Machine Design
Which of the following bearing is preferred for oscillating conditions?

Needle roller bearing
Taper roller bearing
Double row roller bearing
Angular contact single row ball bearing

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Machine Design
The ends of the leaves of a semi-elliptical leaf spring are made triangular in order to

Have variable bending moment (M) in each leaf
Permit each leaf to act as an overhanging beam
Make M/I constant throughout the length of the leaf
Obtain variable moment of inertia (I) in each leaf

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