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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. Delta-iron occurs between the temperature ranges of

900°C to 1400°C

400°C to 600°C

1400°C to 1530°C

600°C to 900°C

2. Babbitt metal is a

Lead base alloy

Tin base alloy

Copper base alloy

Cadmium base alloy

3. Maximum percentage of carbon in austenite is

0.26%

0.8%

0.025%

1.7%

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

High speed steel

Stainless steel

Heat resisting steel

Invar

5. The metallic structure of mild steel is

Hexagonal close packed

Cubic structure

Body centered cubic

Face centered cubic

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

40 : 60

60 : 40

20 : 80

50 : 50

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

Resilience

Toughness

Creep

Fatigue strength

8. Recrystallization temperature can be lowered by

Grain refinement

All of the above

Purification of metal

Working at lower temperature

9. White cast iron contains carbon in the form of

Free carbon

White carbon

Graphite

Cementite

10. Stress relaxation is the phenomenon

In which parts are not loaded

Stress reduces on increasing load

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

In which stress remains constant on increasing load

Page 2 of 4

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

Manganese

Phosphorus

Sulphur

Silicon

12. Ferromagnetic alpha iron exists in temperature range of

770 to 910°C

1400 to 1539°C

910 to 1440°C

Below 723°C

13. Which of the following statement is correct?

The chilled cast iron has no graphite

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

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

Copper and tin

Copper and iron

Copper and zinc

Copper and nickel

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

Heat treatment

Precipitation

Allotropic change

Recrystallization

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

Different crystal structures at different temperatures

Atoms distributed in random pattern

Any one of the above

Fixed structure at all temperatures

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

RC 65

RC 57

RC 48

RC 80

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

Flywheel of steam engine

Cycle chains

Cast iron pipes

Gas turbine blades

19. Dye penetrant method is generally used to locate

Surface defects

Temporary defects

Superficial defects

Core defects

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

Cast iron

Brass

Wrought iron

Mild steel

Page 3 of 4

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

The points of discontinuity

The points where no further change occurs

The points where there is no further flow of metal

Constant for all metals

22. Wrought iron

Cannot stand sudden and excessive shocks

Can be easily forged or welded

All of these

Is a ductile material

23. 1841 high speed steel contains

Vanadium 18%, chromium 1% and tungsten 4%

Vanadium 4%, chromium 18% and tungsten 1%

Vanadium 1%, chromium 4% and tungsten 18%

None of the above

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

Manganese

Silicon

Phosphorus

Sulphur

25. Nodular iron has

High machinability

Low melting point

High tensile strength

All of the above

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

Optical microscope

X-ray techniques

Naked eye

Metallurgical microscope

27. Connecting rod is, usually, made from

Medium carbon steel

Low carbon steel

High carbon steel

High speed steel

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

Brittleness

Ductility

Hardness

Plasticity

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

Around 0°C

Below 10°K

Above 100°K

Around 100°C

30. Age-hardening is related with

Gun metal

Duralumin

Stainless steel

German silver

Page 4 of 4

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

Normalizing

Annealing

Tempering

Carburising

32. Inconel contains

80% nickel and 20% chromium

80% nickel, 14% chromium and 6% iron

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

65% nickel, 15% chromium and 20% iron

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

Mesomorphous material

Crystalline material

Amorphous material

None of these

34. Silicon when added to copper improves

Hardness

Hardness and strength

Strength and ductility

Machinability

35. 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

Cup and cone formation is characteristic for brittle materials

Brittle fracture is always preceded by noise

36. Pig iron is the name given to

Raw material for blast furnace

Product of blast furnace made by reduction of iron ore

Iron in molten form in the ladles

Iron containing huge quantities of carbon

37. Vanadium in high speed steels

Forms very hard carbides and thus increases wear resistance

Promotes decarburisation

Provides high hot hardness

Promotes retention of austenite

38. 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

Remain same

Increase

Decrease

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

Tin

Sulphur

Zinc

Vanadium

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

Silicon

Phosphorus

Manganese

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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