OJEE 2017 Question Paper M.Tech Metallurgical Engineering

FOR OJEE EXAM PREPARATION

OJEE 2017
Question Paper ·
M.Tech Metallurgical
Engineering
EXAM YEAR TYPE SUBJECT

OJEE 2017 Question Paper M.Tech Metallurgical Engineering

Notes · Sample Papers · Previous Year Papers · Mock Tests

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PGAT 2017
METALLURGICAL ENGINEERING

There are a total of 60 questions. All questions are of multiple choice types. A question will
have four choices for the answer with only one correct choice.

Q1. The crystal structure of α iron is

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(A) Face Centred Cubic

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(B) Simple Cubic

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(C) Closed Packed Hexagonal

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Whataissthe range of carbon percent in gray cast iron?
(D) Body Centred Cubic

l(A) 5 to 8% a g
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a (B) 0.35 to 0.75 %
Q2.

(C) 3 to 4%
(D) 7 to 9%

Q3. Zinc is used in galvanizing because
(A) Iron forms Fe2+ ions more readily than zinc
(B) Iron forms Fe2+ ions less readily than zinc
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(C) Zinc forms Zn2+ ions less readily than iron
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(D) All of the above

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Q4. VOD process is preferred over AOD process for making extra low carbon stainless
steel because
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(A) pCO can be lowered to a much lower level in the VOD than in the AOD
(B) AOD does not have adequate stirring
(C) AOD refractory is not stable in contact with extra low carbon
(D) Free-board needed for such operation is not available in the AOD

Q5. Aluminium is not commercially produced by carbothermic reduction primarily

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because

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(A) Melting point of aluminium is too low

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(B) Aluminium metal will have excessive dissolved oxygen

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(C) Al-Al2O3 line is too low in the Ellingham diagram and needs excessively high

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temperature
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Q6. In a froth flotation process, collector is a reagent which primarily
(A) Absorbs on unwanted mineral and makes it sink
(B) Promotes separation of particles from the froth
(C) Promotes bubble break-up and stabilize the foam
(D) Adsorbs on the surface of the minerals, and makes it hydrophobic

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Q7. With the increase in the degree of super cooling, the growth rate of a nucleus follows
which one of the following trends
(A) Only decreases
(B) First decreases and then increases
(C) First increases and then decreases
(D) Only increases

Q8. In slush casting
(A) Consumable patterns are used
(B) Plunger is used to force molten metal to fill up cavities
(C) Vacuum is applied to facilitate complete filling casting
(D) When a solid shell of sufficient thickness has formed, remaining liquid is
poured out

Q9. The rate of burning of coke in blast furnace is directly proportional to
(A) The area of fuel exposed to the blast furnace
(B) The temperature and pressure of the blast
(C) The affinity of particular type of carbon for oxygen
(D) All of the above

Q10. During LD blow in steelmaking the impurity that gets removed first is
(A) Carbon
(B) Phosphorous
(C) Manganese
(D) Silicon

Q11. Which one is NOT an agglomeration process?
(A) Nodulizing
(B) Briquetting
(C) Roasting
(D) Pelletizing

Q12. The important factors for the production of low silicon pig iron in a blast furnace are;
(A) Higher temperature and higher basicity
(B) Lower temperature and lower basicity
(C) Lower temperature and higher basicity
(D) Higher temperature and lower basicity

Q13. High top pressure in a blast furnace operation
(A) Favours the solution loss reaction
(B) Suppresses the solution loss reaction
(C) Decreases gas-solid contact time
(D) Increases coke rate

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Q14. Which one of the following factors is NOT desirable for effective phosphorous
removal in BOF steel making process?
(A) Higher FeO level in the slag
(B) Higher basicity
(C) Higher temperature
(D) Lower temperature

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Q15. Which of the following NDT techniques CANNOT be used to detect an internal crack

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in a steel shaft?

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(A) Liquid penetration inspection
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(B) Radiography
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(C) Ultrasonic testing
(D) X-ray tomography

Q16. Match the alloys names listed in Group-I with the main elements present in them
listed in Group-II

Group I Group II
P Babbit 1 Fe-Ni

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Q Muntz metal 2 Ni-Cr-Fe

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R Invar 3 Cu-Zn

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S Inconel 4 Sn-Sb-Cu

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(A) P-3,Q-1,R-4,S-2
(B) P-3,Q-4,R-1,S-2
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(C) P-4,Q-1,R-2,S-3
(D) P-4,Q-3,R-1,S-2

Q17. If the free energy change (ΔG) for a chemical reaction is very large and negative, then
the reaction is

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(A) Not feasible

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(B) Just feasible

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(C) Very much feasible

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(D) Unpredictable as ΔG is not a measure of feasibility of a reaction.

