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Machine Design

Machine Design
If the tearing efficiency of a riveted joint is 75%, then the ratio of diameter of rivet to the pitch is equal to

0.5
0.2
0.25
0.6

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Machine Design
In second type of levers,

Effort is in between the fulcrum and load
Load is in between the fulcrum and effort
None of these
Fulcrum is in between the load and effort

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Machine Design
For general industrial machinery, the ratio of the length of journal to its diameter is taken as

1 to 2
5 to 10
0.5 to 1
3 to 5

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Machine Design
When a hole of diameter ‘d’ is punched in a metal of thickness 't', then the force required to punch a hole is equal to (where τu = Ultimate shear strength of the material of the plate)

π/4 × d².τu
πd.t.τu
π/4 × d² × tτu
t.τu

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Machine Design
The centrifugal tension in belts

Increases the power transmitted
Decreases the power transmitted
Increase the wrap angle
Increases the belt tension without increasing power transmission

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Machine Design
The resilience of a bolt may be increased by

Decreasing its length
Increasing its length
Increasing its shank diameter
Decreasing its shank diameter

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