Melting point of iron is
1539°C
1601°C
1489°C
1712°C
Correct Answer :
A. 1539°C
Related Questions
The unique property of cast iron is its high
Malleability
Ductility
Surface finish
Damping characteristics
Which of the following is used for bearing liner?
Gun metal
Bronze
Bell metal
Babbitt metal
Which of the following display properties similar to that of steel?
Blackheart cast iron
White-heart cast iron
Both (A) and (B)
None of these
The aluminium alloy, mainly used, for anodized utensil manufacture, is
Duralumin
Y-alloy
Magnalium
Hindalium
Compressive strength of grey cast iron in tonnes/cm is of the order of
35
57
710
1015
The coordination number of a face centred cubic space lattice is
Six
Twelve
Eighteen
Twenty
Steel made from phosphate iron is
Brittle
Hard
Ductile
Tough
Dye penetrant method is generally used to locate
Core defects
Surface defects
Superficial defects
Temporary defects
Malleable cast iron is produced
By adding magnesium to molten cast iron
By quick cooling of molten cast iron
From white cast iron by annealing process
None of these
Which of the following property is desirable for materials used in tools and machines?
Elasticity
Plasticity
Ductility
Malleability
The lower critical temperature
Decreases as the carbon content in steel increases
Increases as the carbon content in steel increases
Is same for all steels
Depends upon the rate of heating
Aluminium bronze contains
94% aluminium, 4% copper and 0.5% Mn, Mg, Si and Fe
92.5% aluminium, 4% copper, 2% nickel, and 1.5% Mg
10% aluminium and 90% copper
90% magnesium and 9% aluminium with some copper
Which of the following constituents of steels is softest and least strong?
Austenite
Pearlite
Ferrite
Cementite
The cupola is used to manufacture
Pig iron
Cast iron
Wrought iron
Steel
Eutectoid steel contains following percentage of carbon
0.02 %
0.3 %
0.63 %
0.8 %
In low carbon steels, presence of small quantities of sulphur improves
Weldability
Formability
Machinability
Hardenability
The type of space lattice found in alpha-iron is
Face centred cubic space lattice
Body centred cubic space lattice
Close packed hexagonal space lattice
None of these
Railway rails are normally made of
Mild steel
Alloy steel
High carbon
Tungsten steel
Pearlite is a combination of
Ferrite and cementite
Cementite and gamma iron
Ferrite and austenite
Ferrite and iron graphite
The alloy, mainly used for corrosion resistance in stainless steels is
Silicon
Manganese
Carbon
Chromium
Eutectoid reaction occurs at
600°C
723°C
1147°C
1493°C
The metal suitable for bearings subjected to light loads, is
Silicon bronze
White metal
Monel metal
Phosphor bronze
Argentite is the principal ore or raw material for
Aluminium
Tin
Zinc
Silver
Which is false statement about tempering? Tempering is done to
Improve machinability
Improve ductility
Improve toughness
Release stresses
Foundry crucible is made of
Mild steel
German silver
Lead
Graphite
Addition of manganese to aluminium results in
Improvement of casting characteristics
Improvement of corrosion resistance
One of the best known age and precipitation hardening systems
Improving machinability
Which of the following iron exist between 910°C and 1403°C?
α-iron
β-iron
γ-iron
δ-iron
Macrostructure of a material is, generally, examined by
Naked eye
Optical microscope
Metallurgical microscope
X-ray techniques
Which of the following material has nearly zero coefficient of expansion?
Stainless steel
High speed steel
Invar
Heat resisting steel
Malleable cast iron
Contains 1.7 to 3.5% carbon in Free State and is obtained by the slow cooling of molten cast iron
Is also known as chilled cast iron and is obtained by cooling rapidly. It is almost unmachinable
Is produced by annealing process. It is soft, tough, and easily machined metal
Is produced by small additions of magnesium (or cerium) in the ladle. Graphite is in the nodular or spheroidal form and is well dispersed throughout the material