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(A) Some sand shearing from the cope surface
(B) Excessive gaseous substance not able to escape.
(C) Discontinuity in casting resulting from hindered contraction
(D) Two stream of metals that are too cold to fuse properly.

Q19. Which is the material of construction of mould used for casting ferrous materials in

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continuous casting process?

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(A) Copper

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(B) Mild steel
(C) High carbon steel
(D) Low carbon steel

Q20. In which of the steel making processes, the converter/vessel/furnace is rotated around
its axis during refining operation?
(A) L.D. process
(B) Kaldo vessel
(C) Bessemer converter
(D) Open hearth furnace

Q21. As per Sievert’s law for solubility of diatomic gases like H2, N2 and O2 in steel at a
particular temperature, the percentage of dissolved gas is proportional to
(A) p
(B) √p
(C) p2
(D) 1/p

Q22. In Rotary Kiln processes for the production of sponge iron the reducing agent used is
(A) Coke
(B) Metallurgical coke
(C) Non-metallurgical coal
(D) H2 gas

Q23. Thermit welding is a form of
(A) Fusion welding
(B) Resistance welding
(C) Forge welding
(D) Gas welding

Q24. The crystal structure of CsCl is
(A) BCC
(B) HCP
(C) FCC
(D) None of these

Q25. The metal flow under combined stress state in the metal working process is
(A) Extrusion
(B) Wiredrawing
(C) Tube drawing
(D) All of the these

Q26. The imaging of Scanning Electron Microscope is produced by
(A) Secondary electrons

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(B) Primary electrons
(C) Backscattered electrons
(D) Transmitted electrons

Q27. The flow curve of metals is dependent on
(A) Strain rate

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(B) Temperature

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(C) Flow stress

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(D) All of these

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Q28.
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The intensity of X ray diffraction depends on
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(A) Atomic scattering factor
(B) Polarisation factor
(C) Structure factor
(D) All of the above

Q29. Fettling is an operation carried out
(A) Before casting
(B) After casting

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(C) During casting

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(D) None of theses

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Q30. The nickel matte consists of
(A) Ni-Cu alloy
(B) Ni3S2 a
(C) Cu2S
(D) All of the above

Q31. The effect of alloying element decreases the eutectoid temperature
(A) Cr

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(B) Ni

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(C) C

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(D) All the three

s em Q32. The single crystal growth of semiconductor grade silicon is carried
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(A) Czochralaski method
(B) Floating zone method
(C) Both (A) & (B)
(D) None of these

Q33. The activation energy (Q) for diffusion in polycrystalline materials follows
(A) Qsurface < Qgrain boundary < Qlattice

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(B) Qsurface < Qgrain boundary > Qlattice

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(C) Qsurface > Qgrain boundary > Qlattice

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(D) All of the these

Q34. The concentration gradient in solids is expressed as
(A) mol/m-4
(B) mol/m-3
(C) mole/m-2s-1
(D) None of the these

Q35. The degree of freedom at which the FCC iron and BCC iron coexist in equilibrium
(A) 2
(B) 1
(C) 3
(D) None of these

Q36. If one solid phase splits into one liquid plus one solid phase on heating, the reaction is
(A) eutectiod
(B) eutectic
(C) peritectic
(D) peritectiod

Q37. The maximum solubility of Cu in Cu-Al alloy system is
(A) 0.2%
(B) 4.5%
(C) 5.65%
(D) None of these

Q38. Ceramics is brittle in nature, because
(A) No dislocation
(B) Amorphous
(C) wide dislocation
(D) Higher Peierls Nabarro stress

Q39. The linear thermal expansion coefficient depends on
(A) Bond strength
(B) Potential energy
(C) Potential well
(D) All the three

Q40. Corrosion rate is commonly expressed as
(A) Inch/ year
(B) Month/year
(C) Mils per year
(D) Mg/dm2/day

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Q41. Activation energy of a chemical reaction, homogeneous or heterogeneous, is
graphically estimated from a plot between
(A) k versus T
(B) 1/k versus T
(C) 1/k versus ln T
(D) ln k versus 1/T

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[Where, k is the rate constant and T is the absolute temperature]

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Q42. The chemical formula of wüstite is
(A) FeS2
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(B) Fe2O3
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(C) Fe3O4
(D) Fe1-xO

