Machine Design
The anti-friction bearings

Have low starting and low running friction at moderate speeds
Have high initial cost
All of these
Can carry both radial and thrust loads

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Machine Design
In the calculation of induced shear stress in helical springs, the Wahl's stress factor is used to take care of

Combined effect of transverse shear stress and curvature of wire
Combined effect of transverse shear stress and bending stress in the wire
Combined effect of torsional shear stress and transverse shear stress in the wire
Combined effect of bending stress and curvature of the wire

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Machine Design
Castle nut is a locking device in which

A hard fibre or nylon cotter is recessed in the nut and becomes threaded as the nut is screwed on the bolt causing a tight grip
Through slots are made at top and a cotter pin is passed through these and a hole in the bolt, and cotter pin spitted and bent in reverse direction at other end
One smaller nut is tightened over main nut and main nut tightened against smaller one by loosening, creating friction jamming
A slot is cut partly is middle of nut and then slot reduced by tightening a screw

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Machine Design
When the belt is transmitting maximum power,

The tension in tight side is twice the centrifugal tension
The tension in slack side is equal to the centrifugal tension
The tension in tight side is thrice the centrifugal tension
None of these

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