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Machine Design

Machine Design
Ball bearing type screws are found in following application

Aeroplane engines
Steering mechanism
Crane
Screw jack

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Machine Design
The ultimate strength of steel in tension in comparison to shear is in the ratio of

0.042361111111111
0.084027777777778
0.12638888888889
0.085416666666667

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Machine Design
Aircraft body is usually fabricated by

Pre-casting
Welding
Casting
Riveting

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Machine Design
A transmission shaft includes

Counter shaft
Line shaft
Over head shaft
All of these

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Machine Design
According to Indian standards, total numbers of tolerance grades are

12
20
18
8

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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/4σt
pd/2σt
pd/σt
pd/3σt

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