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engineering materials MCQs

Practise focused engineering materials questions with marked answers for exam preparation and subject revision.

engineering materials Mcqs

1. The ultimate tensile strength and yield strength of most of the metals, when temperature falls from 0 to l00C will _________________?
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A. decrease

B. remain same

C. show unpredictable behaviour

D. increase

E. first increase and then decrease

2. The unique property of cast iron is its high ___________________?
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A. ductility

B. hardness

C. damping characteristics

D. malleability

E. surface finish

3. A reversible change in the atomic structure of steel with corresponding change in the properties is known as___________________?
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A. molecular change

B. allotropic change

C. atomic change

D. solidus change

E. physical change

4. Malleability of a material can be defined as ______________________?
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A. all of the above

B. ability to undergo large permanent deformations in compression

C. none of the above

D. ability to undergo large permanent deformations in tension

E. ability to recover its original form

5. The ability of a material to resist softening at high temperature is known as____________________?
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A. creep

B. hot hardness

C. superhardening

D. hot tempering

E. fatigue

6. Points of arrest for iron correspond to__________________?
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A. stages at which properties do not change with increase in temperature

B. there is nothing like points of arrest

C. none of the above

D. stages at which further heating does not increase temperature for some time

E. stages at which allotropic forms change

7. The crystal of alpha iron is ____________________?
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A. cubic structure

B. hexagonal close packed

C. orthorhombic crystal

D. body centred cubic

E. face centred cubic

8. Isotropic materials are those which have the same ____________________?
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A. stresses induced in all directions

B. density throughout

C. elastic properties in all directions

D. thermal properties in all directions

E. electric and magnetic properties in all directions

9. Stress relaxation is- the phenomenon ___________________?
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A. none of the above

B. in which stress remains constant on in-creasing load

C. stress reduces on increasing load

D. in which parts are not loaded

E. in which deformation tends to loosen the joint and produces a stress reduced

10. Ferromagnetic alpha iron exists in temperature range of________________?
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A. below 723C

B. 1400-1539C

C. 910-1440C

D. above 1539C

E. 770 910C

11. A material is known as allotropic or polymorphic if it __________________?
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A. has its atoms distributed in a random pattern

B. none of the above

C. responds to heat treatment

D. has a fixed structure under all conditions

E. exists in several crystal forms at different temperatures

12. The percentage of carbon in grey iron castings usually varies between __________________?
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A. 5 7%

B. 1 2%

C. 7-9%.

D. 2.5 to 4.5%

E. 0.5 to 1%

13. Mild steel belongs to the following category___________________?
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A. low carbon steel

B. special steel

C. high carbon steel

D. medium carbon steel

E. alloy steel

14. For the allotropic forms of iron, the points of arrest are __________________?
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A. the points where major changes take place

B. constant for all metals

C. the points of discontinuity

D. the points where no further change oc-curs

E. the points where there is no further flow of metal

15. Which of the following constituents of steels is softest and least strong ________________?
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A. cementlte

B. ferrite

C. bainite

D. austenite

E. pearlite

16. In grey cast iron, carbon is present in the form of____________________?
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A. flakes

B. free carbon

C. nodular aggregates of graphite

D. cementite

E. spheroids

17. The temperature at which ferromagnetic alpha iron transforms to paramagnetic alpha iron is _______________?
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A. 1050C

B. below recrystallisation temperature

C. above recrystallization temperature

D. 910C

E. 770C

18. The loss of strength in compression with simultaneous gain in strength in tension due to overloading is known as________________?
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A. visco elasticity

B. hysteresis

C. creep

D. inelasticity

E. Boeschinger effect

19. Blast furnace produces following by reduction of iron ore_______________?
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A. white iron

B. pig iron

C. malleable iron

D. wrought iron

E. cast iron

20. Machining properties of steel are improved by adding___________________?
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A. chromium, nickel

B. lubricants

C. sulphur, lead, phosphorous

D. silicon, aluminium, titanium

E. vanadium, aluminium

21. Which is false statement about tempering. Tempering is done to_______________?
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A. improve machinability

B. release stresses

C. reduce hardness and brittleness

D. improve ductility

E. improve toughness

22. Which of the following pipes is least corrosion resistant__________________?
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A. mild steel

B. wrought iron

C. cast iron

D. copper

E. brass

23. The hardness of steel increases if it contains____________________?
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A. pearlite

B. martensite

C. all of the above

D. cementite

E. austenite

24. Permalloy is a___________________?
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A. kind of stainless steel

B. none ferrous alloy

C. nickel and iron alloy having high permeability

D. cutting tool material

E. polymer

25. Aluminium bronze contains__________________?
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A. 90% magnesium and 9% aluminium with some copper

