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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. Age-hardening is related with

Gun metal

Duralumin

German silver

Stainless steel

2. Which of the following statement is correct?

The cast iron has high tensile strength

The product produced by blast-furnace is called cast iron

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

The chilled cast iron has no graphite

3. Delta-iron occurs between the temperature ranges of

600°C to 900°C

1400°C to 1530°C

900°C to 1400°C

400°C to 600°C

4. Pig iron is the name given to

Product of blast furnace made by reduction of iron ore

Raw material for blast furnace

Iron in molten form in the ladles

Iron containing huge quantities of carbon

5. The metallic structure of mild steel is

Face centered cubic

Body centered cubic

Hexagonal close packed

Cubic structure

6. Maximum percentage of carbon in austenite is

1.7%

0.8%

0.025%

0.26%

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

Sulphur

Manganese

Phosphorus

Silicon

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

50 : 50

60 : 40

20 : 80

40 : 60

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

Naked eye

Optical microscope

X-ray techniques

Metallurgical microscope

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

Brittleness

Hardness

Plasticity

Ductility

Page 2 of 4

11. Silicon when added to copper improves

Machinability

Hardness and strength

Hardness

Strength and ductility

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

Fatigue strength

Resilience

Creep

Toughness

13. Dye penetrant method is generally used to locate

Temporary defects

Surface defects

Core defects

Superficial defects

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

High speed steel

Stainless steel

Heat resisting steel

Invar

15. Ferromagnetic alpha iron exists in temperature range of

Below 723°C

770 to 910°C

1400 to 1539°C

910 to 1440°C

16. 1841 high speed steel contains

Vanadium 18%, chromium 1% and tungsten 4%

Vanadium 1%, chromium 4% and tungsten 18%

Vanadium 4%, chromium 18% and tungsten 1%

None of the above

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

Phosphorus

Manganese

Sulphur

Silicon

18. Babbitt metal is a

Tin base alloy

Cadmium base alloy

Copper base alloy

Lead base alloy

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

Remain same

Decrease

First increase and then decrease

Increase

20. Inconel contains

80% nickel and 20% chromium

65% nickel, 15% chromium and 20% iron

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

80% nickel, 14% chromium and 6% iron

Page 3 of 4

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

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

High temperature and low strain rates favour brittle fracture

Brittle fracture is always preceded by noise

Cup and cone formation is characteristic for brittle materials

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

Flywheel of steam engine

Cycle chains

Cast iron pipes

Gas turbine blades

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

Wrought iron

Brass

Mild steel

Cast iron

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

RC 57

RC 48

RC 65

RC 80

25. Nodular iron has

All of the above

High tensile strength

Low melting point

High machinability

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

Any one of the above

Fixed structure at all temperatures

Different crystal structures at different temperatures

Atoms distributed in random pattern

27. Vanadium in high speed steels

Promotes decarburisation

Promotes retention of austenite

Forms very hard carbides and thus increases wear resistance

Provides high hot hardness

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

Copper and tin

Copper and zinc

Copper and nickel

Copper and iron

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

Vanadium

Tin

Sulphur

Zinc

30. Connecting rod is, usually, made from

High carbon steel

Medium carbon steel

High speed steel

Low carbon steel

Page 4 of 4

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

Heat treatment

Allotropic change

Recrystallization

Precipitation

32. 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

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

Below 10°K

Around 0°C

Above 100°K

Around 100°C

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

Crystalline material

Mesomorphous material

Amorphous material

None of these

35. Stress relaxation is the phenomenon

In which parts are not loaded

In which stress remains constant on increasing load

Stress reduces on increasing load

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

36. White cast iron contains carbon in the form of

Free carbon

Cementite

White carbon

Graphite

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

Tempering

Carburising

Normalizing

Annealing

38. Recrystallization temperature can be lowered by

All of the above

Grain refinement

Working at lower temperature

Purification of metal

39. Wrought iron

Cannot stand sudden and excessive shocks

Can be easily forged or welded

Is a ductile material

All of these

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

Sulphur

Phosphorus

Silicon

Manganese

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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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