The ability of a material to resist fracture due to high impact loads, is called
Strength
Stiffness
Toughness
Brittleness
Correct Answer :
C. Toughness
Related Questions
In grey cast iron, carbon is present in the form of
Cementite
Free carbon
Flakes
Spheroids
The blade of a power saw is made of
Boron steel
High speed steel
Stainless steel
Malleable cast iron
Melting point of iron is
1539°C
1601°C
1489°C
1712°C
Which of the following is used for bearing liner?
Gun metal
Bronze
Bell metal
Babbitt metal
Connecting rod is, usually, made from
Low carbon steel
High carbon steel
Medium carbon steel
High speed steel
Which of the following material has maximum ductility?
Mild steel
Copper
Nickel
Aluminium
Macrostructure of a material is, generally, examined by
Naked eye
Optical microscope
Metallurgical microscope
X-ray techniques
Cartridge brass can be
Cold rolled into sheets
Drawn into wires
Formed into tube
Any one of these
Beryllium bronze has
High yield point
High fatigue limit
Both (A) and (B)
None of these
The temperature required for full annealing in hypereutectoid steel is
30°C to 50°C above upper critical temperature
30°C to 50°C below upper critical temperature
30°C to 50°C above lower critical temperature
30°C to 50°C below lower critical temperature
Sulphur in cast iron
Makes the iron soft and easily machinable
Increases hardness and brittleness
Make the iron white and hard
Aids fusibility and fluidity
The cupola is used to manufacture
Pig iron
Cast iron
Wrought iron
Steel
A material is said to be allotropic, if it has
Fixed structure at all temperatures
Atoms distributed in random pattern
Different crystal structures at different temperatures
Any one of the above
The tensile strength of wrought iron is maximum
Along the lines of slag distribution
Perpendicular to lines of slag distribution
Uniform in all directions
None of the above
Blast furnace is used to produce
Pig iron
Cast iron
Wrought iron
Steel
Which of the following impurity in cast iron makes it hard and brittle?
Silicon
Sulphur
Manganese
Phosphorus
Which of the following constituents of steels is softest and least strong?
Austenite
Pearlite
Ferrite
Cementite
Which one of the following metals would work-harden more quickly than the others?
Copper
Brass
Lead
Silver
Which of the following impurity in cast iron promotes graphite nodule formation and increases the fluidity of the molten metal?
Silicon
Sulphur
Manganese
Phosphorus
Which is false statement about case hardening? Case hardening is done by
Electroplating
Cyaniding
Induction hardening
Nitriding
The molecules in a solid move
In a random manner
In a haphazard way
In circular motion
Back and forth like tiny pendulums
Recrystallisation temperature is one
At which crystals first start forming from molten metal when it is cooled
At which new spherical crystals first begin to form from the old deformed one when a strained metal is heated
At which change of allotropic form takes place
At which crystals grow bigger in size
White cast iron has
Carbon in the form of carbide
Low tensile strength
High compressive strength
All of these
Ductile 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 creium) in the ladle. Graphite is in nodular or spheroidal form and is well dispersed throughout the material
Lead is poured into the joint between two pipes. These pipes may be made of
Cast iron
Vitrified clay
Asbestos cement
Concrete
The aluminium alloy, mainly used, for anodized utensil manufacture, is
Duralumin
Y-alloy
Magnalium
Hindalium
Bronze is an alloy of
Copper and zinc
Copper and tin
Copper, tin and zinc
None of these
Dislocations in materials refer to the following type of defect
Point defect
Line defect
Plane defect
Volumetric defect
'Killed steels' are those steels
Which are destroyed by burning
Which after their destruction are recycled to produce fresh steel
Which are deoxidised in the ladle with silicon and aluminium
In which carbon is completely burnt
Drop forging dies contain carbon of the order of
0.1 to 0.2 %
0.25 to 0.5 %
0.6 to 0.7 %
0.7 to 0.9 %