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Engineering Materials
0

Engineering Materials Practice Set-4

May 10, 2021

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Page 1 of 4

1. The metallic structure of mild steel is

Face centered cubic

Body centered cubic

Cubic structure

Hexagonal close packed

2. Dye penetrant method is generally used to locate

Surface defects

Core defects

Superficial defects

Temporary defects

3. Stress relaxation is the phenomenon

In which stress remains constant on increasing load

Stress reduces on increasing load

In which deformation tends to loosen the joint and produces a stress reduced

In which parts are not loaded

4. Age-hardening is related with

Duralumin

Stainless steel

German silver

Gun metal

5. Wrought iron

Cannot stand sudden and excessive shocks

Is a ductile material

All of these

Can be easily forged or welded

6. Connecting rod is, usually, made from

High carbon steel

Low carbon steel

High speed steel

Medium carbon steel

7. Maximum percentage of carbon in austenite is

0.8%

1.7%

0.26%

0.025%

8. Ferromagnetic alpha iron exists in temperature range of

770 to 910°C

910 to 1440°C

Below 723°C

1400 to 1539°C

9. Delta-iron occurs between the temperature ranges of

600°C to 900°C

400°C to 600°C

1400°C to 1530°C

900°C to 1400°C

10. Super conduction by metals is observed in the temperature range of

Around 100°C

Below 10°K

Above 100°K

Around 0°C

Page 2 of 4

11. A reversible change in the atomic structure of the steel with a corresponding change in the properties is known as

Allotropic change

Precipitation

Heat treatment

Recrystallization

12. Which of the following when used in ordinary low carbon steels, makes the metal ductile and of good bending qualities?

Manganese

Sulphur

Silicon

Phosphorus

13. The addition of which of the following improves machining of copper?

Sulphur

Tin

Zinc

Vanadium

14. Macrostructure of a material is, generally, examined by

X-ray techniques

Naked eye

Optical microscope

Metallurgical microscope

15. Which of the following statement is true about brittle fracture?

Cup and cone formation is characteristic for brittle materials

Brittle fracture is always preceded by noise

Many metals with hexagonal close packed (H.C.P) crystal structure commonly show brittle fracture

High temperature and low strain rates favour brittle fracture

16. In low carbon steels, ________ raises the yield point and improves the resistance to atmospheric corrosion.

Phosphorus

Sulphur

Manganese

Silicon

17. The heat treatment process used for softening hardened steel is

Normalizing

Annealing

Tempering

Carburising

18. Recrystallization temperature can be lowered by

All of the above

Purification of metal

Grain refinement

Working at lower temperature

19. Which of the following impurity in cast iron promotes graphite nodule formation and increases the fluidity of the molten metal?

Manganese

Phosphorus

Silicon

Sulphur

20. For the allotropic forms of iron, the points of arrest are

Constant for all metals

The points where no further change occurs

The points where there is no further flow of metal

The points of discontinuity

Page 3 of 4

21. Babbitt metal is a

Cadmium base alloy

Tin base alloy

Copper base alloy

Lead base alloy

22. Constantan an alloy used in thermocouples is an alloy of

Copper and zinc

Copper and nickel

Copper and tin

Copper and iron

23. Which of the following material has nearly zero coefficient of expansion?

Heat resisting steel

High speed steel

Stainless steel

Invar

24. In which of the following cases, consideration of creep is important

Cycle chains

Gas turbine blades

Cast iron pipes

Flywheel of steam engine

25. The material in which the atoms are arranged regularly in some directions but not in others, is called

Amorphous material

None of these

Mesomorphous material

Crystalline material

26. White cast iron contains carbon in the form of

Free carbon

White carbon

Cementite

Graphite

27. Which of the following pipes is least corrosion resistant?

Brass

Mild steel

Cast iron

Wrought iron

28. An important property of high silicon (12-18%) cast iron is the high

Brittleness

Plasticity

Hardness

Ductility

29. Pig iron is the name given to

Product of blast furnace made by reduction of iron ore

Iron containing huge quantities of carbon

Raw material for blast furnace

Iron in molten form in the ladles

30. Silicon when added to copper improves

Hardness

Machinability

Hardness and strength

Strength and ductility

Page 4 of 4

31. A material is said to be allotropic, if it has

Any one of the above

Different crystal structures at different temperatures

Fixed structure at all temperatures

Atoms distributed in random pattern

32. 1841 high speed steel contains

Vanadium 4%, chromium 18% and tungsten 1%

Vanadium 1%, chromium 4% and tungsten 18%

Vanadium 18%, chromium 1% and tungsten 4%

None of the above

33. Hardness of lower bainite (tempered martensite) is about

RC 48

RC 80

RC 65

RC 57

34. Vanadium in high speed steels

Provides high hot hardness

Promotes decarburisation

Promotes retention of austenite

Forms very hard carbides and thus increases wear resistance

35. The ability of a material to absorb energy in the plastic range is called

Creep

Resilience

Toughness

Fatigue strength

36. Muntz metal contains copper and zinc in the ratio of

40 : 60

50 : 50

20 : 80

60 : 40

37. Inconel contains

80% nickel, 14% chromium and 6% iron

68% nickel, 29% copper and 3% other constituents

65% nickel, 15% chromium and 20% iron

80% nickel and 20% chromium

38. Which of the following statement is correct?

The product produced by blast-furnace is called cast iron

The cast iron has high tensile strength

The chilled cast iron has no graphite

The pig iron is the name given to the product produced by cupola

39. Nodular iron has

High machinability

Low melting point

All of the above

High tensile strength

40. The ultimate tensile strength and yield strength of most of the metals, when temperature falls from 0 to 100°C will

Remain same

Increase

Decrease

First increase and then decrease

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A Demrot is the founder of VideRime Online Learning, a leading engineering website. He did his BE Civil and M.Tech Structure from RGPV University, Bhopal and has been working as an Assistant Professor in a reputed college.

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