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Machine Design

Machine Design
The minimum number of teeth on the pinion which will mesh with any gear without interference for 20° full depth involute teeth will be

12
18
14
24

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Machine Design
When a material is subjected to fatigue loading, the ratio of the endurance limit to the ultimate tensile strength is

0.65
0.35
0.2
0.5

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Machine Design
A closely coiled helical spring is acted upon by an axial force. The maximum shear stress developed in the spring is τ. The half of the length of the spring if cut off and the remaining spring is acted upon by the same axial force. The maximum shear stress in the spring in new condition will be

τ
τ/2
2 τ
4 τ

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Machine Design
The endurance limit of a material with finished surface in comparison to rough surface is

More or less depending on quantum of load
Same
Less
More

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Machine Design
The railway carriage couplings have

Buttress threads
Square threads
Knuckle threads
Acme threads

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

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