624. Standard milling arbor size is
A.25.4 mm
B.32 mm
C.31.75 mm
D.All of the above

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625. Milling machine is classified as horizontal or vertical type, depending on the position of
A.Spindle
B.Workpiece
C.Milling cutter
D.Work table or bed

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626. Burnishing is an operation of
A.Heat treatment
B.Deep boring
C.Gear finishing
D.Surface treatment

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627. To obtain fine finish cuts in milling
A.The cutting speed should be decreased and the feed increased
B.The cutting speed should be increased and the feed decreased
C.Both the cutting speed and feed should be decreased
D.Both the cutting speed and feed should be increased

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628. The arbor of the milling machine is used to hold
A.Cutting tool
B.Spindle
C.Over arm
D.Mandrel

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629. Very thin chips with end mills
A.Dull the cutting edge quickly
B.Improve tool life
C.Sharpen the cutting edge
D.Cause chipping of the cutting edge cause tool breakage

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630. Plain milling cutters should be
A.Smaller than the width of the flat surface to be machined
B.Wider than the flat surface to be machined
C.Equal to width of flat surface to be machined
D.There is no such criterion

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