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

The points where there is no further flow of metal

The points where no further change occurs

The points of discontinuity

Constant for all metals

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

Mesomorphous material

None of these

Crystalline material

Amorphous material

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

Below 10°K

Above 100°K

Around 100°C

Around 0°C

4. Vanadium in high speed steels

Promotes decarburisation

Provides high hot hardness

Promotes retention of austenite

Forms very hard carbides and thus increases wear resistance

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

Cast iron pipes

Flywheel of steam engine

Gas turbine blades

Cycle chains

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

Invar

Heat resisting steel

Stainless steel

High speed steel

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

Zinc

Sulphur

Tin

Vanadium

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

40 : 60

50 : 50

60 : 40

20 : 80

9. Age-hardening is related with

Duralumin

Stainless steel

German silver

Gun metal

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

RC 80

RC 48

RC 57

RC 65

Page 2 of 4

11. Pig iron is the name given to

Product of blast furnace made by reduction of iron ore

Iron in molten form in the ladles

Iron containing huge quantities of carbon

Raw material for blast furnace

12. Inconel contains

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

80% nickel, 14% chromium and 6% iron

80% nickel and 20% chromium

65% nickel, 15% chromium and 20% iron

13. White cast iron contains carbon in the form of

Free carbon

White carbon

Graphite

Cementite

14. The metallic structure of mild steel is

Body centered cubic

Hexagonal close packed

Face centered cubic

Cubic structure

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

Copper and tin

Copper and zinc

Copper and nickel

Copper and iron

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

X-ray techniques

Optical microscope

Metallurgical microscope

Naked eye

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

Resilience

Creep

Fatigue strength

Toughness

18. Stress relaxation is the phenomenon

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

In which parts are not loaded

In which stress remains constant on increasing load

Stress reduces on increasing load

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

Hardness

Ductility

Plasticity

Brittleness

20. 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

Increase

Remain same

Decrease

Page 3 of 4

21. 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

22. Ferromagnetic alpha iron exists in temperature range of

770 to 910°C

Below 723°C

1400 to 1539°C

910 to 1440°C

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

Cast iron

Mild steel

Brass

Wrought iron

24. 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

25. 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 cast iron has high tensile strength

The product produced by blast-furnace is called cast iron

26. Maximum percentage of carbon in austenite is

0.025%

0.26%

0.8%

1.7%

27. Wrought iron

Cannot stand sudden and excessive shocks

All of these

Is a ductile material

Can be easily forged or welded

28. 1841 high speed steel contains

None of the above

Vanadium 18%, chromium 1% and tungsten 4%

Vanadium 1%, chromium 4% and tungsten 18%

Vanadium 4%, chromium 18% and tungsten 1%

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

Carburising

Annealing

Normalizing

Tempering

30. 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

Page 4 of 4

31. Silicon when added to copper improves

Machinability

Strength and ductility

Hardness

Hardness and strength

32. Dye penetrant method is generally used to locate

Superficial defects

Core defects

Surface defects

Temporary defects

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

Manganese

Sulphur

Silicon

Phosphorus

34. Recrystallization temperature can be lowered by

All of the above

Purification of metal

Working at lower temperature

Grain refinement

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

Fixed structure at all temperatures

Any one of the above

Atoms distributed in random pattern

Different crystal structures at different temperatures

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

Silicon

Phosphorus

Manganese

Sulphur

37. Babbitt metal is a

Tin base alloy

Cadmium base alloy

Lead base alloy

Copper base alloy

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

Phosphorus

Sulphur

Manganese

Silicon

39. Connecting rod is, usually, made from

High carbon steel

Low carbon steel

Medium carbon steel

High speed steel

40. Nodular iron has

High tensile strength

Low melting point

High machinability

All of the above

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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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