Introduction to Grinding Operation

Q. Assertion $\left(A\right)$: Grinding needs higher specific cutting energy than milling.
Reason $\left(R\right)$: Milling cutter material is harder than abrasive grains

1. Both $A$ and $R$ are true and $R$ is the correct explanation of $A$
2. Both $A$ and $R$ are true but $R$ is not a correct explanation of $A$
3. $A$ is true but $R$ is false
4. $A$ is flase but $R$ is true

Q. Among the conventional machining processes, maximum specific energy is consumed in

1. Turning
2. Drilling
3. Planning
4. Grinding