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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. Ferromagnetic alpha iron exists in temperature range of

1400 to 1539°C

910 to 1440°C

Below 723°C

770 to 910°C

2. Connecting rod is, usually, made from

Low carbon steel

High carbon steel

Medium carbon steel

High speed steel

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

Brittleness

Ductility

Hardness

Plasticity

4. Delta-iron occurs between the temperature ranges of

600°C to 900°C

900°C to 1400°C

1400°C to 1530°C

400°C to 600°C

5. 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 parts are not loaded

In which stress remains constant on increasing load

6. 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

7. Maximum percentage of carbon in austenite is

0.26%

0.025%

1.7%

0.8%

8. The metallic structure of mild steel is

Cubic structure

Body centered cubic

Face centered cubic

Hexagonal close packed

9. Recrystallization temperature can be lowered by

Grain refinement

Purification of metal

Working at lower temperature

All of the above

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

Amorphous material

Mesomorphous material

Crystalline material

None of these

Page 2 of 4

11. Pig iron is the name given to

Iron containing huge quantities of carbon

Iron in molten form in the ladles

Product of blast furnace made by reduction of iron ore

Raw material for blast furnace

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

Vanadium

Sulphur

Zinc

Tin

13. Babbitt metal is a

Cadmium base alloy

Lead base alloy

Tin base alloy

Copper base alloy

14. Wrought iron

Cannot stand sudden and excessive shocks

Is a ductile material

All of these

Can be easily forged or welded

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

Metallurgical microscope

Naked eye

Optical microscope

X-ray techniques

16. Nodular iron has

All of the above

High machinability

High tensile strength

Low melting point

17. White cast iron contains carbon in the form of

White carbon

Cementite

Free carbon

Graphite

18. Silicon when added to copper improves

Hardness

Machinability

Strength and ductility

Hardness and strength

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

Cycle chains

Flywheel of steam engine

Gas turbine blades

Cast iron pipes

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

Creep

Resilience

Toughness

Fatigue strength

Page 3 of 4

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

Copper and iron

Copper and nickel

Copper and tin

Copper and zinc

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

Allotropic change

Recrystallization

Heat treatment

Precipitation

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

Manganese

Silicon

Sulphur

Phosphorus

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

Remain same

Decrease

Increase

First increase and then decrease

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

Carburising

Annealing

Tempering

Normalizing

26. 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

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

50 : 50

20 : 80

60 : 40

40 : 60

28. Vanadium in high speed steels

Provides high hot hardness

Promotes decarburisation

Forms very hard carbides and thus increases wear resistance

Promotes retention of austenite

29. Which of the following statement is correct?

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

The cast iron has high tensile strength

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

Cup and cone formation is characteristic for brittle materials

Brittle fracture is always preceded by noise

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

High temperature and low strain rates favour brittle fracture

Page 4 of 4

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

Around 0°C

Below 10°K

Above 100°K

Around 100°C

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

Invar

Stainless steel

High speed steel

Heat resisting steel

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

RC 57

RC 48

RC 65

RC 80

34. Age-hardening is related with

German silver

Duralumin

Stainless steel

Gun metal

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

The points where no further change occurs

The points where there is no further flow of metal

The points of discontinuity

Constant for all metals

36. 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%

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

Manganese

Phosphorus

Sulphur

Silicon

38. Dye penetrant method is generally used to locate

Surface defects

Superficial defects

Core defects

Temporary defects

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

Manganese

Phosphorus

Silicon

Sulphur

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

Wrought iron

Cast iron

Mild steel

Brass

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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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