414. Which of the following is/are affected by the number of teeth a saw blade has
A.Rate of feed
B.Coarseness of cut
C.Size of cut
D.All of the above
415. Sheradising is
A.A zinc diffusion process
B.An oxidising process used for aluminium and magnesium articles
C.A process used for making thin phosphate coatings on steel to act as base or primer for enamels and paints
D.The process of coating of zinc by hot dipping
416. A good lubricant for thread-cutting-operation is
A.Graphite
B.White lead
C.Mineral lard oil
D.Water soluble oil
417. The power is transmitted by lead screw to the carriage through
A.Gear box
B.Worm and gear
C.Rack and pinion
D.Half nut
418. No lubricant is required when cutting threads in
A.Tungsten carbide
B.Mild steel
C.Titanium
D.Brass or cast iron
419. The following type of file is preferred for filing brass or bronze
A.The smooth-cut file
B.The second-cut file
C.The coarse-cut or rough-cut file
D.The double-cut file
420. To clean a file, it is
A.Dipped in water
B.Cleaned with a file card
C.Rubbed on stone
D.Rubbed on wood
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