01.Iron ore is, usually, found in the form of
A: oxides
B: carbonates
C: sulphides
D: all of these.
B: carbonates
C: sulphides
D: all of these.
02.Blast furnace is used to produce
pig iron.
03.Smelting is the process of
reducing the ore with carbon in the presence of a flux.
04.The fuel used in a blast furnace is
coke.
05.The gray cast iron has ____
high thermal conductivity.
06.Silicon in cast iron
makes the iron soft and easily machinable.
07.Chilled cast iron is produced
by quick cooling of molten cast iron.
08.Which of the following impurity in cast iron makes it hard and brittle ?
Sulphur.
09.In acidic Bessemer process, the furnace is lined with
silica bricks.
silica bricks.
10.Duplex process of steel making is a combination of
acid Bessemer and basic open hearth processes.
11.A steel containing 16 to 18% chromium and about 0.12% carbon is called
ferritic stainless steel.
12.Pure iron is the structure of
ferrite.
13.The percentage of carbon in pig iron varies from
4 to 4.5%.
14.Pig iron is the name given to
product of blast furnace made by reduction of iron ore.
15.Sulphur in pig iron tends to make it
malleable.
16.'Killed steels' are those steels
which are doxidised in the ladle with silicon and aluminium.
which are doxidised in the ladle with silicon and aluminium.
17.Eutectoid steel contains following percentage of carbon
0.8%.
18.Basic constituents of Monel metal are
nickel, copper.
19.German silver is an alloy of
nickel, copper and zinc.
20.Solder is an alloy consisting of
tin and copper.
21.Cyaniding is the process of
adding carbon and nitrogen by heat treatment of steel to increase its surface hardness.
22.Carbon in iron is an example of
interstitial solid solution.
23.Amorphous material is one
in which there is no definite atomic structure and atoms exist in a random pattern just as in a liquid.
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