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Machine Design 1: Curve beams and Thick Cylinders
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Machine Design 1: Curve beams and Thick Cylinders
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25 Questions

1. If a hollow steel tube is heated from a temperature of 25’C to 250’C then fid the expansion of tube if area of the cross section is 300mm²,length of tube=200mm and coefficient of thermal expansion is 10.8 x 10⁻⁶ per ⁰C.
2. If for a curved beam of trapezoidal cross section, radius of neutral axis is 89.1816mm and radius of centroidal axis is 100mm, then find the bending stress at inner fibre whose radius is 50mm. Area of cross section of beam is 7200mm² and the beam is loaded with 100kN of load.
3. The breaking stress is ____________ the ultimate stress.
4. Which of the following samples is also known as catch sample?
5. A curved beam with eccentricity 0.02D is loaded with 1kN.Centroidal radius=4D and inner and outer radii are 3.5D and 4.5D respectively. Area of cross section is 0.8D². Find the dimension D if allowable stress is 110N/mm² and considering only direct tensile stress.
6. A curved beam with eccentricity 0.02D is loaded with 1kN.Centroidal radius=4D and inner and outer radii are 3.5D and 4.5D respectively. Area of cross section is 0.8D². Find the dimension D if allowable stress is 110N/mm² and considering combined effect of direct stress and bending stress.
7. E – coli was formerly known as _________
8. What is the desirable limit for sulphates in drinking water?
9. Stress intensity factor is the critical value of stress at which crack extension occurs.
10. A curved beam with eccentricity 0.02D is loaded with 1kN.Centroidal radius=4D and inner and outer radii are 3.5D and 4.5D respectively. Area of cross section is 0.8D². Find the dimension D if allowable stress is 110N/mm².Considering only bending stress.
11. _______ is as the maximum energy that can be absorbed within the proportionality limit.
12. Membrane filter technique is used for testing?
13. The odour of water can be determined by _________
14. How many modes are there for crack propagation?
15. High turbidity of water can be determined by __________
16. A curved beam has neutral axis is curved while loaded and straight when unloaded.
17. The ductility of a material is __________ to the increase in percentage reduction in an area.
18. ______ sample collected at an instant particularly.
19. Residual stresses are always added in the load stresses and hence are always harmful.
20. The colour of water is expressed in terms of ________
21. The critical value at which crack extension occurs is called
22. The tensile test is carried on ________ material.
23. If fluoride concentration in drinking water increases to more than ______ ppm, it causes fluorosis.
24. All type of stresses vanishes after as soon as the applied load is removed.
25. The maximum permissible total solid content in water for domestic purposes should not exceed.

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