638. In helical milling, the ratio of the circumference of the gear blank to the lead of the helix gives the
A.Angle setting of the machine table
B.Proper speed to use
C.Proper feed and depth of cut required
D.No. of teeth to be cut
639. The accurate spacing of teeth in a gear blank requires the use of
A.A dividing head
B.An index plate
C.A gear tooth vernier
D.A differential mechanism
640. Helical gears can be cut on following type of milling machine
A.Vertical
B.Horizontal
C.Universal
D.Drum-type
641. Feed rate in milling operation is expressed as
A.Mm/tooth
B.Mm/r.p.m. of the milling cutter
C.Metres/minute
D.Revolution per minute
642. Milling cutters are mounted on a part called the
A.Bracket or brace
B.Arbor
C.Shaft
D.Dividing head
643. The angle between the face of the blade and a line passing through the nose parallel to the milling cutter axis is called
A.Axial rake
B.Radial rake
C.Relief angle
D.Clearance angle
644. Negative rake is usually provided on
A.H.S.S. tools
B.High carbon steel tools
C.Cemented carbide tools
D.All of the above
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