442. Sanding belts are made of cloth, coated with various grades of
A.Sand
B.Gravel
C.Copper oxide
D.Aluminium oxide
443. The metal in machining operation is removed by
A.Tearing chips
B.Distortion in metal
C.Shearing the metal across a zone
D.Cutting the metal across a zone
444. Average cutting speed in machining cast iron by a single point cutting tool of H.S.S. is
A.6 m/min
B.11 m/min
C.22 m/min
D.33 m/min
445. Galvanising 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 a base or primer for enamels and paints
D.Is the process of coating of zinc by hot dipping
446. The C.L.A. value is used for measurement of
A.Metal hardness
B.Surface roughness
C.Surface dimensions
D.Sharpness of tool edge
447. The front rake required to machine brass by HSS tool is
A.15°
B.10°
C.5°
D.0°
448. The best all-round coolant for carbide tools is
A.Soluble oil in plenty
B.Kerosene
C.Turpentine oil
D.Compressed air
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