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
The angle between the tangent to the pitch helix and the plane of rotation
Half the angle between two inclined faces in axial plane

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Machine Design
Plastic flow in ductile materials

Depends on other considerations
Increases the seriousness of static loading stress concentration
Has no effect on it
Lessens the seriousness of static loading stress concentration

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Machine Design
When the speed of belt increases,

The power transmitted will increase
The power transmitted will decrease
The coefficient of friction between the belt and pulley increases
The coefficient of friction between the belt and pulley decreases

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Machine Design
The contact ratio is the ratio of

Length of path of contact to the circular pitch
Length of arc of recess to the circular pitch
Length of arc of approach to the circular pitch
Length of arc of contact to the circular pitch

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