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.Management Sciences
Category: Engineering Materials
Pick up wrong statement about wrought iron ?
A. It contains carbon of the order of 0 to 0.25%
B. It melts at 1535°C
C. It is very soft and ductile
D. It can be easily forge welded
E. It is made by adding suitable percent¬age of carbon to molten iron and subjecting the product to repeated hammering and rolling
Ferromagnetic alpha iron exists in temperature range of________________?
A. below 723°C
B. 770 – 910°C
C. 910-1440°C
D. 1400-1539°C
E. above 1539°C
A material is known as allotropic or polymorphic if it __________________?
A. has a fixed structure under all conditions
B. exists in several crystal forms at different temperatures
C. responds to heat treatment
D. has its atoms distributed in a random pattern
E. none of the above
Railway rails are normally made of_______________?
A. mild steel
B. alloy steel
C. high carbon
D. tungsten steel
E. cast iron steel
In grey cast iron, carbon is present in the form of____________________?
A. cementite
B. free carbon
C. flakes
D. spheroids
E. nodular aggregates of graphite
Materials after cold working are subjected to following process to relieve stresses__________________?
A. hot working
B. tempering
C. normalising
D. annealing
E. special heat treatment
Pig iron is the name given to________________?
A. raw material for blast furnace
B. product of blast furnace made by reduction of iron ore
C. iron containing huge quantities of carbon
D. iron in molten form in the ladles
E. iron scrap
‘Killed steels’ are those steels__________________?
A. which are destroyed by burning
B. which after their destruction are recycled to produce fresh steel
C. which are deoxidised in the ladle with silicon and aluminium
D. in which carbon is completely burnt
E. which have poor properties due to improper manufacturing
German silver is an alloy of___________________?
A. silver and some impurities
B. refined silver
C. nickel, copper and zinc
D. nickel and copper
E. silver and gold
German silver contains_________________?
A. 1% silver
B. 2.5% silver
C. 5% silver
D. 10% silver
E. 100% silver
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