Machine Design
When bevel gears connect two shafts whose axes intersect at an angle greater than a right angle and one of the bevel gears has a pitch angle of 90°, then they are known as

Internal bevel gears
Crown bevel gears
Angular bevel gears
Mitre gears

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Machine Design
In an oil lubricated journal bearing, the coefficient of friction between the journal and the bearing

Remains constant at all speeds
Is minimum at zero speed and increases monotonically with increase in speed
Becomes minimum at an optimum speed and then increases with further increase in speed
Is maximum at zero speed and decreases monotonically with increase in speed

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