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Machine Design

Machine Design
The lead angle of a worm is 22.5°. Its helix angle will be

90°
45°
67.5°
22.5°

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Machine Design
The strap end of a connecting rod of steam engine is joined by

Sleeve and cotter joint
Knuckle joint
Spigot socket cotter joint
Gib of cotter joint

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Machine Design
In a multiple V-belt drive, when a single belt is damaged, it is preferable to change the complete set in order to

Reduce slip
Ensure proper alignment
Reduce vibration
Ensure uniform loading

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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

0.2
0.65
0.5
0.35

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Machine Design
The included angle for the V-belt is usually

10°-20°
30°-40°
60°-80°
40°-60°

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Machine Design
A screw will be self locking, if

Friction angle is less than helix angle
Friction angle is equal to helix angle
Efficiency of screw is 100%
Friction angle is more than helix angle

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