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Engineering Materials
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Engineering Materials Practice Set-4

May 10, 2021

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25%

Page 1 of 4

1. Maximum percentage of carbon in austenite is

1.7%

0.025%

0.8%

0.26%

2. Pig iron is the name given to

Iron containing huge quantities of carbon

Product of blast furnace made by reduction of iron ore

Iron in molten form in the ladles

Raw material for blast furnace

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

Tempering

Carburising

Normalizing

Annealing

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

Creep

Resilience

Toughness

Fatigue strength

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

60 : 40

50 : 50

20 : 80

40 : 60

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

RC 48

RC 57

RC 65

RC 80

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

Manganese

Phosphorus

Silicon

Sulphur

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

Atoms distributed in random pattern

Different crystal structures at different temperatures

Fixed structure at all temperatures

Any one of the above

9. Age-hardening is related with

Stainless steel

German silver

Gun metal

Duralumin

10. Nodular iron has

High machinability

High tensile strength

All of the above

Low melting point

Page 2 of 4

11. Wrought iron

Cannot stand sudden and excessive shocks

Is a ductile material

All of these

Can be easily forged or welded

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

Below 10°K

Around 100°C

Around 0°C

Above 100°K

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

Brass

Mild steel

Wrought iron

Cast iron

14. The metallic structure of mild steel is

Cubic structure

Body centered cubic

Hexagonal close packed

Face centered cubic

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

Plasticity

Brittleness

Hardness

Ductility

16. Which of the following statement is correct?

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

The cast iron has high tensile strength

The chilled cast iron has no graphite

The product produced by blast-furnace is called cast iron

17. Inconel contains

65% nickel, 15% chromium and 20% iron

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

80% nickel and 20% chromium

80% nickel, 14% chromium and 6% iron

18. Stress relaxation is the phenomenon

In which stress remains constant on increasing load

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

In which parts are not loaded

Stress reduces on increasing load

19. 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

20. Recrystallization temperature can be lowered by

Working at lower temperature

Purification of metal

Grain refinement

All of the above

Page 3 of 4

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

High speed steel

Invar

Stainless steel

Heat resisting steel

22. 1841 high speed steel contains

Vanadium 1%, chromium 4% and tungsten 18%

None of the above

Vanadium 4%, chromium 18% and tungsten 1%

Vanadium 18%, chromium 1% and tungsten 4%

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

Tin

Vanadium

Zinc

Sulphur

24. Connecting rod is, usually, made from

Medium carbon steel

High carbon steel

High speed steel

Low carbon steel

25. Silicon when added to copper improves

Hardness and strength

Hardness

Machinability

Strength and ductility

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

Manganese

Phosphorus

Sulphur

Silicon

27. Delta-iron occurs between the temperature ranges of

400°C to 600°C

600°C to 900°C

900°C to 1400°C

1400°C to 1530°C

28. Babbitt metal is a

Lead base alloy

Copper base alloy

Cadmium base alloy

Tin base alloy

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

Copper and iron

Copper and nickel

Copper and tin

Copper and zinc

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

Metallurgical microscope

Optical microscope

Naked eye

X-ray techniques

Page 4 of 4

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

Decrease

First increase and then decrease

Increase

Remain same

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

Mesomorphous material

None of these

Amorphous material

Crystalline material

33. Vanadium in high speed steels

Promotes decarburisation

Forms very hard carbides and thus increases wear resistance

Promotes retention of austenite

Provides high hot hardness

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

Flywheel of steam engine

Cast iron pipes

Cycle chains

Gas turbine blades

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

Allotropic change

Heat treatment

Recrystallization

Precipitation

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

Manganese

Phosphorus

Sulphur

Silicon

37. Dye penetrant method is generally used to locate

Surface defects

Temporary defects

Superficial defects

Core defects

38. Ferromagnetic alpha iron exists in temperature range of

770 to 910°C

1400 to 1539°C

Below 723°C

910 to 1440°C

39. White cast iron contains carbon in the form of

White carbon

Free carbon

Cementite

Graphite

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

Constant for all metals

The points where no further change occurs

The points of discontinuity

The points where there is no further flow of metal

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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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