Engineering Metallurgy mcq
Q. 1. If austenite is allowed to transform i.e., cooled slowly at 727°C then the transformed
product is known as _______.
A : Ferrite
B : Pearlite
C : Bainite
D : Martensite
Pearlite
Q. 2. Arrange the following in terms of increasing severity of quench
P.Oil quenching
Q.Water quenching
R. Water quenching with agitation
S. Brine quenching
A : P<Q<R<S
B : Q<R<P<S
C : P<Q<S<R
D : Q<P<R<S
P
Q. 3. What is the crystal structure of austenite upon heating?
A : Body-centered cubic
B : Face-centered cubic
C : Hexagonal closely packed
D : Body-centered tetrahedral
Face-centered cubic
Q. 4. Which of the following cannot be obtained using a phase diagram?
A : Melting temperatures of various phases
B : Temperature range for solidification
C : Equilibrium solid solubility
D : Purity of materials
Purity of materials
Q. 5. Scanning probe microscope magnification is range between?
A : 10-1 to 10-3
B : 10-2 to 10-5
C : 10-3 to 10-6
D : 10-7 to 10-10
10-7 to 10-10
Q. 6. transmission electron microscopy (TEM) is used for ….?
A : Thick
B : Porous
C : Thin
D : Heavy
Thin
Q. 7. Following are the characteristics of martensitic transformation
A : It is diffusionless transformation
B : It has BCT structure
C : The cooling should be faster than CCR
D : All
All
Q. 8. Which of the following is used in electron microscope?
A : electron beams
B : magnetic fields
C : light waves
D : electron beams and magnetic fields
electron beams and magnetic fields
Q. 9. Match the phases of steel in Group I with the crystal structures in Group II GROUP I
GROUP II P. Martensite 1. bcc Q. Cementite 2. fcc R. Austenite 3. bct S. Ferrite 4.
Orthorhombic
A : P-3, Q-4, R-1, S-2
B : P-2, Q-3, R-1, S-4
C : P-3, Q-4, R-2, S-1
D : P-4, Q-3, R-2, S-1
P-3, Q-4, R-2, S-1
Q. 10. In the homogeneous nucleation, nucleation rate is maximum __________
A : At freezing point
B : Above boiling point
C : Below melting point
D : At room temperature
Below melting point
Q. 11. A specific body of material or a series of alloys with the same compositions is/are known
as _________
A : Component
B : System
C : Alloy
D : Solute
System
Q. 12. According to Hume Rothery’s rules, size of atoms must not differ by more than
________
A : 05
B : 0.15
C : 0.35
D : 0.55
0.15
Q. 13. Below the critical radius the tiny particles are _______ and are called _______
A : unstable, grains
B : stable, grains
C : unstable, embryo
D : stable, embryo
unstable, embryo
Q. 14. How many types of nucleation process are there and what are they?
A : 2 and (fusion and fission)
B : 2 and (Heterogeneous and Homogeneous)
C : 2 and (Heterogeneous and fusion)
D : 4 and (fusion, fission, Heterogeneous and Homogeneous)
2 and (Heterogeneous and Homogeneous)
Q. 15. Metallographic ……..is a chemical technique used to highlight features of metals at
microscopic levels
A : Mounting
B : Grinding
C : Polishing
D : Etching
Etching
Q. 16. Fine grain size, usually, cannot be obtained during the following process?
A : Slow cooling
B : fast cooling
C : increasing nucleation rate
D : retarding grain growth
Etching
Q. 17. If the cooling rate is fater than CCR the transformed product is known as
………………….
