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Design of Mechanical Systems
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Design of Mechanical Systems
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25 Questions

1. Diameter range is high in geometric progression due to _________ spindle speed.
2. Due to which effect, compressive residual stress of strain-hardening model is smaller than elastic-perfectly plastic model?
3. Which of the following is a property of bulk load?
4. A cylinder made of plain carbon steel has inner diameter 100 mm. What is the thickness of cylinder if maximum internal pressure of 20 Mpa acts on it? ( σall = 100 N/mm2 & poisson’s ratio = 0.3)
5. Economic cutting speed is minimum if geometric ratio is _________
6. Which of the following ergonomic factors are encountered in engineering applications?
7. Why is autofrettage process used in pressure vessels?
8. Class 3 pressure vessels having welded joints are __________
9. Mass capacity of a conveyor is 200 ton/hr, if speed of the belt is 4 m/s then what is the width of horizontal flat belt conveyor carrying the load? (Surcharge factor = 0.075 & ρ = 1000 kg/m3)
10. Which of the following statements is false for troughed belt conveyors? 1. Troughed belt conveyors use flexible belts 2. They contain five idlers 3. Depth of trough decreases with increasing number of idlers 4. Flexibility of belt increases as depth of trough decreases
11. Which type of welded joints are not included in class 3 pressure vessels?
12. Which of the following belt conveyors have low volume carrying capacity?
13. In forging process, forging plane is the plane __________
14. If a relief valve has reliability of 0.989, how many failures are expected in testing 1000 such relief valves?
15. Which of the following principle recognizes human capabilities and limitations using design effective handling equipment?
16. What is the function of gudgeon pin?
17. A piston made of gray cast iron has piston head thickness of 20 mm. What will be thickness of piston barrel under piston rings if it has allowable tensile stress of 30 N/mm2? ( Bore diameter = 50 mm & Pmax =15 N/mm2)
18. Which of the following statements is/are true about safety/risk?
19. The limit equation st = Sut / Nf is expressed as _________
20. Which of the following statements is/are false if separate cylinder liner is pressed inside the cylinder of large engines?
21. What is meant by hazard rate?
22. Internal pressure of 2.5 Mpa acts on a pressure vessel of thickness 15 mm and internal diameter of 1500 mm. What is the stress induced in longitudinal direction?
23. Selection of welding process does not depend on ___________
24. Maximum and minimum diameter of a shaft to be machined is 100 mm and 80 mm respectively. What is the maximum spindle speed if cutting velocity is 40 m/min?
25. Which of the following parameters are to be considered for parts with non rotational symmetry in machining process?

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