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Machine Design

Machine Design
The most important dimension in the design of a nut is

Pitch diameter
Outside diameter
Height
Inside diameter

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Machine Design
Tensile strength of a mild steel specimen can be roughly predicted from following hardness test

None of these
Vickers
Rockwell
Brinell

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Machine Design
The efficiency of a square threaded screw is maximum if the helix angle is equal to(Where φ = Angle of friction)

45° + φ/2
45° - φ
45° - φ/2
90° - φ

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Machine Design
According to I.B.R., shearing resistance required to shear off the rivet per pitch length (in double shear) is (where n = Number of rivets per pitch length)

1.875 × (π/4) d² × τ × n
2 × (π/4) d² × τ × n
(π/4) d² × τ × n
3 × (π/4) d² × τ × n

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Machine Design
In the levers of first type, the mechanical advantage is ________ one.

More than
Equal to
Less than
None of these

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Machine Design
A riveted joint is a __________ fastening.

Either A or B
None of these
Permanent
Temporary

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