UPSC CSE - Engineering Materials 1000+ MCQ [Solved] PDF Download

1. Grey cast iron
A. Contains 1.7 to 3.5% carbon in Free State and is obtained by the slow cooling of molten cast iron
B. Is also known as chilled cast iron is obtained by cooling rapidly. It is almost unmachinable
C. Is produced by annealing process. I is soft, tough and easily machined metal
D. Is produced by small additions o magnesium (or cerium) in the ladle Graphite is in nodular or spheroidal form and is well dispersed throughout the material
Answer : A

2. Corrosion resistance of steel is increased by adding
A. Chromium and nickel
B. Nickel and molybdenum
C. Aluminium and zinc
D. Tungsten and sulphur
Answer : A

3. Which of the following is the binding material in cemented carbides?
A. Cobalt
B. Nickel
C. Vanadium
D. Iron
Answer : A

4. In low carbon steels, ________ raises the yield point and improves the resistance to atmospheric corrosion.
A. Sulphur
B. Phosphorus
C. Manganese
D. Silicon
Answer : B

5. The ratio of the volume occupied by the atoms to the total volume of the unit cell is called
A. Coordination number
B. Atomic packing factor
C. Space lattice
D. None of these
Answer : B

6. Monel metal is an alloy of
A. Nickel and copper
B. Nickel and chromium
C. Nickel, Chromium and iron
D. Copper and chromium
Answer : A

7. The metallic structure of mild steel is
A. Body centred cubic
B. Face centred cubic
C. Hexagonal close packed
D. Cubic structure
Answer : A

8. Ball bearings are, usually, made from
A. Low carbon steel
B. High carbon steel
C. Medium carbon steel
D. Chrome steel
Answer : D

9. A steel containing 16 to 18% chromium and about 0.12% carbon is called
A. Ferritic stainless steel
B. Austenitic stainless steel
C. Martenistic stainless steel
D. Nickel steel
Answer : A

10. For a steel containing 0.8% carbon
A. There is no critical point
B. There is only one critical point
C. There are two critical points
D. There can be any number of critical points
Answer : B

11. Manganese is added in low carbon steel to
A. Make the steel tougher and harder
B. Raise the yield point
C. Make the steel ductile and of good bending qualities
D. All of the above
Answer : C

12. Tungsten when added to steel ________ the critical temperature.
A. Does not effect
B. Lowers
C. Raises
D. None of these
Answer : C

13. Cupola produces following material
A. Cast iron
B. Pig iron
C. Wrought iron
D. Malleable iron
Answer : A

14. Crystal structure of a material is, generally, examined by
A. Naked eye
B. Optical microscope
C. Metallurgical microscope
D. X-ray techniques
Answer : D

15. In high speed steels, manganese is used to tougher the metal and to increase its
A. Yield point
B. Critical temperature
C. Melting point
D. Hardness
Answer : B

16. Compressive strength of grey cast iron in tonnes/cm is of the order of
A. 35
B. 57
C. 710
D. 1015
Answer : B

17. Cementite consist of
A. 13% carbon and 87% ferrite
B. 13% cementite and 87% ferrite
C. 13% ferrite and 87% cementite
D. 6.67% carbon and 93.33% iron
Answer : D

18. Cast iron has
A. High tensile strength
B. Its elastic limit close to the ultimate breaking strength
C. High ductility
D. All of the above
Answer : B

19. Which is false statement about annealing? Annealing is done to
A. Relieve stresses
B. Harden steel slightly
C. Improve machining characteristic
D. Soften material
Answer : B

20. Steel with ________ carbon is known as hypo-eutectoid steel.
A. 0.8 %
B. Below 0.8 %
C. Above 0.8 %
D. None of these
Answer : B

21. Solder is an alloy consisting of
A. Tin, antimony, copper
B. Tin and copper
C. Tin and lead
D. Lead and zinc
Answer : B

22. Which of the following property is desirable for materials used in tools and machines?
A. Elasticity
B. Plasticity
C. Ductility
D. Malleability
Answer : A

23. When low carbon steel is heated up to lower critical temperature
A. There is no change in grain size
B. The average grain size is a minimum
C. The grain size increases very rapidly
D. The grain size first increases and then decreases very rapidly
Answer : A

24. Aluminium bronze contains
A. 94% aluminium, 4% copper and 0.5% Mn, Mg, Si and Fe
B. 92.5% aluminium, 4% copper, 2% nickel, and 1.5% Mg
C. 10% aluminium and 90% copper
D. 90% magnesium and 9% aluminium with some copper
Answer : C

25. Steel containing ferrite and pearlite is
A. Hard
B. Soft
C. Tough
D. Hard and tough
Answer : B

26. Silicon when added to copper improves
A. Machinability
B. Hardness
C. Hardness and strength
D. Strength and ductility
Answer : C

27. The metal suitable for bearings subjected to light loads, is
A. Silicon bronze
B. White metal
C. Monel metal
D. Phosphor bronze
Answer : D