B. 92.5% aluminium, 4% copper, 2% nickel, and 1.5% Mg

C. 10% aluminium and 90% tin

D. 10% aluminium and 90% copper

E. 94% aluminium, 4% copper and 0.5% Mn, Mg, Si and Fe

26. An important property of high silicon (12 18%) cast iron is the high__________________?
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A. brittleness

B. corrosion resistance

C. plasticity

D. tenacity

E. hardness

27. Age-hardening is related with______________?
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A. german silver

B. duralumin

C. gun metal

D. cast iron

E. stainless steel

28. The hardness of steel primarily depends on _____________________?
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A. shape of carbides and their distribution in iron

B. heat treatment employed

C. method of manufacture

D. %age of alloying elements

E. %age of carbon

29. Hardness of upper bainite (acicular structure) is about___________________?
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A. RC 48

B. RC 32.

C. RC 65

D. RC 57

E. RC 80

30. Surveying tapes are made of a material having low coefficient of expansion and enough strength. The alloy used is__________________?
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A. invar

B. duralumin

C. silver metal

D. monel metal

E. Hastelloy

31. Amorphous material is one___________________?
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A. in which there is no definite atomic structure and atoms exist in a random pattern just as in a liquid

B. none of the above

C. in which atoms align themselves in a geometric pattern upon solidification

D. which emits fumes on melting

E. which is not attacked by phosphorous

32. Which is false statement about properties of aluminium ___________________?
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A. corrosion resistance is good

B. fatigue strength is not high

C. modulus of elasticity is fairly low

D. wear resistance is very good

E. creep strength limits its use to fairly low temperatures

33. Basic solution is one which has pH value___________________?
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A. equal to 7

B. pH value has nothing to do with basic solution

C. less than 7

D. greater than 7

E. none of the above

34. The alloy used for making electrical resistances and heating elements is____________________?
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A. magnin

B. peiminvar

C. nichrome

D. elinvar

E. invar

35. The percentage of carbon in pig iron varies from___________________?
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A. 0.1 to 1.2%

B. 4 to 4.5%

C. 4.5 to 6.3%.

D. 2.5 to 4%

E. 1.5 to 2.5%

36. Pick up the wrong statement Nickel and chromium in steel help in _________________?
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A. providing high strength at elevated temperatures

B. improving machining properties

C. raising the elastic limit

D. improving the resilience and ductility

E. providing corrosion resistance

37. Vanadium in high speed steels__________________?
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A. forms very hard carbides and thus in-creases wear resistance

B. provides high hot hardness

C. promotes decarburisation

D. promotes retention of austenite

E. increases toughness

38. White cast iron contains carbon in the form of__________________?
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A. cementite

B. graphite

C. free carbon

D. white carbon

E. ferrite

39. A reversible change in the atomic structure of the steel with a corresponding change in the properties is known as_________________?
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A. precipitation

B. allotropic change

C. recrystallisation

D. heat treatment

E. austempering

40. By severely deforming a metal in a particular direction it becomes _________________?
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A. homogeneous

B. ductile

C. malleable

D. anisotropic

E. isotropic

41. Recrystallisation temperature can belowered by_________________?
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A. all of the above

B. grain refinement

C. none of the above

D. purification of metal

E. working at lower temperature

42. Lead is poured into the joint between two pipes. These pipes may be made of____________________?
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A. asbestos cement

B. concrete

C. vitrified clay

D. mild steel

E. cast iron

43. The percentage of carbon in low carbon steel is__________________?
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A. 0.15%

B. 0.7%.

C. 0.05%

D. 0.30%

E. 0.50%

44. Babbit metal is a_________________?
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A. A. and C. above

B. tin base alloy

C. lead base alloy

D. copper base alloy

E. all of the above

45. Wrought iron is________________?
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A. least resistant to corrosion

B. high in strength

C. heat treated to change its properties

D. highly resistant to corrosion

E. hard

46. Railway rails are normally made of_______________?
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A. cast iron steel

B. tungsten steel

C. high carbon

D. alloy steel

E. mild steel

47. Cast iron has_________________?
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A. none of the above

B. high ductility

C. high tensile strength

D. its elastic limit close to the ultimate breaking strength

E. all of the above

48. Chromium in steel_________________?
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A. makes steel hard

B. refines grain size and produces less tendency to carburisation, improves corrosion and heat resistant properties

C. gives ductility, toughness, tensile strength and anticorrosion properties

D. improves wear resistance, cutting ability and toughness

E. improves cutting ability and reduces hardenability

49. The correct sequence for descending order of machinability is _____________________?
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A. grey cast iron, wrought iron, low carbon steel

B. grey cast iron, low carbon steel, wrought iron

C. wrought iron,low carbon steel, grey cast iron

D. low carbon steel, grey cast iron, wrought iron

E. wrought iron, grey cast iron, low carbon steel

50. Pure iron is the structure of_______________?
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A. pearlite

B. ferrite

C. ferrite and cementite

D. ferrite and pearlite

E. anstenite

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