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Machine Design

Machine Design
A screw is specified by its

Major diameter
Minor diameter
Pitch
Pitch diameter

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Machine Design
The connecting rod bolts are tightened up so that tightening stress

Is 50% of yield point
Is about yield point divided by safety factor
Is just sufficient to hold parts together
Approaches yield point

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Machine Design
When the fulcrum is in between the load and effort, the lever is said to be of

Third type
Any one of these
Second type
First type

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Machine Design
The ratio of endurance limit in shear to the endurance limit in flexure is

0.4
0.55
0.5
0.33

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Machine Design
In levers, leverage is the ratio of

Mechanical advantage to the velocity ratio
Load arm to the effort arm
Load lifted to the effort applied
Effort arm to the load arm

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Machine Design
The backlash for spur gears depends upon

Pitch line velocity
Both module and pitch line velocity
Module
Tooth profile

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