28. Tin base white metals are used where the bearings are subjected to
A. Large surface wear
B. Elevated temperatures
C. Light load and pressure
D. High pressure and load
Answer : A

29. Preheating is essential in welding
A. Cast iron
B. High speed steel
C. All nonferrous materials
D. All of the above
Answer : A

30. Large forgings, crank shafts, axles normally contain carbon up to
A. 0.05 to 0.20 %
B. 0.20 to 0.45 %
C. 0.45 to 0.55 %
D. 0.55 to 1.0 %
Answer : C

31. Argentite is the principal ore or raw material for
A. Aluminium
B. Tin
C. Zinc
D. Silver
Answer : D

32. By severely deforming a metal in a particular direction it becomes
A. Ductile
B. Malleable
C. Homogeneous
D. Anisotropic
Answer : D

33. Dow metal contains
A. 94% aluminium, 4% copper and 0.5% Mn, Mg, Si and Fe
B. 92.5% aluminium and, 4% copper, 2% nickel and 1.5% Mg
C. 90% aluminium and 90% copper
D. 90% magnesium and 9% aluminium with some copper
Answer : D

34. The carbon in the pig iron varies from
A. 0.1 to 0.5 %
B. 0.5 to 1 %
C. 1 to 5 %
D. 5 to 10 %
Answer : C

35. In process annealing, the hypo eutectoid steel is
A. Heated from 30°C to 50°C above the upper critical temperature and then cooled in still air
B. Heated from 30°C to 50°C above the upper critical temperature and then cooled suddenly in a suitable cooling medium
C. Heated from 30°C to 50°C above the upper critical temperature and then cooled slowly in the furnace
D. Heated below or closes to the lower critical temperature and then cooled slowly
Answer : D

36. The property of a material due to which it breaks with little permanent distortion, is called
A. Brittleness
B. Ductility
C. Malleability
D. Plasticity
Answer : A

37. Malleable cast iron
A. Contains 1.7 to 3.5% carbon in Free State and is obtained by the slow cooling of molten cast iron
B. Is also known as chilled cast iron and is obtained by cooling rapidly. It is almost unmachinable
C. Is produced by annealing process. It is soft, tough, and easily machined metal
D. Is produced by small additions of magnesium (or cerium) in the ladle. Graphite is in the nodular or spheroidal form and is well dispersed throughout the material
Answer : C

38. Blast furnace is used to produce
A. Pig iron
B. Cast iron
C. Wrought iron
D. Steel
Answer : A

39. When filing or machining cast iron makes our hands black, then it shows that ________ is present in cast iron.
A. Cementite
B. Free graphite
C. Both A and B
D. None of these
Answer : B

40. Following elements have face-centred cubic structure
A. Gamma iron (910° to 1400°C), Cu, Ag, Au, Al, Ni, Pb, Pt
B. Mg, Zn, Ti, Zr, Br, Cd
C. A iron (below 910°C and between 1400 to 1539°C), W
D. All of the above
Answer : A

41. The aluminium alloy made by melting aluminium with 2 to 10% magnesium and 1.75% copper is called
A. Duralumin
B. Y-alloy
C. Magnalium
D. Hindalium
Answer : C

42. In low carbon steels, presence of small quantities of sulphur improves
A. Weldability
B. Formability
C. Machinability
D. Hardenability
Answer : C

43. Combined carbon in iron makes the metal
A. Soft and gives coarse grained crystalline structure
B. Soft and gives a fine grained crystalline structure
C. Hard and gives a coarse grained crystalline structure
D. Hard and gives a fine grained crystalline structure
Answer : D

44. The usual composition of a soldering alloy is
A. Tin, lead and small percentage of antimony
B. Tin and lead
C. Tin, lead and silver
D. Tin and copper
Answer : A

45. The following types of materials are usually the most ductile
A. Face centred cubic lattice
B. Body centred cubic lattice
C.D. All of the above
Answer : A

46. Iron ore is, usually, found in the form of
A. Oxides
B. Carbonates
C. Sulphides
D. All of these
Answer : D

47. The tensile strength of wrought iron is maximum
A. Along the lines of slag distribution
B. Perpendicular to lines of slag distribution
C. Uniform in all directions
D. None of the above
Answer : A

48. Materials after cold working are subjected to following process to relieve stresses
A. Hot working
B. Tempering
C. Normalising
D. Annealing
Answer : D

49. Duralumin contains
A. 94% aluminium, 4% copper and 0.5% Mn, Mg, Si and Fe
B. 92.5% aluminium, 40% copper, 2% nickel, and 1.5% Mg
C. 10% aluminium and 90% copper
D. 90% magnesium and 9% aluminium with some copper
Answer : A

50. Aluminium bronze contains aluminium and copper in the ratio of
A. 50 : 50
B. 40 : 60
C. 60 : 40
D. 10 : 90
Answer : D