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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. Recrystallization temperature can be lowered by

Purification of metal

All of the above

Working at lower temperature

Grain refinement

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

Brittle fracture is always preceded by noise

Cup and cone formation is characteristic for brittle materials

High temperature and low strain rates favour brittle fracture

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

3. Age-hardening is related with

Duralumin

Stainless steel

German silver

Gun metal

4. Wrought iron

Is a ductile material

Can be easily forged or welded

Cannot stand sudden and excessive shocks

All of these

5. 1841 high speed steel contains

None of the above

Vanadium 1%, chromium 4% and tungsten 18%

Vanadium 4%, chromium 18% and tungsten 1%

Vanadium 18%, chromium 1% and tungsten 4%

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

Resilience

Creep

Toughness

Fatigue strength

7. White cast iron contains carbon in the form of

Free carbon

Cementite

White carbon

Graphite

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

40 : 60

20 : 80

50 : 50

60 : 40

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

Decrease

Increase

First increase and then decrease

Remain same

10. Which of the following statement is correct?

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

The chilled cast iron has no graphite

The product produced by blast-furnace is called cast iron

The cast iron has high tensile strength

Page 2 of 4

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

Cycle chains

Gas turbine blades

Flywheel of steam engine

Cast iron pipes

12. Maximum percentage of carbon in austenite is

0.26%

0.8%

0.025%

1.7%

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

Copper and zinc

Copper and tin

Copper and iron

Copper and nickel

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

Mesomorphous material

None of these

Crystalline material

Amorphous material

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

Vanadium

Zinc

Tin

Sulphur

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

Hardness

Ductility

Plasticity

Brittleness

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

Below 10°K

Around 0°C

Above 100°K

Around 100°C

18. Pig iron is the name given to

Iron in molten form in the ladles

Product of blast furnace made by reduction of iron ore

Raw material for blast furnace

Iron containing huge quantities of carbon

19. Silicon when added to copper improves

Hardness

Strength and ductility

Hardness and strength

Machinability

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

Constant for all metals

The points of discontinuity

The points where no further change occurs

The points where there is no further flow of metal

Page 3 of 4

21. Nodular iron has

High tensile strength

High machinability

Low melting point

All of the above

22. Dye penetrant method is generally used to locate

Core defects

Surface defects

Superficial defects

Temporary defects

23. The metallic structure of mild steel is

Face centered cubic

Cubic structure

Hexagonal close packed

Body centered cubic

24. Delta-iron occurs between the temperature ranges of

1400°C to 1530°C

600°C to 900°C

900°C to 1400°C

400°C to 600°C

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

Sulphur

Silicon

Phosphorus

Manganese

26. Stress relaxation is the phenomenon

In which parts are not loaded

Stress reduces on increasing load

In which stress remains constant on increasing load

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

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

Fixed structure at all temperatures

Atoms distributed in random pattern

Any one of the above

Different crystal structures at different temperatures

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

Recrystallization

Heat treatment

Precipitation

Allotropic change

29. Ferromagnetic alpha iron exists in temperature range of

1400 to 1539°C

Below 723°C

770 to 910°C

910 to 1440°C

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

Annealing

Carburising

Tempering

Normalizing

Page 4 of 4

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

Manganese

Phosphorus

Sulphur

Silicon

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

Optical microscope

Metallurgical microscope

Naked eye

X-ray techniques

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

Heat resisting steel

High speed steel

Invar

Stainless steel

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

RC 48

RC 57

RC 65

RC 80

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

Wrought iron

Cast iron

Mild steel

Brass

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

Silicon

Sulphur

Phosphorus

Manganese

37. Vanadium in high speed steels

Promotes decarburisation

Promotes retention of austenite

Provides high hot hardness

Forms very hard carbides and thus increases wear resistance

38. Connecting rod is, usually, made from

Medium carbon steel

Low carbon steel

High carbon steel

High speed steel

39. 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

40. Babbitt metal is a

Lead base alloy

Cadmium base alloy

Tin base alloy

Copper base alloy

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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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