engineering materials MCQs – Page 2

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

engineering materials Mcqs
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