementite is a compound of iron and carbon with a fixed composition.
2. Mechanical mixture of ferrite and cementite at room temperature:
This statement is correct. Pearlite is formed through a eutectoid reaction, which occurs at temperatures below the eutectoid temperature (727°C for hypo-eutectoid steels). During this reaction, the austenite transforms into pearlite, which is a lamellar microstructure consisting of alternating layers of ferrite and cementite. The formation of pearlite involves the diffusion of carbon atoms and the growth of ferrite and cementite layers. Therefore, pearlite is considered a mechanical mixture of ferrite and cementite.
3. Eutectic mixture of ferrite and cementite at room temperature:
This statement is incorrect. Eutectic mixtures involve the simultaneous solidification of two phases from a liquid phase, whereas pearlite forms through a solid-state transformation. Hence, pearlite is not an eutectic mixture of ferrite and cementite at room temperature.
4. All the above three are correct:
This statement is incorrect. Only the second statement, which states that pearlite is a mechanical mixture of ferrite and cementite at room temperature, is correct.
To summarize, pearlite is a lamellar microstructure that forms in the iron-carbon system at temperatures below the eutectoid temperature. It consists of alternating layers of ferrite and cementite and is considered a mechanical mixture rather than a phase or eutectic mixture.
Attention Mechanical Engineering Students!
To make sure you are not studying endlessly, EduRev has designed Mechanical Engineering study material, with Structured Courses, Videos, & Test Series. Plus get personalized analysis, doubt solving and improvement plans to achieve a great score in Mechanical Engineering.
|
Explore Courses for Mechanical Engineering exam
|
|
Similar Mechanical Engineering Doubts
Top Courses for Mechanical EngineeringView all
Which one of the following is the correct statement?Pearlite in iron-carbon system is aa)Phase consisting of ferrite and cementite at room temperatureb)Mechanical mixture of ferrite and cementite at room temperaturec)Eutectic mixture ferrite and cementite at room temperatured)All the above three are correctCorrect answer is option 'B'. Can you explain this answer?
Question Description
Which one of the following is the correct statement?Pearlite in iron-carbon system is aa)Phase consisting of ferrite and cementite at room temperatureb)Mechanical mixture of ferrite and cementite at room temperaturec)Eutectic mixture ferrite and cementite at room temperatured)All the above three are correctCorrect answer is option 'B'. 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 Which one of the following is the correct statement?Pearlite in iron-carbon system is aa)Phase consisting of ferrite and cementite at room temperatureb)Mechanical mixture of ferrite and cementite at room temperaturec)Eutectic mixture ferrite and cementite at room temperatured)All the above three are correctCorrect answer is option 'B'. 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 Which one of the following is the correct statement?Pearlite in iron-carbon system is aa)Phase consisting of ferrite and cementite at room temperatureb)Mechanical mixture of ferrite and cementite at room temperaturec)Eutectic mixture ferrite and cementite at room temperatured)All the above three are correctCorrect answer is option 'B'. Can you explain this answer?.
Which one of the following is the correct statement?Pearlite in iron-carbon system is aa)Phase consisting of ferrite and cementite at room temperatureb)Mechanical mixture of ferrite and cementite at room temperaturec)Eutectic mixture ferrite and cementite at room temperatured)All the above three are correctCorrect answer is option 'B'. 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 Which one of the following is the correct statement?Pearlite in iron-carbon system is aa)Phase consisting of ferrite and cementite at room temperatureb)Mechanical mixture of ferrite and cementite at room temperaturec)Eutectic mixture ferrite and cementite at room temperatured)All the above three are correctCorrect answer is option 'B'. 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 Which one of the following is the correct statement?Pearlite in iron-carbon system is aa)Phase consisting of ferrite and cementite at room temperatureb)Mechanical mixture of ferrite and cementite at room temperaturec)Eutectic mixture ferrite and cementite at room temperatured)All the above three are correctCorrect answer is option 'B'. Can you explain this answer?.
Solutions for Which one of the following is the correct statement?Pearlite in iron-carbon system is aa)Phase consisting of ferrite and cementite at room temperatureb)Mechanical mixture of ferrite and cementite at room temperaturec)Eutectic mixture ferrite and cementite at room temperatured)All the above three are correctCorrect answer is option 'B'. Can you explain this answer? in English & in Hindi are available as part of our courses for Mechanical Engineering.
Download more important topics, notes, lectures and mock test series for Mechanical Engineering Exam by signing up for free.
Here you can find the meaning of Which one of the following is the correct statement?Pearlite in iron-carbon system is aa)Phase consisting of ferrite and cementite at room temperatureb)Mechanical mixture of ferrite and cementite at room temperaturec)Eutectic mixture ferrite and cementite at room temperatured)All the above three are correctCorrect answer is option 'B'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of
Which one of the following is the correct statement?Pearlite in iron-carbon system is aa)Phase consisting of ferrite and cementite at room temperatureb)Mechanical mixture of ferrite and cementite at room temperaturec)Eutectic mixture ferrite and cementite at room temperatured)All the above three are correctCorrect answer is option 'B'. Can you explain this answer?, a detailed solution for Which one of the following is the correct statement?Pearlite in iron-carbon system is aa)Phase consisting of ferrite and cementite at room temperatureb)Mechanical mixture of ferrite and cementite at room temperaturec)Eutectic mixture ferrite and cementite at room temperatured)All the above three are correctCorrect answer is option 'B'. Can you explain this answer? has been provided alongside types of Which one of the following is the correct statement?Pearlite in iron-carbon system is aa)Phase consisting of ferrite and cementite at room temperatureb)Mechanical mixture of ferrite and cementite at room temperaturec)Eutectic mixture ferrite and cementite at room temperatured)All the above three are correctCorrect answer is option 'B'. Can you explain this answer? theory, EduRev gives you an
ample number of questions to practice Which one of the following is the correct statement?Pearlite in iron-carbon system is aa)Phase consisting of ferrite and cementite at room temperatureb)Mechanical mixture of ferrite and cementite at room temperaturec)Eutectic mixture ferrite and cementite at room temperatured)All the above three are correctCorrect answer is option 'B'. Can you explain this answer? tests, examples and also practice Mechanical Engineering tests.
|
|
Explore Courses for Mechanical Engineering exam
|
|
Suggested Free Tests
Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
|
© EduRev
|
Education Revolution
|
Follow Us
|
Signup to see your scores
go up within 7 days!
Access 1000+ FREE Docs, Videos and Tests
Takes less than 10 seconds to signup