Machine Design
Deep groove ball bearings are used for

Radial load at high speed
Heavy thrust load only
Small angular displacement of shafts
Combined thrust and radial loads at high speed

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Machine Design
A woodruff key is

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

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Machine Design
Stress concentration is caused due to

All of these
Pitting at points or areas at which loads on a member are applied
Abrupt change of section
Variation in properties of material from point to point in a member

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