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Machine Design

Machine Design
Two shafts of the same length and material are joined in series. If the ratio of their diameters is 2, then the ratio of their angles of twist will be

4
16
2
8

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Machine Design
For steel, the ultimate strength in shear as compared to ultimate strength in tension is

43834
43833
43864
43832

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Machine Design
If the size of a standard specimen for a fatigue testing machine is increased, the endurance limit for the material will

Have same value as that of standard specimen
None of these
Decrease
Increase

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Machine Design
Lewis form factor for 14½° composite and full depth involute system is (where T = Number of teeth)

0.175 - (0.841/T)
0.124 - (0.684/T)
0.154 - (0.912/T)
None of these

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Machine Design
The building up of worn and undersized parts, subjected to repeated loads by electroplating is

Best method
Has no effect as regards fatigue strength
Cheapest method
Extremely hazardous

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Machine Design
In order to withstand resistance to wear, the best profile of gear is

20° involute stub tooth
14½° stub tooth
20° full depth involute tooth
14½° full depth involute tooth

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