In metal cutting with a carbide tool, at the maximum recommended speed, the largest $$\% $$ of heat generated goes to the

Increase in rake angle causes ..........A................ in chip thickness and .............B......... in shear angle

(a) increase / reduction
(b) increase / decrease

Amount of energy consumption for unit volume of metal removal is maximum in

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