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Engineering Materials
0

Engineering Materials Practice Set-4

May 10, 2021

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Page 1 of 4

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

X-ray techniques

Naked eye

Optical microscope

Metallurgical microscope

2. Recrystallization temperature can be lowered by

All of the above

Grain refinement

Working at lower temperature

Purification of metal

3. White cast iron contains carbon in the form of

Cementite

Graphite

White carbon

Free carbon

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

Increase

Remain same

Decrease

First increase and then decrease

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

Resilience

Fatigue strength

Toughness

Creep

6. Silicon when added to copper improves

Strength and ductility

Hardness and strength

Machinability

Hardness

7. Connecting rod is, usually, made from

Low carbon steel

Medium carbon steel

High carbon steel

High speed steel

8. Ferromagnetic alpha iron exists in temperature range of

910 to 1440°C

1400 to 1539°C

770 to 910°C

Below 723°C

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

Atoms distributed in random pattern

Any one of the above

Fixed structure at all temperatures

Different crystal structures at different temperatures

10. Vanadium in high speed steels

Provides high hot hardness

Promotes retention of austenite

Promotes decarburisation

Forms very hard carbides and thus increases wear resistance

Page 2 of 4

11. Age-hardening is related with

Stainless steel

German silver

Gun metal

Duralumin

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

Cycle chains

Cast iron pipes

Gas turbine blades

Flywheel of steam engine

13. 1841 high speed steel contains

Vanadium 4%, chromium 18% and tungsten 1%

None of the above

Vanadium 18%, chromium 1% and tungsten 4%

Vanadium 1%, chromium 4% and tungsten 18%

14. 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

Cup and cone formation is characteristic for brittle materials

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

15. The metallic structure of mild steel is

Hexagonal close packed

Cubic structure

Face centered cubic

Body centered cubic

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

Carburising

Tempering

Normalizing

Annealing

17. Nodular iron has

Low melting point

High machinability

High tensile strength

All of the above

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

None of these

Amorphous material

Mesomorphous material

Crystalline material

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

Manganese

Sulphur

Phosphorus

Silicon

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

Copper and iron

Copper and nickel

Copper and tin

Copper and zinc

Page 3 of 4

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

Mild steel

Brass

Wrought iron

Cast iron

22. Babbitt metal is a

Lead base alloy

Tin base alloy

Copper base alloy

Cadmium base alloy

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

RC 48

RC 80

RC 57

RC 65

24. Dye penetrant method is generally used to locate

Temporary defects

Superficial defects

Surface defects

Core defects

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

Around 0°C

Above 100°K

Below 10°K

Around 100°C

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

Sulphur

Phosphorus

Manganese

Silicon

27. 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

28. Delta-iron occurs between the temperature ranges of

900°C to 1400°C

600°C to 900°C

1400°C to 1530°C

400°C to 600°C

29. Stress relaxation is the phenomenon

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

Stress reduces on increasing load

In which stress remains constant on increasing load

In which parts are not loaded

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

Recrystallization

Precipitation

Allotropic change

Heat treatment

Page 4 of 4

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

Vanadium

Tin

Sulphur

Zinc

32. Wrought iron

Cannot stand sudden and excessive shocks

All of these

Is a ductile material

Can be easily forged or welded

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

20 : 80

60 : 40

50 : 50

40 : 60

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

Heat resisting steel

High speed steel

Stainless steel

Invar

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

Phosphorus

Sulphur

Silicon

Manganese

36. Maximum percentage of carbon in austenite is

0.26%

1.7%

0.025%

0.8%

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

Plasticity

Hardness

Ductility

Brittleness

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

The points where no further change occurs

Constant for all metals

The points of discontinuity

The points where there is no further flow of metal

39. Inconel contains

80% nickel and 20% chromium

80% nickel, 14% chromium and 6% iron

65% nickel, 15% chromium and 20% iron

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

40. Which of the following statement is correct?

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

The product produced by blast-furnace is called cast iron

The cast iron has high tensile strength

The chilled cast iron has no graphite

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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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