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Machine Design

Machine Design
The helix angle for double helical gears may be made up to

90°
45°
60°
75°

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Machine Design
The included angle for the British Association thread is

29°
55°
47.3°
60°

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Machine Design
If a shaft made from ductile material is subjected to combined bending and twisting moment, calculations based on which one of the following failure theories will give the most conservative value?

Maximum principal stress theory
Maximum distortion energy theory
Maximum strain energy theory
Maximum shear stress theory

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Machine Design
In a transverse fillet welded joint, the size of weld is __________ the throat of weld.

0.5 times
2 times
Double
Equal to

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Machine Design
A riveted joint is a __________ fastening.

None of these
Permanent
Either A or B
Temporary

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Machine Design
If the centre distance of the mating gears having involute teeth is increased, then the pressure angle

Decreases
None of these
Increases
Remains unchanged

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