A : Ferrite
B : Pearlite
C : Bainite
D : Martensite
Martensite
Q. 18. The hardness of quenched Martensite
A : increases with increasing carbon percentage
B : decreases as carbon percentage increases
C : first increases and then remains almost constant as the carbon percentage increases
D : first increases and then decreases as carbon percentage increases.
first increases and then remains almost constant as the carbon percentage increases
Q. 19. One of the following is the transformation product of Austenite
A : Austenite to ferrite
B : Austenite to ledeburite
C : Austenite to martensite
D : None
Austenite to martensite
Q. 20. The critical nuclei radius is:
A : Proportional to the free energy
B : Proportional to the scattering vector
C : Inversely proportional to the surface tension
D : Proportional to the surface tension
Proportional to the surface tension
Q. 21. AFM stand for …………………….
A : Atomic Force Macroscopy
B : Atomic Force Microscopy
C : Automatic Force Microscopy
D : Atomic Forge Microscopy
Atomic Force Macroscopy
Q. 22. Chilled cast iron shows —— structure at the surface and —– structure at the centre.
A : Gray, White
B : White , Nodular
C : White , Black
D : White , Gray
White , Gray
Q. 23. Which among the following helps us in getting a three-dimensional picture of the
specimen?
A : Transmission Electron Microscope
B : Scanning Electron Microscope
C : Compound Microscope
D : Simple Microscope
Scanning Electron Microscope
Q. 24. Phases that exist on left side of an invariant reaction line are called……?
A : Pro-phase
B : Hypo-Phase
C : Hyper-Phase
D : Eutectoid
Hypo-Phase
Q. 25. The original grain size characteristics, however, can usually be restored by ……
A : Etching
B : stress relieving
C : Welding
D : Cold working
stress relieving
Q. 26. On what factors do the intensity of secondary electrons depend upon?
A : shape of the irradiated object
B : chemical composition of the irradiated object
C : number of electrons ejected
D : size and chemical composition of the irradiated object, number of electrons ejected and on the
size and chemical composition of the irradiated object, number of electrons ejected and on the
number of electrons reabsorbed by surrounding
Q. 27. The boundary line between (liquid+solid) and (solid) regions must be part of _________.
A : Slovus
B : Solidus
C : Liquidus
D : Tie-line
Solidus
Q. 28. Transformation of austenite to bainite starts from the nucleation of _____ at austenite
grain boundary.
A : Ferrite
B : Ledeburite
C : Martensite
D : Cementite
Ferrite
Q. 29. What is the melting point of pure iron?
A : 1500°C
B : 1535°C
C : 1570°C
D : 1605°C
1535°C
Q. 30. Which one of the following techniques does NOT require quenching to obtain final case
hardness?
A : Flame hardening
B : Induction hardening
C : Nitriding
D : Carburizing
Nitriding
Q. 31. The cast iron containing graphite in the form of flakes of graphite is …..
A : White Cast Iron
B : Chilled Cast Iron
C : Nodular Cast Iron
D : Gray Cast Iron
Gray Cast Iron
Q. 32. The boundary line between (alpha) and (alpha+beta) regions must be part of _________.
A : Slovus
B : Solidus
C : Liquidus
D : Tie-line
Slovus
Q. 33. Gibbs phase rule for general system:
A : P+F=C-1
B : P+F=C+1
C : P+F=C-2
D : P+F=C+2
P+F=C+2
Q. 34. Where does the solidification in a phase diagram start?
A : Liquidus line
B : Solidus line
C : At equilibrium
D : At freezing point
Liquidus line
Q. 35. Flow line are observed in which of following manufacturing process?
A : Casting
B : Welding
C : Forging
D : Forming
Forging
Q. 36. What is the highest magnification on an optical microscope?
A : 300 X
B : 1000X
C : 1500 X
D : 2000 X
1500 X
Q. 37. Pick the odd one in the following:
A : Isomorphous alloy
B : Terminal solid solution
C : Intermediate solid solution
D : Compound
Isomorphous alloy
Q. 38. Following is wrong about a phase diagram
A : It gives information on transformation rates
B : Relative amount of different phases can be found under given equilibrium conditions
C : It indicates the temperature at which different phases start to melt
D : Solid solubility limits are depicted by it.
