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Machine Design

Machine Design
Screws used for power transmission should have

Very fine threads
High efficiency
Strong teeth
Low efficiency

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Machine Design
The application of third type levers is found in

A pair of tongs
Handle of a hand pump
Hand wheel of a punching press
Lever of a loaded safety valve

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Machine Design
The distribution of the forces along the length of key fitted in a shaft

Varies exponentially, being more near the torque-input end
Varies linearly
Varies exponentially, being less near the torque-input end
Is uniform throughout

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Machine Design
A column is known as a long column if the slenderness ratio is

40
70
100
50

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Machine Design
In case of pressure vessels having open ends, the fluid pressure induces

None of these
Longitudinal stress
Circumferential stress
Shear stress

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

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

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