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

None of these

Crystalline material

Amorphous material

Mesomorphous material

2. Vanadium in high speed steels

Promotes retention of austenite

Forms very hard carbides and thus increases wear resistance

Promotes decarburisation

Provides high hot hardness

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

Ductility

Hardness

Plasticity

Brittleness

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

20 : 80

50 : 50

60 : 40

40 : 60

5. Babbitt metal is a

Tin base alloy

Copper base alloy

Lead base alloy

Cadmium base alloy

6. 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

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

Brittle fracture is always preceded by noise

7. Wrought iron

Can be easily forged or welded

Cannot stand sudden and excessive shocks

Is a ductile material

All of these

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

Wrought iron

Mild steel

Brass

Cast iron

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

Above 100°K

Around 100°C

Around 0°C

Below 10°K

10. Pig iron is the name given to

Raw material for blast furnace

Iron containing huge quantities of carbon

Product of blast furnace made by reduction of iron ore

Iron in molten form in the ladles

Page 2 of 4

11. Silicon when added to copper improves

Machinability

Strength and ductility

Hardness and strength

Hardness

12. The metallic structure of mild steel is

Face centered cubic

Cubic structure

Hexagonal close packed

Body centered cubic

13. Maximum percentage of carbon in austenite is

0.8%

0.26%

0.025%

1.7%

14. 1841 high speed steel contains

None of the above

Vanadium 4%, chromium 18% and tungsten 1%

Vanadium 1%, chromium 4% and tungsten 18%

Vanadium 18%, chromium 1% and tungsten 4%

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

Remain same

Increase

First increase and then decrease

Decrease

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

High speed steel

Stainless steel

Heat resisting steel

Invar

17. Age-hardening is related with

Stainless steel

German silver

Gun metal

Duralumin

18. White cast iron contains carbon in the form of

Free carbon

Graphite

White carbon

Cementite

19. Recrystallization temperature can be lowered by

Grain refinement

All of the above

Purification of metal

Working at lower temperature

20. Ferromagnetic alpha iron exists in temperature range of

1400 to 1539°C

910 to 1440°C

770 to 910°C

Below 723°C

Page 3 of 4

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

Gas turbine blades

Cycle chains

Flywheel of steam engine

Cast iron pipes

22. 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

23. Stress relaxation is the phenomenon

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

Stress reduces on increasing load

In which stress remains constant on increasing load

In which parts are not loaded

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

Any one of the above

Different crystal structures at different temperatures

Atoms distributed in random pattern

Fixed structure at all temperatures

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

Carburising

Tempering

Normalizing

Annealing

26. Inconel contains

65% nickel, 15% chromium and 20% iron

80% nickel and 20% chromium

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

80% nickel, 14% chromium and 6% iron

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

Metallurgical microscope

Optical microscope

Naked eye

X-ray techniques

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

Sulphur

Manganese

Phosphorus

Silicon

29. Which of the following statement is correct?

The cast iron has high tensile strength

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

The product produced by blast-furnace is called cast iron

The chilled cast iron has no graphite

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

Copper and zinc

Copper and iron

Copper and nickel

Copper and tin

Page 4 of 4

31. Dye penetrant method is generally used to locate

Superficial defects

Surface defects

Temporary defects

Core defects

32. Nodular iron has

Low melting point

High tensile strength

High machinability

All of the above

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

The points where there is no further flow of metal

Constant for all metals

The points where no further change occurs

The points of discontinuity

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

Phosphorus

Sulphur

Manganese

Silicon

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

Phosphorus

Sulphur

Silicon

Manganese

36. Connecting rod is, usually, made from

Low carbon steel

High speed steel

High carbon steel

Medium carbon steel

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

Recrystallization

Precipitation

Allotropic change

Heat treatment

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

RC 80

RC 57

RC 48

RC 65

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

Creep

Fatigue strength

Resilience

Toughness

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

Tin

Zinc

Vanadium

Sulphur

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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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