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Machine Design

Machine Design
The wear load should be __________ the dynamic load.

Greater than
Equal to
Less than
None of these

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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)

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

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Machine Design
A riveted joint is a __________ fastening.

Temporary
Permanent
None of these
Either A or B

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

Shot peening
Polishing
Coating
Electroplating

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Machine Design
The pitch diameter is the __________ diameter of an external or internal screw thread.

Smallest
Effective
None of these
Largest

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Machine Design
Which of the following material has the maximum ductility?

Copper
Aluminium
Zinc
Mild steel

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