ANNA UNIVERSITY CHENNAI
REGULATION 2013
ME6503-DESIGN OF MACHINE ELEMENTS
UNIVERSITY QUESTIONS
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PART-A
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PART-A
1. List any two advantages of rolling contact bearings.
2. Define coefficient of steadiness.
3. What is meant by journal bearing?
4. Classify the types of bearings.
5. What is meant by life of anti-friction bearings?
6. What are the essential requirements in an end face seal?
7. State the merits of hydrostatic bearings.
8. Differentiate sliding contact and rolling contact bearings.
9. What is the illumination of McKee’s equation?
10. Distinguish between hydrostatic and hydrodynamic bearings.
11. Explain the term Dynamic load carrying capacities of rolling contact bearing.
Part - B
1. Design a journal bearing for a centrifugal pump with the following data: Diameter of the journal =150mm. Load on bearing=40KN, Speed of journal=900 rpm.
2. Select a bearing for a 40 mm diameter shaft rotates at 400 rpm. Due to bevel gear mounted on the shaft, the bearing will have to withstand a 5000N radial and a 3000N thrust load. The life of the bearing expected to be at least 1000 hrs.
3. A Single row deep groove ball bearing operating at 2000 rpm is acted by a 10 KN radial load and 8 KN thrust load. The bearing is subjected to a light shock load and the outer ring is rotating. Determine the rating life of the bearing.
4. Design a journal bearing for a centrifugal pump for the following data: Load on the journal =2000N; Speed of the journal=900 rpm; Type of oil is SAE 10, for which the absolute viscosity at C =0.17 N/m-s; Ambient temperature of oil=C, Maximum bearing pressure for the pump=1.5 N/.Calculate also mass of lubricating oil required for artificial cooling, if rise of temperature of oil be limited to C. Heat dissipation coefficient=1232W//oC.
5. A single row deep grove ball bearing is subjected to a radial force of 8 kN and a thrust force of 3kN. The shaft rotates at 1200 rpm. The expected life of the bearing of the shaft is 75mm. Select a suitable ball bearing for this application.
6. The radial reaction on a bearing is 8000N. It also carries a thrust of 5000N. The shaft diameter is 140mm and it rotates at 1700 rpm. Outer ring is stationery. Load is smooth, 8 hours/day for a life of 17000 hours. (a) Select a deep groove ball bearing. (b) What is the rated 90% life of the selected bearing? (c) For b= 1.34 compute the probability of the selected bearing surviving 17000 hours.
7. (a) Select a suitable deep groove ball bearing for supporting a radial load of 10 kN and an axial load of 3 kN for a life of 4000 hrs at 800 rpm. Select from series 63. Calculate the expected life of the selected bearing.
(b) A journal bearing 150 mm diameter and 300 mm long carries a radial load of 9 kN at 1200 rpm. The diametral clearance is 0.075 mm. If 6 kW is being lost in friction, what is the viscosity of the oil used at given operating temperature?
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2. Define coefficient of steadiness.
3. What is meant by journal bearing?
4. Classify the types of bearings.
5. What is meant by life of anti-friction bearings?
6. What are the essential requirements in an end face seal?
7. State the merits of hydrostatic bearings.
8. Differentiate sliding contact and rolling contact bearings.
9. What is the illumination of McKee’s equation?
10. Distinguish between hydrostatic and hydrodynamic bearings.
11. Explain the term Dynamic load carrying capacities of rolling contact bearing.
Part - B
1. Design a journal bearing for a centrifugal pump with the following data: Diameter of the journal =150mm. Load on bearing=40KN, Speed of journal=900 rpm.
2. Select a bearing for a 40 mm diameter shaft rotates at 400 rpm. Due to bevel gear mounted on the shaft, the bearing will have to withstand a 5000N radial and a 3000N thrust load. The life of the bearing expected to be at least 1000 hrs.
3. A Single row deep groove ball bearing operating at 2000 rpm is acted by a 10 KN radial load and 8 KN thrust load. The bearing is subjected to a light shock load and the outer ring is rotating. Determine the rating life of the bearing.
4. Design a journal bearing for a centrifugal pump for the following data: Load on the journal =2000N; Speed of the journal=900 rpm; Type of oil is SAE 10, for which the absolute viscosity at C =0.17 N/m-s; Ambient temperature of oil=C, Maximum bearing pressure for the pump=1.5 N/.Calculate also mass of lubricating oil required for artificial cooling, if rise of temperature of oil be limited to C. Heat dissipation coefficient=1232W//oC.
5. A single row deep grove ball bearing is subjected to a radial force of 8 kN and a thrust force of 3kN. The shaft rotates at 1200 rpm. The expected life of the bearing of the shaft is 75mm. Select a suitable ball bearing for this application.
6. The radial reaction on a bearing is 8000N. It also carries a thrust of 5000N. The shaft diameter is 140mm and it rotates at 1700 rpm. Outer ring is stationery. Load is smooth, 8 hours/day for a life of 17000 hours. (a) Select a deep groove ball bearing. (b) What is the rated 90% life of the selected bearing? (c) For b= 1.34 compute the probability of the selected bearing surviving 17000 hours.
7. (a) Select a suitable deep groove ball bearing for supporting a radial load of 10 kN and an axial load of 3 kN for a life of 4000 hrs at 800 rpm. Select from series 63. Calculate the expected life of the selected bearing.
(b) A journal bearing 150 mm diameter and 300 mm long carries a radial load of 9 kN at 1200 rpm. The diametral clearance is 0.075 mm. If 6 kW is being lost in friction, what is the viscosity of the oil used at given operating temperature?
Click: DME previous 5 years Anna University Questions
For all units of design and machine elements and other mechanical engineering subjects study materials is uploaded see right side of the page you can download whatever materials you need to study or copy and paste the following link :annaunivstudymaterials.blogspot.com
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