1000+ Engineering Materials Multiple Choice Question Answer [Solved]

1. The material in which the atoms are arranged regularly in some directions but not in others, is called
A. Amorphous material
B. Mesomorphous material
C. Crystalline material
D. None of these
Answer : B

2. Annealing of white cast iron results in production of
A. Malleable iron
B. Nodular iron
C. Spheroidal iron
D. Grey iron
Answer : A

3. Mild steel belongs to the following category
A. Low carbon steel
B. Medium carbon steel
C. High carbon steel
D. Alloy steel
Answer : A

4. Corrosion resistance of steel is increased by addition of
A. Chromium and nickel
B. Sulphur, phosphorus, lead
C. Vanadium, aluminium
D. Tungsten, molybdenum, vanadium, chromium
Answer : A

5. White cast iron contains carbon in the form of
A. Free carbon
B. Graphite
C. Cementite
D. White carbon
Answer : C

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

7. In induction hardening ________ is high.
A. Current
B. Voltage
C. Frequency
D. Temperature
Answer : C

8. Cold rolled steel sheets contain carbon of the following order
A. 0.1 %
B. 0.2 %
C. 0.4 %
D. 0.6 %
Answer : A

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

10. Admiralty gun metal contains
A. 63 to 67% nickel and 30% copper
B. 88% copper, 10% tin and rest zinc
C. Alloy of tin, lead and cadmium
D. Iron scrap and zinc
Answer : B

11. Which of the following property is desirable in parts subjected to shock and impact loads?
A. Strength
B. Stiffness
C. Brittleness
D. Toughness
Answer : D

12. Machining properties of steel are improved by adding
A. Sulphur, lead, phosphorous
B. Silicon, aluminium, titanium
C. Vanadium, aluminium
D. Chromium, nickel
Answer : A

13. The lower critical point for all steels is
A. 600°C
B. 700°C
C. 723°C
D. 913°C
Answer : C

14. Recrystallisation temperature is one
A. At which crystals first start forming from molten metal when it is cooled
B. At which new spherical crystals first begin to form from the old deformed one when a strained metal is heated
C. At which change of allotropic form takes place
D. At which crystals grow bigger in size
Answer : B

15. Free carbon in iron makes the metal
A. Soft and gives a 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 : A

16. Pearlite consists 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 : B

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

18. The crystal of alpha iron is
A. Body centered cubic
B. Face centered cubic
C. Hexagonal close packed
D. Cubic structure
Answer : A

19. Which is false statement about normalizing? Normalizing is done to
A. Refine grain structure
B. Reduce segregation in casting
C. Improve mechanical properties
D. Induce stresses
Answer : D

20. Blast furnace produces following by reduction of iron ore
A. Cast iron
B. Pig iron
C. Wrought iron
D. Malleable iron
Answer : B

21. The alloying element which can replace tungsten in high speed steels is
A. Nickel
B. Vanadium
C. Cobalt
D. Molybdenum
Answer : D

22. Chilled cast iron has
A. No graphite
B. A very high percentage of graphite
C. A low percentage of graphite
D. Graphite as its basic constituent of composition
Answer : A

23. Age hardening is related to
A. Duralumin
B. Brass
C. Copper
D. Silver
Answer : A

24. The compressive strength of cast iron is ________ that of its tensile strength.
A. Equal to
B. Less than
C. More than
D. None of these
Answer : C

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

26. An important property of malleable cast iron in comparison to grey cast iron is the high
A. Compressive strength
B. Ductility
C. Carbon content
D. Hardness
Answer : B

27. Smelting is the process of
A. Removing the impurities like clay, sand etc. from the iron ore by washing with water
B. Expelling moisture, carbon dioxide, sulphur and arsenic from the iron ore by heating in shallow kilns
C. Reducing the ore with carbon in the presence of a flux
D. All of the above
Answer : C

28. 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

29. Sulphur in pig iron tends to make it
A. Hard
B. Soft
C. Ductile
D. Tough
Answer : A

30. Constantan an alloy used in thermocouples is an alloy of
A. Copper and tin
B. Copper and zinc
C. Copper and iron
D. Copper and nickel
Answer : D

31. In full annealing, the hypo eutectoid steel is heated from 30°C to 50°C above the upper critical temperature and then cooled
A. In still air
B. Slowly in the furnace
C. Suddenly in a suitable cooling medium
D. Any one of these
Answer : B

32. Bronze is an alloy of
A. Copper and zinc
B. Copper and tin
C. Copper, tin and zinc
D. None of these
Answer : B

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

34. The elastic stress strain behaviour of rubber is
A. Linear
B. Nonlinear
C. Plastic
D. No fixed relationship
Answer : B

35. Pick up wrong statement about wrought iron
A. It contains carbon of the order of 0 to 0.25%
B. It melts at 1535°C
C. It is very soft and ductile
D. It is made by adding suitable percentage of carbon to molten iron and subjecting the product to repeated hammering and rolling.
Answer : D

36. The molecules in a solid move
A. In a random manner
B. In a haphazard way
C. In circular motion
D. Back and forth like tiny pendulums
Answer : D

37. The loss of strength in compression with simultaneous gain in strength in tension due to overloading is known as
A. Hysteresis
B. Creep
C. Visco elasticity
D. Boeschinger effect
Answer : D

38. Cast iron is characterised by minimum of following percentage of carbon
A. 0.2 %
B. 0.8 %
C. 1.3 %
D. 2 %
Answer : D

39. In the lower part of the blast furnace (zone of fusion), the temperature is
A. 400° to 700°C
B. 800°C to 1000°C
C. 1200°C to 1300°C
D. 1500°C to 1700°C
Answer : C

40. Steel made from phosphate iron is
A. Brittle
B. Hard
C. Ductile
D. Tough
Answer : A

41. Amorphous material is one
A. In which atoms align themselves in a geometric pattern upon solidification
B. In which there is no definite atomic structure and atoms exist in a random pattern just as in a liquid
C. Which is not attacked by phosphorous
D. Which emits fumes on melting
Answer : B

42. Addition of manganese to aluminium results in
A. Improvement of casting characteristics
B. Improvement of corrosion resistance
C. One of the best known age and precipitation hardening systems
D. Improving machinability
Answer : B

43. In grey cast iron, carbon is present in the form of
A. Cementite
B. Free carbon
C. Flakes
D. Spheroids
Answer : C

44. High carbon steel carries carbon percentage
A. 0.1 to 0.3 %
B. 0.3 to 0.6 %
C. 0.6 to 0.8 %
D. 0.8 to 1.5 %
Answer : D

45. Cast iron is a
A. Ductile material
B. Malleable material
C. Brittle material
D. Tough material
Answer : C

46. Tungsten in high speed steel provides
A. Hot hardness
B. Toughness
C. Wear resistance
D. Sharp cutting edge
Answer : A

47. 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

48. The cupola is used to manufacture
A. Pig iron
B. Cast iron
C. Wrought iron
D. Steel
Answer : B

49. 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

50. If a refractory contains high content of silicon, it means refractory is
A. Acidic
B. Basic
C. Neutral
D. Brittle
Answer : C