442. Sanding belts are made of cloth, coated with various grades of
A.Sand
B.Gravel
C.Copper oxide
D.Aluminium oxide

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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

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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

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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

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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

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447. The front rake required to machine brass by HSS tool is
A.15°
B.10°
C.5°
D.0°

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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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