Thrust force in drilling can be reduced by .................A............... the point angle and by ..........B.......... the helix angle of the drill

(a) increasing / reducing
(b) increasing / reducing

In comparison to $$HSS$$, super $$HSS$$ contains higher percentage of

$$BUE$$ formation ......A... the cutting force and ......B...... the surface finish

(a) decreases/ increases
(b) spoils / improves

In $$HSS,$$ the tungsten can be substituted by