Machine Design
Stress concentration is caused due to

Pitting at points or areas at which loads on a member are applied
Variation in properties of material from point to point in a member
All of these
Abrupt change of section

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Machine Design
When the speed of belt increases,

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

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Machine Design
Cap screws are

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

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