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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. Maximum percentage of carbon in austenite is

1.7%

0.025%

0.8%

0.26%

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

Annealing

Carburising

Tempering

Normalizing

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

Phosphorus

Manganese

Silicon

Sulphur

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

Precipitation

Recrystallization

Heat treatment

Allotropic change

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

Silicon

Sulphur

Manganese

Phosphorus

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

Brass

Wrought iron

Mild steel

Cast iron

7. Ferromagnetic alpha iron exists in temperature range of

770 to 910°C

1400 to 1539°C

910 to 1440°C

Below 723°C

8. Connecting rod is, usually, made from

High speed steel

Medium carbon steel

High carbon steel

Low carbon steel

9. Age-hardening is related with

Gun metal

Duralumin

German silver

Stainless steel

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

Around 0°C

Below 10°K

Above 100°K

Around 100°C

Page 2 of 4

11. 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 product produced by blast-furnace is called cast iron

The chilled cast iron has no graphite

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

Invar

Heat resisting steel

High speed steel

Stainless steel

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

Brittle fracture is always preceded by noise

High temperature and low strain rates favour brittle fracture

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

Cup and cone formation is characteristic for brittle materials

14. Nodular iron has

All of the above

High machinability

Low melting point

High tensile strength

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

Copper and iron

Copper and tin

Copper and nickel

Copper and zinc

16. 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

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

Sulphur

Manganese

Phosphorus

Silicon

18. Vanadium in high speed steels

Forms very hard carbides and thus increases wear resistance

Promotes decarburisation

Promotes retention of austenite

Provides high hot hardness

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

Optical microscope

X-ray techniques

Metallurgical microscope

Naked eye

20. Babbitt metal is a

Tin base alloy

Lead base alloy

Copper base alloy

Cadmium base alloy

Page 3 of 4

21. The metallic structure of mild steel is

Face centered cubic

Body centered cubic

Hexagonal close packed

Cubic structure

22. Stress relaxation is the phenomenon

Stress reduces on increasing load

In which stress remains constant on increasing load

In which parts are not loaded

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

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

Cast iron pipes

Cycle chains

Flywheel of steam engine

Gas turbine blades

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

Plasticity

Hardness

Brittleness

Ductility

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

Amorphous material

None of these

Crystalline material

Mesomorphous material

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

Different crystal structures at different temperatures

Fixed structure at all temperatures

Atoms distributed in random pattern

Any one of the above

27. 1841 high speed steel contains

Vanadium 18%, chromium 1% and tungsten 4%

None of the above

Vanadium 1%, chromium 4% and tungsten 18%

Vanadium 4%, chromium 18% and tungsten 1%

28. Wrought iron

Cannot stand sudden and excessive shocks

Is a ductile material

All of these

Can be easily forged or welded

29. Inconel contains

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

80% nickel and 20% chromium

80% nickel, 14% chromium and 6% iron

65% nickel, 15% chromium and 20% iron

30. Pig iron is the name given to

Raw material for blast furnace

Iron containing huge quantities of carbon

Iron in molten form in the ladles

Product of blast furnace made by reduction of iron ore

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

Remain same

Increase

First increase and then decrease

Decrease

32. Silicon when added to copper improves

Hardness and strength

Strength and ductility

Hardness

Machinability

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

Vanadium

Tin

Sulphur

Zinc

34. Delta-iron occurs between the temperature ranges of

900°C to 1400°C

400°C to 600°C

600°C to 900°C

1400°C to 1530°C

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

RC 80

RC 65

RC 48

RC 57

36. White cast iron contains carbon in the form of

Graphite

White carbon

Free carbon

Cementite

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

40 : 60

20 : 80

60 : 40

50 : 50

38. Dye penetrant method is generally used to locate

Core defects

Superficial defects

Temporary defects

Surface defects

39. Recrystallization temperature can be lowered by

Grain refinement

Purification of metal

Working at lower temperature

All of the above

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

Toughness

Creep

Fatigue strength

Resilience

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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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