Q43. For an ideal hexagonal-closed packed structure, the packing efficiency is
(A) 52%
(B) 74%
(C) 68%
(D) 80%

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Q44. A plastically deformed metal crystal at low temperature exhibits wavy slip line pattern

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(A) Dislocation pile-up
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(B) Large number of slip systems
(C) Low stacking fault energy a
(D) Dislocation climb

Q45. Creep resistance decreases due to
(A) Small grain size
(B) Fine dispersoid size

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(C) Low stacking fault energy

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(D) High melting point

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(C) Stack Moulding
(D) Calendaring

Q47. Of the following welding processes
[P] Laser Beam Welding
[Q] Submerged Arc Welding

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[R] Metal Inert Gas Welding

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the width of the heat-affected zone in decreasing order is
(A) P > Q > R
(B) Q > R > P
(C) R > P > Q
(D) P > R > Q

Q48. For dye-penetrant test, the CORRECT statement is
(A) Pre- and post-cleaning of parts are not required
(B) Internal defects can be detected
(C) Surface oxides help in crack identification
(D) Dye with low contact angle is required

Q49. Match the deformation processes in Column I with the corresponding stress states
in Column II
Column I Column II
[P] Wire Drawing [1] Direct Compression
[Q] Forging [2] Indirect Compression
[R] Stretch Forming [3] Tension
[S] Cutting [4] Shear

(A) P-1; Q-2; R-3; S-4
(B) P-1; Q-2; R-4; S-3
(C) P-2; Q-1; R-3; S-4
(D) P-2; Q-1; R-4; S-3

Q50. With ε = true plastic strain and n = strain-hardening coefficient, necking in a
cylindrical tensile specimen of a work-hardening metal occurs when
(A) ε = n
(B) ε = 2n
(C) ε = n0.5
(D) ε = n2

Q51. Loading in Mode I fracture refers to
(A) Opening mode
(B) Sliding mode
(C) Tearing mode
(D) Twisting mode

Q52. Which one of the following alloy systems exhibits complete solid solubility?
(A) Cu-Ni
(B) Fe-Cu
(C) Pb-Sn
(D) Cu-Zn

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Q53. In the TTT diagram for the eutectoid carbon steel, the austenite to pearlite
transformation is the fastest at temperatures in the nose region of the C – curve. At
temperatures below the nose of the C-curve the transformation is slower due to low
diffusivity. At higher temperatures above the C- curve the delay is due to
(A) Low driving force for transformation
(B) Low mobility of dislocations

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(C) Low concentration of vacancies

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(D) Low diffusivity.

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Q54. Match the fracture processes in Group-I to the fracture surface morphologies in
Group-II.
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Group-I Group-II
(P) Ductile fracture (1) Cleavage
(Q) Brittle fracture (2) Dimples
(R) Fatigue fracture (3) Striations
(4) Veins

(A) P-4, Q-2, R-3
(B) P-2, Q-1, R-3

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(C) P-2, Q-3, R-1

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(D) P-4, Q-3, R-2

Q55. A defect that is bound by two mirrorsplanes
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(A) Twin
(B) Stacking fault a
(C) Grain boundary
(D) Edge dislocation

Q56. Fick’s first law relates
(A) Flux of atoms and the concentration gradient

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(B) Amount of gas dissolved in the molten metal and the partial pressure

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(C) Applied normal stress and the orientation of slip system

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(D) Heat flux and the temperature gradient

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(A) Alloy content
(B) Grain size
(C) Amount of carbon present
(D) Amount of cold work

Q58. Regarding the role of Stacking fault energy (SFE) on the work hardening ability of a
metal the correct logical sequence is
(A) High SFE → easy cross slip → low work hardening
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(B) High SFE → difficult cross slip → high work hardening

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(C) Low SFE → easy cross slip → low work hardening
(D) Low SFE → difficult cross slip → low work hardening

Q59. In an Ellingham diagram, the standard free energy change ∆Go for the oxidation
reaction of a metal M given by: xM + O2(g) →MxO2(s), is plotted as a function of
temperature. The slop of this line is positive because
(A) ∆So is positive
(B) ∆So is negative
(C) ∆Ho is positive
(D) ∆Ho is negative

Q60. Solution loss reaction is
(A) {CO2}g + <C>s = 2{CO}g
(B) 2{CO} = {CO2} + <C>g
(C) <C>g + {CO}= 2{CO2}
(D) none of these

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