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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

400°C to 600°C

600°C to 900°C

900°C to 1400°C

1400°C to 1530°C

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

Around 100°C

Around 0°C

Below 10°K

Above 100°K

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

Manganese

Phosphorus

Sulphur

Silicon

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

Sulphur

Phosphorus

Manganese

Silicon

5. Babbitt metal is a

Lead base alloy

Tin base alloy

Cadmium base alloy

Copper base alloy

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

Metallurgical microscope

X-ray techniques

Optical microscope

Naked eye

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

Gas turbine blades

Flywheel of steam engine

Cycle chains

Cast iron pipes

8. 1841 high speed steel contains

Vanadium 4%, chromium 18% and tungsten 1%

Vanadium 1%, chromium 4% and tungsten 18%

None of the above

Vanadium 18%, chromium 1% and tungsten 4%

9. Dye penetrant method is generally used to locate

Superficial defects

Core defects

Temporary defects

Surface defects

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

Normalizing

Carburising

Tempering

Annealing

Page 2 of 4

11. Silicon when added to copper improves

Hardness

Hardness and strength

Machinability

Strength and ductility

12. The metallic structure of mild steel is

Cubic structure

Hexagonal close packed

Body centered cubic

Face centered cubic

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

Zinc

Tin

Vanadium

Sulphur

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

Brittle fracture is always preceded by noise

Cup and cone formation is characteristic for brittle materials

High temperature and low strain rates favour brittle fracture

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

15. 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

Decrease

Increase

Remain same

16. Age-hardening is related with

Duralumin

Stainless steel

Gun metal

German silver

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

Phosphorus

Manganese

Silicon

Sulphur

18. Ferromagnetic alpha iron exists in temperature range of

1400 to 1539°C

Below 723°C

910 to 1440°C

770 to 910°C

19. Vanadium in high speed steels

Promotes retention of austenite

Promotes decarburisation

Provides high hot hardness

Forms very hard carbides and thus increases wear resistance

20. White cast iron contains carbon in the form of

Graphite

White carbon

Cementite

Free carbon

Page 3 of 4

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

Copper and tin

Copper and iron

Copper and nickel

Copper and zinc

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

60 : 40

50 : 50

20 : 80

40 : 60

23. Recrystallization temperature can be lowered by

All of the above

Working at lower temperature

Grain refinement

Purification of metal

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

Invar

High speed steel

Heat resisting steel

Stainless steel

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

Mild steel

Wrought iron

Brass

Cast iron

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

Allotropic change

Recrystallization

Heat treatment

Precipitation

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

RC 57

RC 80

RC 65

RC 48

28. Maximum percentage of carbon in austenite is

0.025%

0.8%

0.26%

1.7%

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

Constant for all metals

The points where there is no further flow of metal

The points of discontinuity

The points where no further change occurs

30. Which of the following statement is correct?

The product produced by blast-furnace is called cast iron

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

The cast iron has high tensile strength

The chilled cast iron has no graphite

Page 4 of 4

31. 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

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

Ductility

Hardness

Plasticity

Brittleness

33. Nodular iron has

High tensile strength

All of the above

High machinability

Low melting point

34. Wrought iron

Can be easily forged or welded

All of these

Is a ductile material

Cannot stand sudden and excessive shocks

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

Crystalline material

None of these

Amorphous material

Mesomorphous material

36. Connecting rod is, usually, made from

High carbon steel

High speed steel

Medium carbon steel

Low carbon steel

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

Toughness

Creep

Resilience

Fatigue strength

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

Any one of the above

Different crystal structures at different temperatures

Atoms distributed in random pattern

Fixed structure at all temperatures

39. 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

40. 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

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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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