Which of the following material structures has a co-ordination number of 8?
a. Body centered cubic structure
b. Face centered cubic structure
c. Hexagonal closed packed structure
d. Simple cubic structure
Which type of solid solution does the diffusion of materials like Copper and Zinc, Gold and Copper constitute?
a. Ordered substitutional solid solution
b. Disordered substitutional solid solution
c. Substitutional solid solution
d. Disordered solid solution
Calculate the value of D200 in a metal. The metal has a face centered cubic structure and an atomic radius equal to 5 Å.
a. 2.5 Å
b. 1.5 Å
c. 3.5 Å
d. 4.5 Å
The nuclei grow due to the ___________.
a. addition of atoms
b. addition of molecules
c. addition of crystallographic structures
Which among the following methods of determining the condition of crystal structure materials is applicable to polycrystalline materials?
a. Laue method
b. Rotating crystal method
c. Powder method
Critical cooling rate is the slowest rate of cooling at which ___________.
a. martensite is converted into austenite
b. austenite is converted into martensite
c. cementite is converted into austenite
d. cementite is converted into martensite
Calculate the thickness of the deposition of a solid metal on the basis of the given parameters:
Aj = 10 mm / hour (where Aj is a constant which depends upon the poured metal and the mold material)
T = 25 hours (time required for the metal to solidify)
Aj = 10 mm / hour (where Aj is a constant which depends upon the poured metal and the mold material)
T = 25 hours (time required for the metal to solidify)
a. 40mm
b. 50mm
c. 60mm
d. 70mm
In the above temperature and time graph, which of the following represents the Binary Eutectic System?
a. 1
b. 2
c. 3
Which among the following magnetic properties of materials explains the drop in electrical resistance becoming zero at a temperature below a certain critical temperature?
a. Permeability
b. Coercive force
c. Hysteresis
d. Superconductivity
What is the angle of tilt in a tilt boundary surface imperfection?
a. 20º
b. 30º
c. less than 10º
d. more than 30º
Which among the following basic methods for grain size is known as the Heyn method?
a. The comparison method
b. The intercept method
c. The panimetric method
d. The Jeffries method
__________ is the ability of a material to take a different shape as a result of
hammering or rolling.
a. Ductility
b. Malleability
c. Brittleness
Which type of rubber gloves are worn by people handling laboratory equipments?
a. Nitrile rubber
b. Butyl rubber
c. Silicone rubber
d. Synthetic Butadiene rubber
Which technique is used to make the grain boundaries of a material visible for micro or macro examination?
a. Etching
b. Polishing
c. Grinding
d. Cutting
Which type of diffusion occurs due to the atomic migration along the surface of a phase?
a. Self-diffusion
b. Inter-diffusion
c. Volume diffusion
d. Surface diffusion
__________ is the capacity of a material to absorb energy when it is deformed.
a. Resilience
b. Toughness
c. Plasticity
d. Elasticity
Which among the following types of defects includes edge and screw dislocation?
a. Point defects
b. Line defects
c. Planar surface defects
d. Volume defects
Which among the following tests is used to determine the deformation of a material at elevated temperatures?
a. Creep test
b. Fatigue test
c. Torsion test
d. Bend test
Which among the following type of steels is used to make milk cans for dairy industry?
a. Maraging steels
b. Martensitic stainless steels
c. Ferritic stainless steels
d. Austenitic stainless steels
Which temperature is called the Curie point, the point at which the magnetic property of iron begins to diminish?
a. 470ºC
b. 570ºC
c. 670ºC
d. 770ºC
In which among the following phase diagrams, is the temperature plotted on the vertical axis?
a. Unary phase diagrams
b. Binary phase diagrams
c. Ternary phase diagrams
Which type of adhesive materials among the following is made from thermosetting materials?
a. Chemically reactive adhesives
b. Pressure adhesives
c. Fusible adhesives
d. Air drying adhesives
On the basis of which of the following factors do metals tend to form an intermediate phase rather than a solid solution?
a. Crystal structure factor
b. Relative size factor
c. Chemical affinity factor
d. Relative valence factor
Which type of bond exists between a metallic atom and a non-metallic atom?
a. Ionic bond
b. Covalent bond
c. Metallic bond
Which among the following is a microstructure of ferrite and cementite produced on tempering martensite at a temperature above 400ºC?
a. Trostite
b. Sorbite
c. Bainite
d. Pearlite
The arrangement of the internal components of matter in a material is known as ___________.
a. structure
b. density
c. porosity
d. hardness
Calculate the D220 spaces of a face centered cubic structure having an atomic radius equal to 2Å.
a. 2 Å
b. 3 Å
c. 4 Å
d. 5 Å
During the solidification of alloys, the liquid phase reacts with the solid phase, which leads to the formation of the solid phase having a different structure. Such a reaction is knows as __________.
a. peritectic reaction
b. eutectic reaction
c. eutectoid reaction
d. peritectoid reaction
According to the ratio of valence electrons and the number of atoms, in which ratio do beta (β) compounds fall?
a. 3/2
b. 21/13
c. 7/4
d. 5/9
Which form of heat treatment process helps in increasing the carbon content of steel?
a. Carburizing
b. Nitriding
c. Cyaniding
d. Carbonitriding
The beginning of the phase transformation is termed as __________.
a. nucleation
b. progressive solidification
c. supercooling
Which among the following mathematical expressions is used to represent the Gibbs Phase rule?
where
P = Phase
F = Degrees of freedom
C = Number of components
where
P = Phase
F = Degrees of freedom
C = Number of components
a. P+F = C+2
b. P-F = C-2
c. P/F = 2C
d. P/C = 2F
A metal above the freezing point is in a:
a. liquid state
b. solid state
c. gaseous state
d. supercooled state
By which of the following equations can the number of defects at equilibrium be determined?
where
nd = number of defects
Ne = number of atomic sites per cubic mole
Ed = energy of activation necessary to produce a defect
k = Boltzman's constant
T = Absolute temperature
where
nd = number of defects
Ne = number of atomic sites per cubic mole
Ed = energy of activation necessary to produce a defect
k = Boltzman's constant
T = Absolute temperature
a. nd=Ne-Ed/kT
b. nd=Ne-Ed*kT
c. nd=NekT/-Ed
d. nd=NekT*-Ed
Which among the following types of nuclear fuels is used as structural components in water cooled systems as well as for cladding fuel elements?
a. Uranium
b. Thorium
c. Zirconium
d. Plutonium
in the austenite phase which form of heat treatment processes is used to deform metastable steel?
a. Ausforming
b. Maraging
c. Austempering
d. Martempering
e. Interrupted quenching
What is the importance of Burger's vector in line defect?
a. It marks the magnitude of the strain component of dislocation.
b. It marks the direction of the strain component of dislocation.
c. It marks the magnitude and direction of the strain component of dislocation
d. It marks the velocity of the strain component of dislocation.
e. It marks the velocity and direction of the strain component of dislocation.
A small atom during diffusion has:
a. higher activation energy than a large atom.
b. lower activation energy than a large atom.
c. the same degree of activation energy as a large atom.
The diffusive processes are irreversible by nature and tend to ______.
a. increase entropy
b. increase enthalpy
c. decrease entropy
d. decrease enthalpy
Which among the following is not a destructive testing method for materials?
a. Tensile test
b. Impact test
c. Bend test
d. Ultrasonic inspection test
e. Torsion test