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Consider the following statements:
For a journal rotating in a bearing under film lubrication conditions, the frictional resistance is
1. Proportional to the area of contact
2. Proportional to the viscosity of lubricant
3. Proportional to the speed of rotation
4. Independent of the pressure
Q. Which of the statements given above are correct?
For a journal rotating in a bearing under film lubrication conditions, the frictional resistance is
1. Proportional to the area of contact
2. Proportional to the viscosity of lubricant
3. Proportional to the speed of rotation
4. Independent of the pressure
Q. Which of the statements given above are correct?
- a)1, 2, 3 and 4
- b)1 and 4 only
- c)2, 3 and 4 only
- d)2 and 3 only
Correct answer is option 'D'. Can you explain this answer?
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Verified Answer
Consider the following statements:For a journal rotating in a bearing ...
Frictional resistance ∝ Z
∝ N
∝ 1/p
So 2 or 3 is correct.
Most Upvoted Answer
Consider the following statements:For a journal rotating in a bearing ...
Frictional resistance in a journal rotating in a bearing under film lubrication conditions is influenced by various factors. Let's analyze each statement given above to determine which ones are correct.
1. Proportional to the area of contact:
The frictional resistance in a journal bearing is directly proportional to the area of contact between the journal and the bearing surface. As the contact area increases, more lubricant is sheared, resulting in higher frictional resistance. Therefore, statement 1 is correct.
2. Proportional to the viscosity of lubricant:
The viscosity of the lubricant plays a crucial role in determining the frictional resistance. Higher viscosity lubricants offer more resistance to shearing, resulting in increased frictional resistance. Hence, statement 2 is correct.
3. Proportional to the speed of rotation:
The speed of rotation affects the frictional resistance in a journal bearing. When the speed of rotation increases, the lubricant film thickness decreases due to the centrifugal force. This reduction in film thickness leads to increased frictional resistance. Therefore, statement 3 is correct.
4. Independent of the pressure:
Contrary to the statement, the frictional resistance in a journal bearing is influenced by the pressure. Increased pressure between the journal and the bearing surfaces leads to higher frictional resistance. Therefore, statement 4 is incorrect.
Based on the analysis above, the correct statements are 1, 2, and 3, while statement 4 is incorrect. Therefore, the correct answer is option 'D' - 2 and 3 only.
1. Proportional to the area of contact:
The frictional resistance in a journal bearing is directly proportional to the area of contact between the journal and the bearing surface. As the contact area increases, more lubricant is sheared, resulting in higher frictional resistance. Therefore, statement 1 is correct.
2. Proportional to the viscosity of lubricant:
The viscosity of the lubricant plays a crucial role in determining the frictional resistance. Higher viscosity lubricants offer more resistance to shearing, resulting in increased frictional resistance. Hence, statement 2 is correct.
3. Proportional to the speed of rotation:
The speed of rotation affects the frictional resistance in a journal bearing. When the speed of rotation increases, the lubricant film thickness decreases due to the centrifugal force. This reduction in film thickness leads to increased frictional resistance. Therefore, statement 3 is correct.
4. Independent of the pressure:
Contrary to the statement, the frictional resistance in a journal bearing is influenced by the pressure. Increased pressure between the journal and the bearing surfaces leads to higher frictional resistance. Therefore, statement 4 is incorrect.
Based on the analysis above, the correct statements are 1, 2, and 3, while statement 4 is incorrect. Therefore, the correct answer is option 'D' - 2 and 3 only.
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Consider the following statements:For a journal rotating in a bearing under film lubrication conditions, the frictional resistance is1. Proportional to the area of contact2. Proportional to the viscosity of lubricant3. Proportional to the speed of rotation4. Independent of the pressureQ. Which of the statements given above are correct?a)1, 2, 3 and 4b)1 and 4 onlyc)2, 3 and 4 onlyd)2 and 3 onlyCorrect answer is option 'D'. Can you explain this answer?
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Consider the following statements:For a journal rotating in a bearing under film lubrication conditions, the frictional resistance is1. Proportional to the area of contact2. Proportional to the viscosity of lubricant3. Proportional to the speed of rotation4. Independent of the pressureQ. Which of the statements given above are correct?a)1, 2, 3 and 4b)1 and 4 onlyc)2, 3 and 4 onlyd)2 and 3 onlyCorrect answer is option 'D'. 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 statements:For a journal rotating in a bearing under film lubrication conditions, the frictional resistance is1. Proportional to the area of contact2. Proportional to the viscosity of lubricant3. Proportional to the speed of rotation4. Independent of the pressureQ. Which of the statements given above are correct?a)1, 2, 3 and 4b)1 and 4 onlyc)2, 3 and 4 onlyd)2 and 3 onlyCorrect answer is option 'D'. 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 statements:For a journal rotating in a bearing under film lubrication conditions, the frictional resistance is1. Proportional to the area of contact2. Proportional to the viscosity of lubricant3. Proportional to the speed of rotation4. Independent of the pressureQ. Which of the statements given above are correct?a)1, 2, 3 and 4b)1 and 4 onlyc)2, 3 and 4 onlyd)2 and 3 onlyCorrect answer is option 'D'. Can you explain this answer?.
Consider the following statements:For a journal rotating in a bearing under film lubrication conditions, the frictional resistance is1. Proportional to the area of contact2. Proportional to the viscosity of lubricant3. Proportional to the speed of rotation4. Independent of the pressureQ. Which of the statements given above are correct?a)1, 2, 3 and 4b)1 and 4 onlyc)2, 3 and 4 onlyd)2 and 3 onlyCorrect answer is option 'D'. 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 statements:For a journal rotating in a bearing under film lubrication conditions, the frictional resistance is1. Proportional to the area of contact2. Proportional to the viscosity of lubricant3. Proportional to the speed of rotation4. Independent of the pressureQ. Which of the statements given above are correct?a)1, 2, 3 and 4b)1 and 4 onlyc)2, 3 and 4 onlyd)2 and 3 onlyCorrect answer is option 'D'. 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 statements:For a journal rotating in a bearing under film lubrication conditions, the frictional resistance is1. Proportional to the area of contact2. Proportional to the viscosity of lubricant3. Proportional to the speed of rotation4. Independent of the pressureQ. Which of the statements given above are correct?a)1, 2, 3 and 4b)1 and 4 onlyc)2, 3 and 4 onlyd)2 and 3 onlyCorrect answer is option 'D'. Can you explain this answer?.
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