Appropriate instrument to check the flatness of slip gage is

In $$NC$$ part programming spindle speed of $$730rpm$$ will be coded by the magic - $$3$$ rule as

The following data is available for machining a component on a turret or center lathe: find out the total number of components to be machined to justify the use of turret lathe

Minimum dimensional and form accuracy can be obtained in the cylinder bores of automobile engines if the bores are finished by