Due to continuous use the grinding wheel of an offhand grinder is glazed locally. What tool will you use to rectify these defects?

17) The tooth thickness of a rack is measured by

18) A shaft is turned in one finish cut. Which one of the following parameter will directly influence the machining time?

19) Convert 4/5 into decimal

20) You have to machine a flat surface on a work piece of two meter length. Which machine will you choose for this?