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Q.1
Argentite is the principal ore or raw material for
Aluminium
Tin
Zinc
Silver
Q.2
Melting point of iron is
1539°C
1601°C
1489°C
1712°C
Q.3
The basic constituents of Hastelloy are
Aluminium, copper etc.
Nickel, molybdenum etc.
Nickel, Copper, etc.
All of the above
Q.4
The ultimate tensile strength of low carbon steel by working at a high strain rate will
Decrease
Increase
Remain constant
First increase and then decrease
Q.5
Normalising of steel is done to
Refine the grain structure
Remove strains caused by cold working
Remove dislocations caused in the internal structure due to hot working
All of the above
Q.6
Hardness of steel depends on
Amount of carbon it contains
The shape and distribution of the carbides in iron
Method of fabrication
Contents of alloying elements
Q.7
The coordination number of a face centered cubic space lattice is
Six
Twelve
Eighteen
Twenty
Q.8
The composition of silver solder is
Silver, copper, zinc
Silver, tin, nickel
Silver, lead, zinc
Silver, copper, aluminium
Q.9
The following types of materials are usually the most ductile
Face centered cubic lattice
Body centered cubic lattice
Hexagonal close packed lattice
All of the above
Q.10
Nimonic contains __________ percentage of nickel as that of Inconel.
Same
Less
More
None of these
Q.11
Which one of the following metals would work-harden more quickly than the others?
Copper
Brass
Lead
Silver
Q.12
Sulphur in pig iron tends to make it
Hard
Soft
Ductile
Tough
Q.13
In low carbon steels, presence of small quantities of sulphur improves
Weldability
Formability
Machinability
Hardenability
Q.14
In induction hardening ________ is high.
Current
Voltage
Frequency
Temperature
Q.15
According to Indian standard specifications, SG 400/15 means
Spheroidal graphite cast iron with B.H.N. 400 and minimum tensile strength 15 MPa
Spheroidal graphite cast iron with minimum tensile strength 400 MPa and 15 percent elongation
Spheroidal graphite cast iron with minimum compressive strength 400 MPa and 15 percent reduction in area
None of the above
Q.16
The alloy, mainly used for corrosion resistance in stainless steels is
Silicon
Manganese
Carbon
Chromium
Q.17
The loss of strength in compression with simultaneous gain in strength in tension due to overloading is known as
Hysteresis
Creep
Visco elasticity
Boeschinger effect
Q.18
An alloy of copper, tin and zinc is known as
Brass
Bronze
Gun metal
Muntz metal
Q.19
Paramagnetic alpha iron changes to gamma iron at
770°C
910°C
1440°C
1539°C
Q.20
In basic Bessemer process, the furnace is lined with
Silica bricks
A mixture of tar and burnt dolomite bricks
Both (A) and (B)
None of these
Q.21
Babbitt metal is a
Lead base alloy
Copper base alloy
Tin base alloy
Cadmium base alloy
Q.22
Macrostructure of a material is, generally, examined by
Naked eye
Optical microscope
Metallurgical microscope
X-ray techniques
Q.23
Which of the following iron exist between 910°C and 1403°C?
α-iron
β-iron
γ-iron
δ-iron
Q.24
Structural steel contains following principal alloying elements
Nickel, chromium and manganese
Tungsten, molybdenum and phosphorous
Lead, tin, aluminium
Zinc, sulphur, and chromium
Q.25
The most effective inhibitor of grain growth, when added in small quantities is
Carbon
Vanadium
Manganese
Cobalt
Q.26
Monel metal is an alloy of
Nickel and copper
Nickel and chromium
Nickel, Chromium and iron
Copper and chromium
Q.27
Delta metal is an alloy of
Copper, zinc and iron
Iron, nickel and copper
Iron, lead and tin
Iron, aluminium and magnesium
Q.28
If a refractory contains high content of silicon, it means refractory is
Acidic
Basic
Neutral
Brittle
Q.29
The bond formed by transferring electrons from one atom to another is called
Ionic bond
Covalent bond
Metallic bond
None of these
Q.30
Which of the following constituents of steels is softest and least strong?
Austenite
Pearlite
Ferrite
Cementite
Q.31
Which of the following property is desirable in parts subjected to shock and impact loads?
Strength
Stiffness
Brittleness
Toughness
Q.32
Crystal structure of a material is, generally, examined by
Naked eye
Optical microscope
Metallurgical microscope
X-ray techniques
Q.33
The crystal structure of brass is
F.C.C.
B.C.C.
H.C.P.
Orthorhombic crystalline structure
Q.34
The type of space lattice found in gamma-iron is
Face centered cubic space lattice
Body centered cubic space lattice
Close packed hexagonal space lattice
None of these
Q.35
The type of space lattice found in alpha-iron is
Face centered cubic space lattice
Body centered cubic space lattice
Close packed hexagonal space lattice
None of these
Q.36
A specimen of aluminium metal when observed under microscope shows
B.C.C. crystalline structure
F.C.C. crystal structure
H.C.P. structure
A complex cubic structure
Q.37
The crystal structure of gamma iron is
Body centered cubic
Face centered cubic
Hexagonal close packed
Cubic structure
Q.38
The metallic structure of mild steel is
Body centered cubic
Face centered cubic
Hexagonal close packed
Cubic structure
Q.39
Pure iron is the structure of
Ferrite
Pearlite
Austenite
Ferrite and cementite
Q.40
Hardness of martensite is about
RC 65
RC 48
RC 57
RC 80
Q.41
A coarse grained steel
Is less tough and has a greater tendency to distort during heat treatment
Is more ductile and has a less tendency to distort during heat treatment
Is less tough and has a less tendency to distort during heat treatment
Is more ductile and has a greater tendency to distort during heat treatment
Q.42
Cast iron is manufactured in
Blast furnace
Cupola
Open hearth furnace
Bessemer converter
Q.43
The molecules in a solid move
In a random manner
In a haphazard way
In circular motion
Back and forth like tiny pendulums
Q.44
Which of the following pipes is least corrosion resistant?
Brass
Mild steel
Cast iron
Wrought iron
Q.45
Points of arrest for iron correspond to
Stages at which allotropic forms change
Stages at which further heating does not increase temperature for some time
Stages at which properties do not change with increase in temperature
There is nothing like points of arrest
Q.46
The charge is fed into the blast furnace through the
Stack
Throat
Bosh
Tyres
Q.47
Hardness of upper bainite (acicular structure) is about
RC 65
RC 48
RC 57
RC 80
Q.48
A reversible change in the atomic structure of the steel with a corresponding change in the properties is known as
Allotropic change
Recrystallization
Heat treatment
Precipitation
Q.49
A reversible change in the atomic structure of steel with corresponding change in the properties is known as
Molecular change
Physical change
Allotropic change
Solidus change
Q.50
Y-alloy contains
3.5 to 4.5% copper, 0.4 to 0.7% magnesium, 0.4 to 0.7% manganese and rest aluminium
3.5 to 4.5% copper, 1.2 to 1.7% manganese, 1.8 to 2.3% nickel, 0.6% each of silicon, magnesium and iron, and rest aluminium
4 to 4.5% magnesium, 3 to 4% copper and rest aluminium
5 to 6% tin, 2 to 3% copper and rest aluminium
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