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

Heat treatment

Allotropic change

Precipitation

Recrystallization

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

Invar

Stainless steel

High speed steel

Heat resisting steel

3. 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 pig iron is the name given to the product produced by cupola

The chilled cast iron has no graphite

4. 1841 high speed steel contains

Vanadium 4%, chromium 18% and tungsten 1%

Vanadium 1%, chromium 4% and tungsten 18%

None of the above

Vanadium 18%, chromium 1% and tungsten 4%

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

Constant for all metals

The points of discontinuity

The points where there is no further flow of metal

The points where no further change occurs

6. Pig iron is the name given to

Product of blast furnace made by reduction of iron ore

Raw material for blast furnace

Iron containing huge quantities of carbon

Iron in molten form in the ladles

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

Sulphur

Manganese

Silicon

Phosphorus

8. The metallic structure of mild steel is

Hexagonal close packed

Face centered cubic

Body centered cubic

Cubic structure

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

Vanadium

Tin

Zinc

Sulphur

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

X-ray techniques

Naked eye

Optical microscope

Metallurgical microscope

Page 2 of 4

11. Wrought iron

Can be easily forged or welded

Is a ductile material

All of these

Cannot stand sudden and excessive shocks

12. Ferromagnetic alpha iron exists in temperature range of

770 to 910°C

1400 to 1539°C

Below 723°C

910 to 1440°C

13. Connecting rod is, usually, made from

High speed steel

High carbon steel

Low carbon steel

Medium carbon steel

14. Vanadium in high speed steels

Forms very hard carbides and thus increases wear resistance

Promotes retention of austenite

Provides high hot hardness

Promotes decarburisation

15. Stress relaxation is the phenomenon

In which parts are not loaded

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

16. Age-hardening is related with

Duralumin

Gun metal

Stainless steel

German silver

17. Delta-iron occurs between the temperature ranges of

1400°C to 1530°C

400°C to 600°C

900°C to 1400°C

600°C to 900°C

18. Inconel contains

65% nickel, 15% chromium and 20% iron

80% nickel and 20% chromium

80% nickel, 14% chromium and 6% iron

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

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

60 : 40

20 : 80

50 : 50

40 : 60

20. Nodular iron has

High tensile strength

Low melting point

High machinability

All of the above

Page 3 of 4

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

Normalizing

Carburising

Annealing

Tempering

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

Around 0°C

Below 10°K

Around 100°C

Above 100°K

23. Babbitt metal is a

Cadmium base alloy

Copper base alloy

Tin base alloy

Lead base alloy

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

Hardness

Plasticity

Ductility

Brittleness

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

Copper and zinc

Copper and tin

Copper and nickel

Copper and iron

26. Silicon when added to copper improves

Hardness and strength

Machinability

Strength and ductility

Hardness

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

RC 57

RC 65

RC 80

RC 48

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

First increase and then decrease

Increase

Decrease

Remain same

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

Amorphous material

Crystalline material

None of these

Mesomorphous material

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

Atoms distributed in random pattern

Fixed structure at all temperatures

Different crystal structures at different temperatures

Any one of the above

Page 4 of 4

31. White cast iron contains carbon in the form of

Free carbon

White carbon

Cementite

Graphite

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

Gas turbine blades

Cast iron pipes

Flywheel of steam engine

Cycle chains

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

Phosphorus

Manganese

Sulphur

Silicon

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

High temperature and low strain rates favour brittle fracture

Cup and cone formation is characteristic for brittle materials

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

Brittle fracture is always preceded by noise

35. Dye penetrant method is generally used to locate

Temporary defects

Superficial defects

Surface defects

Core defects

36. Recrystallization temperature can be lowered by

Grain refinement

Working at lower temperature

Purification of metal

All of the above

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

Sulphur

Phosphorus

Silicon

Manganese

38. Maximum percentage of carbon in austenite is

0.025%

0.8%

1.7%

0.26%

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

Creep

Resilience

Fatigue strength

Toughness

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

Brass

Mild steel

Wrought iron

Cast iron

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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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