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

Teeth of internal spur gears can be accurately cut in a

In twist drills ......... (small/large) point angle and ........ (small/large) helix angle are provided for drilling soft, low strength steel.

The standard specification of a grinding wheel is $$A-46-M-6-V-21.$$ It means a wheel of