792. Titanium carbide coated tools
A.Require frequent regrindings
B.Require a few regrindings
C.Require regrinding according to equipment
D.Require no regrinding
793. Tolerances on commonly used twist drill diameters are held quite close, averaging
A.+0.02 mm, –0.02 mm
B.+0, -0.02 mm
C.0.0 mm, -0 mm
D.+0.002 mm, -0.002 mm
794. Drill diameter is measured over the
A.Main body
B.Plain shank portion
C.Margins at the drill point
D.Heel
795. Point angle of 90° on drills is used for
A.All general applications on mild steel
B.Bakelite, hard rubber and fibrous plastics
C.Hard steels and nickel alloys
D.Thin sheet metal
796. An oversize hole will be produced in drilling, if
A.Feed rate is very high
B.Cutting speed is too low
C.Lips of drill are of unequal length
D.Unsufficient coolant is used
797. The most widely used material for drill, taps and reamers is
A.Low alloy carbon steel
B.High speed steel
C.Carbon steel
D.Cemented carbide
798. Choose the correct statement for: A twist drill produces a hole of
A.Fine finish
B.Exactly round
C.Accurate size
D.None of the above
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