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GATE Past Year Questions: Bearings | Design of Machine Elements - Mechanical Engineering PDF Download

Question for GATE Past Year Questions: Bearings
Try yourself:Which of the bearings given below SHOULD NOT be subjected to a thrust load?

[2016,Set-3]

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Question for GATE Past Year Questions: Bearings
Try yourself:Two identical ball bearings Pand Q are operating at loads 30 kN and 45 kN respectively. The ratio of the life of bearing P to the life of bearing Q is

[2011]

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Question for GATE Past Year Questions: Bearings
Try yourself:A lightly loaded full Journal bearing has Journal diameter of 50 mm, bush bore of 50.05 mm and bush length of 20 mm. If rotational speed of Journal is 1200 rpm and average viscosity of liquid lubricant is 0.03 Pa s, the power loss (in W) will be

[2010]

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Question for GATE Past Year Questions: Bearings
Try yourself:A Journal bearing has a shaft diameter of 40 mm and a length of 40 mm. The shaft is rotating at 20 rad/s and the viscosity of the lubricant is 20 mPa.s. The clearance is 0.020 mm. The loss of torque due to the viscosity of the lubricant is approximately

[2008]

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Question for GATE Past Year Questions: Bearings
Try yourself:A natural feed Journal bearing of diameter 50 mm and length 50 mm operating at 20 revolution/sec. carries a load of 2.0 kN. The lubricant used has a viscosity of 20 mPa.s. The radial clearance is 50 mm. The Sommerfield number for the bearings is

[2007]

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Question for GATE Past Year Questions: Bearings
Try yourself:A ball bearing operating at a load F has 8000 hours of life. The life of the bearing, in hours, when the load is doubled to 2F is

[2007]

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Question for GATE Past Year Questions: Bearings
Try yourself:Which one of the following is criterion in the design of hydrodynamic Journal bearings?

[2005]

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Question for GATE Past Year Questions: Bearings
Try yourself:The basic load rating of a ball bearing is

[2005]

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Question for GATE Past Year Questions: Bearings
Try yourself:The dynamic load capacity of 6306 bearing is 22 kN. The maximum radial load it can sustain to operate at 600 rev/min, for 2000 hours is

[1997]

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Question for GATE Past Year Questions: Bearings
Try yourself:To restore stable operating condition in a hydrodynamic Journal bearing, when it encounters higher magnitude of loads

[1997]

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Question for GATE Past Year Questions: Bearings
Try yourself:In thick film hydrodynamic Journal bearings, the coefficient of friction

[1996]

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Question for GATE Past Year Questions: Bearings
Try yourself:Spherical roller bearings are normally used

[1992]

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Question for GATE Past Year Questions: Bearings
Try yourself:Starting friction is low in

[1992]

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Question for GATE Past Year Questions: Bearings
Try yourself:If the load on a ball bearing is reduced to half, the life of the ball bearing will

[1988]

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Question for GATE Past Year Questions: Bearings
Try yourself:The expected life of a ball bearing subjected to a load of 9800 N and working at 1000 rpm is 3000 hours. What is the expected life of the same bearing for a similar load of 4900 N and speed of 2000 rpm?

[1987]

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FAQs on GATE Past Year Questions: Bearings - Design of Machine Elements - Mechanical Engineering

1. What is the importance of bearings in mechanical engineering?
Ans. Bearings play a crucial role in mechanical engineering as they support rotating components, reduce friction, and enable smooth motion. They help in transmitting loads and facilitating the movement of machine parts, ensuring efficient operation and longevity of mechanical systems.
2. What are the different types of bearings used in mechanical engineering?
Ans. There are various types of bearings used in mechanical engineering, including: - Ball bearings: These are the most common type and consist of rolling balls held in a cage, providing low friction and high load capacity. - Roller bearings: They have cylindrical, tapered, or spherical rolling elements and are suitable for heavy-duty applications. - Thrust bearings: These are designed to handle axial loads and can be ball, roller, or needle type depending on the application. - Plain bearings: Also known as bushings, these provide a sliding interface and require lubrication to minimize friction. - Needle bearings: They have long, thin rollers and are used in applications with limited radial space.
3. How can one select the appropriate bearing for a specific mechanical application?
Ans. Selecting the right bearing involves considering factors such as load type, magnitude, and direction, rotational speed, temperature, and environmental conditions. It is essential to consult bearing manufacturers' catalogs and technical specifications to determine the suitable bearing type, size, and material. Additionally, factors like bearing life, maintenance requirements, and cost should be taken into account for optimal selection.
4. What are the common causes of bearing failure in mechanical systems?
Ans. Bearing failure can occur due to various reasons, including: - Insufficient lubrication: Inadequate lubrication can lead to increased friction, heat, and wear, causing premature bearing failure. - Contamination: The presence of dirt, debris, or moisture can cause abrasive wear, corrosion, and pitting, leading to bearing damage. - Overloading: Excessive loads beyond the bearing's capacity can result in deformation, fatigue, and eventual failure. - Misalignment: Improper alignment of shafts and bearings can cause uneven loading and misalignment forces, leading to failure. - Improper installation: Incorrect installation techniques, such as improper fits or incorrect bearing clearance, can contribute to premature failure.
5. How can one prevent bearing failure and ensure their proper functioning in mechanical systems?
Ans. To prevent bearing failure, several measures can be taken: - Proper lubrication: Ensure the right type and amount of lubricant are used and follow recommended lubrication intervals. - Regular maintenance: Monitor bearing condition, check for signs of wear or damage, and perform timely maintenance tasks like re-greasing or replacement. - Contamination control: Keep the bearing environment clean, use seals or shields to protect against contaminants, and avoid excessive moisture or dust. - Correct installation: Follow proper installation procedures, including correct fits, axial and radial clearance, and appropriate mounting techniques. - Avoid overloading: Ensure bearings are not subjected to excessive loads beyond their rated capacity, and consider using multiple bearings or adjusting the system design if necessary.
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Document Description: GATE Past Year Questions: Bearings for Mechanical Engineering 2024 is part of Design of Machine Elements preparation. The notes and questions for GATE Past Year Questions: Bearings have been prepared according to the Mechanical Engineering exam syllabus. Information about GATE Past Year Questions: Bearings covers topics like and GATE Past Year Questions: Bearings Example, for Mechanical Engineering 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises and tests below for GATE Past Year Questions: Bearings.
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