Machine Design
The centrifugal tension in belts

Increases the belt tension without increasing power transmission
Increases the power transmitted
Increase the wrap angle
Decreases the power transmitted

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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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Machine Design
A bolt of M 24 × 2 means that

The effective diameter of bolt is 24 mm and there are 2 threads per cm
Cross-sectional area of the threads is 24 mm²
The pitch of the thread is 24 mm and depth is 2 mm
The nominal diameter of bolt is 24 mm and pitch is 2 mm

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Machine Design
Slenderness ratio is the ratio of

Effective length of column to width of column
Effective length of column to least radius of gyration of the column
Maximum size of column to minimum size of column
Width of column to depth of column

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