Machine Design
Cold working

Decreases the fatigue strength
Alone has no influence on fatigue strength
Has no influence on fatigue strength
Increases the fatigue strength

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Machine Design
For same pulley diameters, center distance, belt speed and belt and pulley materials,

Open belt drive transmits more power than crossed belt drive
Open and crossed belt drives transmit same power
Power transmission does not depend upon open and crossed types of constructions
Crossed belt drive transmits more power than open belt drive

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Machine Design
In worm, gears, pitch lead angle is

The angle between the tangent to the pitch helix and an element of the cylinder
None of these
Half the angle between two inclined faces in axial plane
The angle between the tangent to the pitch helix and the plane of rotation

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