Machine Design
In nitrated parts, the origins of the fatigue cracks will occur at

Within the core
Just below the surface
Surface
None of these

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Machine Design
When the belt speed increases

Power transmitted increases to a maximum value and then decreases
Power transmitted increases
Power transmitted remains the same
Power transmitted decreases

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Machine Design
A woodruff key is

All of these
Fitted in pairs at right angles
Capable of tilting in a recess milled out in the shaft
A tapered key with head at one end

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