27. How many grades of natural oil stone available?
(^) Three grades (B) Four grades
(C) Two grades (D) One grades
28. Slips stone used for ——————— surface.
(A) Rough surface (B) Curved surface
(C) Flat surface (D) Smooth surface
29. The toothing plane is used for :
(ಹ) To prepare rough gluing surface (B) Clean and level grooves
(C) To form grooves (D) Planing and smoothing rebates
30. The sharpening angle of cutting iron in plane :
(A) 20%....
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