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A tapered key which fits in a key way in the hub and is flat on the shaft, is known as
The usual proportion for the width of key is (where d = Diameter of shaft or diameter of hole in the hub)
London is the hub of arts and culture. Here 'hub' refers to a place -
The radius of a friction circle for a shaft rotating inside a bearing is (where r = Radius of shaft and $$\tan \varphi $$  = Coefficient of friction between the shaft and bearing)