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Machine Design

Machine Design
In designing a flange coupling, the pitch circle diameter of bolts is taken as (where d = Diameter of the shaft)

2 d
3 d
4 d
5 d

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

90°
75°
60°
45°

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Machine Design
If the centre distance of the mating gears having involute teeth is varied within limits, the velocity ratio

None of these
Remains unchanged
Increases
Decreases

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Machine Design
According to I.B.R., the distance between the rows of rivets, for equal number of rivets in more than one row for lap joint or butt joint (chain riveting) shall not be less than

2 d
2.5 d
d
1.5 d

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Machine Design
When a close coiled helical spring is compressed, its wire is subjected to

Compression
Tension
All of these
Shear

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Machine Design
In worm gears, the pressure angle is __________ the angle between two inclined faces in axial plane.

Thrice
Twice
Half
None of these

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