Machine Design
The value of Lewis form factor used in design of gears is

Dependent on system of teeth
Dependent on number of teeth of a gear
All of these
Independent of size of teeth

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Machine Design
Machine screws are

Used to prevent relative motion between two parts
Slotted for a screw driver and generally used with a nut
Similar to small size tap bolts except that a greater variety of shapes of heads are available
Similar to stud

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Machine Design
The effective stress in wire ropes during normal working is equal to the stress due to

Acceleration/retardation of masses plus stress due to bending
Bending plus stress due to acceleration/retardation
Axial load plus stress due to acceleration/retardation
Axial load plus stress due to bending

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