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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. Silicon when added to copper improves

Hardness and strength

Machinability

Strength and ductility

Hardness

2. 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

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

60 : 40

50 : 50

40 : 60

20 : 80

4. Vanadium in high speed steels

Promotes decarburisation

Forms very hard carbides and thus increases wear resistance

Provides high hot hardness

Promotes retention of austenite

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

Gas turbine blades

Cycle chains

Cast iron pipes

Flywheel of steam engine

6. 1841 high speed steel contains

Vanadium 1%, chromium 4% and tungsten 18%

None of the above

Vanadium 18%, chromium 1% and tungsten 4%

Vanadium 4%, chromium 18% and tungsten 1%

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

RC 57

RC 80

RC 65

RC 48

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

Silicon

Manganese

Sulphur

Phosphorus

9. Which of the following statement is true about 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

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

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

Heat resisting steel

Stainless steel

Invar

High speed steel

Page 2 of 4

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

Decrease

Increase

Remain same

First increase and then decrease

12. Connecting rod is, usually, made from

Low carbon steel

High carbon steel

Medium carbon steel

High speed steel

13. Ferromagnetic alpha iron exists in temperature range of

910 to 1440°C

1400 to 1539°C

Below 723°C

770 to 910°C

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

The points where there is no further flow of metal

The points of discontinuity

Constant for all metals

The points where no further change occurs

15. Babbitt metal is a

Cadmium base alloy

Copper base alloy

Tin base alloy

Lead base alloy

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

X-ray techniques

Metallurgical microscope

Optical microscope

Naked eye

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

Toughness

Fatigue strength

Creep

Resilience

18. Stress relaxation is the phenomenon

In which parts are not loaded

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

In which stress remains constant on increasing load

Stress reduces on increasing load

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

Zinc

Vanadium

Tin

Sulphur

20. The metallic structure of mild steel is

Cubic structure

Body centered cubic

Hexagonal close packed

Face centered cubic

Page 3 of 4

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

Fixed structure at all temperatures

Different crystal structures at different temperatures

Atoms distributed in random pattern

Any one of the above

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

Copper and nickel

Copper and iron

Copper and tin

Copper and zinc

23. Inconel contains

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

65% nickel, 15% chromium and 20% iron

80% nickel and 20% chromium

80% nickel, 14% chromium and 6% iron

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

Sulphur

Silicon

Manganese

Phosphorus

25. Wrought iron

All of these

Is a ductile material

Can be easily forged or welded

Cannot stand sudden and excessive shocks

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

Hardness

Ductility

Brittleness

Plasticity

27. Maximum percentage of carbon in austenite is

0.8%

0.26%

0.025%

1.7%

28. Delta-iron occurs between the temperature ranges of

600°C to 900°C

400°C to 600°C

1400°C to 1530°C

900°C to 1400°C

29. Which of the following statement is correct?

The chilled cast iron has no graphite

The cast iron has high tensile strength

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

The product produced by blast-furnace is called cast iron

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

Phosphorus

Manganese

Sulphur

Silicon

Page 4 of 4

31. Dye penetrant method is generally used to locate

Surface defects

Temporary defects

Core defects

Superficial defects

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

None of these

Mesomorphous material

Crystalline material

Amorphous material

33. Age-hardening is related with

Gun metal

German silver

Duralumin

Stainless steel

34. Recrystallization temperature can be lowered by

Purification of metal

Grain refinement

All of the above

Working at lower temperature

35. Pig iron is the name given to

Iron in molten form in the ladles

Iron containing huge quantities of carbon

Raw material for blast furnace

Product of blast furnace made by reduction of iron ore

36. Nodular iron has

High machinability

All of the above

Low melting point

High tensile strength

37. White cast iron contains carbon in the form of

Cementite

White carbon

Graphite

Free carbon

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

Cast iron

Brass

Wrought iron

Mild steel

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

Above 100°K

Below 10°K

Around 0°C

Around 100°C

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

Carburising

Tempering

Normalizing

Annealing

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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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