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16 . If the furnace is provided with insufficient fuel at low temperatures, the type of pig iron produced, is called
A. Bessemer pig
B. Grey or foundry pig
C. White or forge pig
D. Mottled pig.

17 . Stainless steel contains
A. 18% of chromuim and 8% nickel
B. 8% of chromium and 18% of nickel
C. 12% of chromium and 36% of nickel
D. 36% of chromium and 12% of nickel.

18 . Pick up the hypabyssal rock from the following:
A. Granite
B. Dolerite
C. Basalt
D. All the above.

19 . Depending on the chemical composition and mechanical properties, iron may be classified as
A. cast iron
B. wrought iron
C. steel
D. all the above.

20 . In case of Raymond pile
A. lengths vary from 6 m to 12 m
B. diameter of top of piles varies from 40 cm to 60 cm
C. diameter of pile at bottom varies from 20 cm to 28 cm
D. all the above.