225. Wrought iron is used for
A. structural works in beams
B. small sized water pipes
C. columns and struts
D. none to these.
226. Cast iron is used for
A. structural works in beams
B. small sized water pipes
C. columns and struts
D. none to these.
227. Pick up the correct statement from the following :
A. Rust is due to formation of oxides
B. Cast iron oxidises less
C. Steel oxidises most
D. All the above.
228. Galvanising means covering iron with a thin coat of
A. tin
B. zinc
C. glaze
D. coal tar.
229. Magnese steels
A. are non-magnetic
B. possess high electrical resistance
C. possess low coefficient of expansion
D. all the above.
230. For the manufacture of stainless steel, steel is mixed with
A. chromium
B. nickel
C. tungsten
D. none of these.
231. The yield strength and tensile strength of low carbon steel may be improved by the addition of
A. manganese
B. chromium
C. nickel
D. vanadium
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