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Machine Design

Machine Design
The centre to centre distance between two consecutive rivets in a row, is called

Pitch
Back pitch
Margin
Diagonal pitch

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Machine Design
The strength of a riveted joint is equal to

Tearing strength of plate (Pt)
Crushing strength of rivet (Pc)
Shearing strength of rivet (Ps)
Least value of Pt Ps and Pc

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Machine Design
A tapered key which fits in a key way in the hub and is flat on the shaft, is known as

Flat saddle key
Wood ruff key
Gib-head key
Feather key

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Machine Design
According to I.B.R., the efficiency of a triple riveted butt joint with double straps of unequal width (5 rivets per pitch length) should be

70 to 83%
45 to 60%
63 to 70%
80 to 90%

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Machine Design
In a marine flange coupling, the pitch circle diameter of bolts is taken as

2 d
2.5 d
1.2 d
1.6 d

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Machine Design
The stiffness of a closely coiled helical spring subjected to an axial load W is equal to (where G = Modulus of rigidity, and n = Number of active coils)

Gd⁴/ 4D3n
Gd3/ 8D3n
Gd⁴/ 8D²n
Gd⁴/ 8D3n

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