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Machine Design

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

67.5°
45°
22.5°
90°

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Machine Design
The fatigue life of a part can be improved by

Coating
Electroplating
Shot peening
Polishing

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Machine Design
A riveted joint is a __________ fastening.

None of these
Permanent
Temporary
Either A or B

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Machine Design
For a square key made of mild steel, the shear and crushing strength are related as

Shear strength is greater than crushing strength
Shear strength is less than crushing strength
None of these
Shear strength is equal to crushing strength

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Machine Design
Gears are casted by

Permanent mould casting
Slush casting
Sand mould casting
Centrifugal casting

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

20
12
18
8

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