It gives information on transformation rates
Q. 39. Nitric Acid and Alcohol is used for etching of ………. Material?
A : Plastic
B : Composite
C : Non-Ferrous Metals
D : Ferrous Metals
Ferrous Metals
Q. 40. Martensite obtained with carbon less than 0.6% is
A : Lath
B : Plate
C : Both
D : None
Lath
Q. 41. Which one of the following elements is an austenite stabilizer?
A : Nitrogen
B : Molybdenum
C : Vanadium
D : Tungsten
Nitrogen
Q. 42. Homogenous nucleation is:
A : The first step of any crystal growth.
B : Always leads to crystal growth.
C : A process that can lead to crystal growth.
D : A process that leads to crystal growth if paired with
A process that can lead to crystal growth
Q. 43. Reaction in which one solid gives two solid
A : Peritectic
B : Eutectic
C : Eutectoid
D : Monotectic
Q. 44. A solid + a liquid result in a solid up on equilibrium cooling during __________
reaction.
A : Peritectic
B : Eutectic
C : Eutectoid
D : Monotectic
Peritectic
Q. 45. Retained austenite can be eliminated by
A : Tempering
B : Sub zero treatment
C : Plastic deformation
D : All
All
Q. 46. The super saturated solution of carbon in iron BCT structure is known as
…………………
A : Ferrite
B : Pearlite
C : Bainite
D : Martensite
Martensite
Q. 47. The hardness of white cast iron is in the range of
A : 150 to 300 BHN
B : 350 to 500 BHN
C : 500 to 700 BHN
D : 800 to 900 BHN
350 to 500 BHN
Q. 48. at room temperature, hardness, yield strength, tensile strength, fatigue strength and
impact strength all …… with …….grain size.
A : Decrease, Increase
B : Increase, decrease
C : Increase, Increase
D : Decrease, Decrease
Increase, decrease
Q. 49. Iron-Carbon phase diagram is a ___________
A : Unary phase diagram
B : Binary phase diagram
C : Tertiary phase diagram
D : Ternary phase diagram
Binary phase diagram
Q. 50. The secondary electrons radiated back in scanning microscope is collected by?
A : specimen
B : anode
C : vacuum chamber
D : cathode
anode
Q. 51. Phases like bainite, pearlite & Martensite are transformed from …………..
A : Austenite
B : Ferrite
C : Both
D : None
Austenite
Q. 52. The austenite phase visible in microscope at room temperature is
A : Lower temperature austenite
B : Tempered austenite
C : weak austenite
D : Retained austenite
Retained austenite
Q. 53. Corrosion resistance of steel is increased by adding
A : Cr
B : Ni
C : Al
D : W
Cr
Q. 54. Carban Percentage in Steel is up to….?
A : 01
B : 021
C : 043
D : 067
021
Q. 55. Pearlite is __________.
A : Diffusion transformation
B : Diffusionless transformation
C : Both
D : None
Diffusion transformation
Q. 56. In SAE designation of steel , last two digits indicate the …………………
A : The average percent of carbon in the steel
B : The average percentage of Ni in the steel
C : The average percentage of Fe in steel
D : The average percentage of Cr in steel.
The average percent of carbon in the steel
Q. 57. The ability of a material to exist in more than one crystal structure is known as _______
A : Polymorphism
B : Allotropy
C : Polyhedral phase
D : Lattice
Polymorphism
Q. 58. Which of the following are true for electron microscopy?
A : specimen should be thin and dry
B : image is obtained on a phosphorescent screen
C : electron beam must pass through evacuated chamber
D : specimen should be thin and dry, image is obtained on a phosphorescent screen and electron beam
specimen should be thin and dry, image is obtained on a phosphorescent screen and electron beam
must pass through evacuated chamber
Q. 59. Iron-Carbon phase diagram is a ___________
A : Unary phase diagram
B : Binary phase diagram
C : Tertiary phase diagram
D : Ternary phase diagram
Binary phase diagram
Q. 60. Degree of scattering in transmission electron microscope is a function of __________
A : wavelength of electron beam used
B : number of atoms that lie in the electron path
C : number and mass of atoms that lie in the electron path
D : mass of atoms that lie in the electron path
number and mass of atoms that lie in the electron path
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