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Engineering Materials
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Engineering Materials Practice Set-4

May 10, 2021

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Page 1 of 4

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

Cup and cone formation is characteristic for brittle materials

High temperature and low strain rates favour brittle fracture

Brittle fracture is always preceded by noise

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

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

RC 57

RC 48

RC 65

RC 80

3. Stress relaxation is the phenomenon

In which parts are not loaded

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

In which stress remains constant on increasing load

Stress reduces on increasing load

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

Mild steel

Wrought iron

Cast iron

Brass

5. Recrystallization temperature can be lowered by

All of the above

Grain refinement

Working at lower temperature

Purification of metal

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

Sulphur

Manganese

Silicon

Phosphorus

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

Precipitation

Allotropic change

Recrystallization

Heat treatment

8. 1841 high speed steel contains

None of the above

Vanadium 18%, chromium 1% and tungsten 4%

Vanadium 4%, chromium 18% and tungsten 1%

Vanadium 1%, chromium 4% and tungsten 18%

9. The metallic structure of mild steel is

Face centered cubic

Hexagonal close packed

Cubic structure

Body centered cubic

10. Dye penetrant method is generally used to locate

Temporary defects

Core defects

Surface defects

Superficial defects

Page 2 of 4

11. Babbitt metal is a

Copper base alloy

Cadmium base alloy

Lead base alloy

Tin base alloy

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

Different crystal structures at different temperatures

Atoms distributed in random pattern

Any one of the above

Fixed structure at all temperatures

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

Gas turbine blades

Flywheel of steam engine

Cast iron pipes

Cycle chains

14. White cast iron contains carbon in the form of

Cementite

Graphite

White carbon

Free carbon

15. Age-hardening is related with

German silver

Stainless steel

Duralumin

Gun metal

16. Delta-iron occurs between the temperature ranges of

600°C to 900°C

1400°C to 1530°C

900°C to 1400°C

400°C to 600°C

17. Silicon when added to copper improves

Hardness and strength

Strength and ductility

Hardness

Machinability

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

The points where there is no further flow of metal

The points of discontinuity

The points where no further change occurs

Constant for all metals

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

Carburising

Tempering

Annealing

Normalizing

20. Wrought iron

Is a ductile material

Can be easily forged or welded

Cannot stand sudden and excessive shocks

All of these

Page 3 of 4

21. Connecting rod is, usually, made from

High speed steel

Low carbon steel

Medium carbon steel

High carbon steel

22. Vanadium in high speed steels

Forms very hard carbides and thus increases wear resistance

Promotes decarburisation

Promotes retention of austenite

Provides high hot hardness

23. Maximum percentage of carbon in austenite is

0.8%

0.025%

0.26%

1.7%

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

Toughness

Resilience

Creep

Fatigue strength

25. Ferromagnetic alpha iron exists in temperature range of

770 to 910°C

1400 to 1539°C

Below 723°C

910 to 1440°C

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

Optical microscope

Metallurgical microscope

X-ray techniques

Naked eye

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

Mesomorphous material

Amorphous material

None of these

Crystalline material

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

Sulphur

Silicon

Manganese

Phosphorus

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

Remain same

First increase and then decrease

Increase

Decrease

30. Pig iron is the name given to

Iron containing huge quantities of carbon

Product of blast furnace made by reduction of iron ore

Raw material for blast furnace

Iron in molten form in the ladles

Page 4 of 4

31. Which of the following statement is correct?

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

The product produced by blast-furnace is called cast iron

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

Brittleness

Hardness

Plasticity

Ductility

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

Copper and iron

Copper and nickel

Copper and tin

Copper and zinc

34. Inconel contains

80% nickel and 20% chromium

80% nickel, 14% chromium and 6% iron

65% nickel, 15% chromium and 20% iron

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

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

60 : 40

20 : 80

40 : 60

50 : 50

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

Manganese

Phosphorus

Silicon

Sulphur

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

Zinc

Sulphur

Tin

Vanadium

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

High speed steel

Heat resisting steel

Stainless steel

Invar

39. Nodular iron has

High tensile strength

Low melting point

All of the above

High machinability

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

Below 10°K

Around 0°C

Around 100°C

Above 100°K

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VideRime

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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