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Machine Design

Machine Design
The crest diameter of a screw thread is same as

Major diameter
Minor diameter
Core diameter
Pitch diameter

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Machine Design
A bench vice has following type of threads

Acme
Metric
Buttress
Square

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Machine Design
For standard coarse threads of nut, the threads will be as strong in failure by shear as the bolt in tension, if the height of nut (h) is approximately

0.8 times
0.4 times
0.6 times
0.7 times

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Machine Design
A thin spherical shell of internal diameter d is subjected to an internal pressure p. If σt is the tensile stress for the shell material, then thickness of shell is equal to

pd/2σt
pd/3σt
pd/4σt
pd/σt

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Machine Design
When the material of key and shaft is same, and the width of key is one-fourth of the diameter of shaft (d), then length of key will be

1.2 d
1.57 d
0.8 d
1.8 d

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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/2
4 τ
2 τ
τ

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