Explanation: Rubber bond grinding wheel is generally used for machining of soft work piece. Fifth place of ISO designation of grinding wheel represents type of bond.

Explanation: In soft grinding wheels, during machining of hard work piece glazing will occur after long time.

Explanation: In hard grinding wheels, during machining of soft work piece glazing will occur after long time and grains of grinding wheel will be effectively utilized before coming out from the wheel.

Explanation: In dense structure grinding wheels, during machining of hard work piece material removal rate is small and also wheel has good strength.

Explanation: In open structure grinding wheels, during machining of soft work piece material removal rate is large and space for chip flow is also large due to more space between grains of wheel.

Explanation: Material removal rate in grinding process is very small. Hence grinding is mostly use as a finishing process. Only small portion of abrasives are involved in grinding process and hence has less material removal rate.

Explanation: Grinding wheel have negative rake angle and hence have very small material removal rate. Hence grinding is mostly use as a finishing process.

Explanation: Only small portion of abrasives are involved in grinding process and hence has less material removal rate. Hence grinding is mostly use as a finishing process.

Explanation: Due to the increase in temperature during grinding operation some material get welded again with the chip.

Explanation: Grinding ratio = (volume of material removed/volume of wheel wear). G.R is generally between 0.5-10.