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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. Stress relaxation is the phenomenon

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

In which parts are not loaded

Stress reduces on increasing load

In which stress remains constant on increasing load

2. Vanadium in high speed steels

Forms very hard carbides and thus increases wear resistance

Provides high hot hardness

Promotes retention of austenite

Promotes decarburisation

3. Nodular iron has

High tensile strength

All of the above

High machinability

Low melting point

4. Babbitt metal is a

Tin base alloy

Copper base alloy

Lead base alloy

Cadmium base alloy

5. Age-hardening is related with

Stainless steel

German silver

Gun metal

Duralumin

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

Copper and tin

Copper and iron

Copper and zinc

Copper and nickel

7. 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

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

Brass

Cast iron

Mild steel

Wrought iron

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

Resilience

Fatigue strength

Creep

Toughness

10. Pig iron is the name given to

Raw material for blast furnace

Iron containing huge quantities of carbon

Product of blast furnace made by reduction of iron ore

Iron in molten form in the ladles

Page 2 of 4

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

Zinc

Tin

Sulphur

Vanadium

12. Maximum percentage of carbon in austenite is

0.025%

0.8%

1.7%

0.26%

13. 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

14. Dye penetrant method is generally used to locate

Superficial defects

Surface defects

Temporary defects

Core defects

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

Metallurgical microscope

Optical microscope

X-ray techniques

Naked eye

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

The points where no further change occurs

The points where there is no further flow of metal

The points of discontinuity

Constant for all metals

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

Manganese

Sulphur

Silicon

Phosphorus

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

Around 100°C

Above 100°K

Below 10°K

Around 0°C

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

40 : 60

50 : 50

60 : 40

20 : 80

20. Ferromagnetic alpha iron exists in temperature range of

1400 to 1539°C

Below 723°C

770 to 910°C

910 to 1440°C

Page 3 of 4

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

Stainless steel

Heat resisting steel

Invar

High speed steel

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

RC 48

RC 80

RC 65

RC 57

23. Connecting rod is, usually, made from

Low carbon steel

Medium carbon steel

High carbon steel

High speed steel

24. 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

Remain same

Decrease

Increase

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

Phosphorus

Sulphur

Silicon

Manganese

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

Flywheel of steam engine

Cycle chains

Gas turbine blades

Cast iron pipes

27. The metallic structure of mild steel is

Face centered cubic

Hexagonal close packed

Cubic structure

Body centered cubic

28. Silicon when added to copper improves

Hardness

Machinability

Strength and ductility

Hardness and strength

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

Amorphous material

None of these

Mesomorphous material

Crystalline material

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

Manganese

Silicon

Phosphorus

Sulphur

Page 4 of 4

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

Hardness

Ductility

Plasticity

Brittleness

32. Wrought iron

Is a ductile material

All of these

Cannot stand sudden and excessive shocks

Can be easily forged or welded

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

Cup and cone formation is characteristic for brittle materials

High temperature and low strain rates favour brittle fracture

Brittle fracture is always preceded by noise

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

34. Delta-iron occurs between the temperature ranges of

900°C to 1400°C

1400°C to 1530°C

400°C to 600°C

600°C to 900°C

35. Which of the following statement is correct?

The cast iron has high tensile strength

The product produced by blast-furnace is called cast iron

The chilled cast iron has no graphite

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

36. Inconel contains

65% nickel, 15% chromium and 20% iron

80% nickel and 20% chromium

80% nickel, 14% chromium and 6% iron

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

37. White cast iron contains carbon in the form of

White carbon

Cementite

Graphite

Free carbon

38. 1841 high speed steel contains

Vanadium 18%, chromium 1% and tungsten 4%

None of the above

Vanadium 4%, chromium 18% and tungsten 1%

Vanadium 1%, chromium 4% and tungsten 18%

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

Annealing

Tempering

Carburising

Normalizing

40. Recrystallization temperature can be lowered by

All of the above

Grain refinement

Purification of metal

Working at lower temperature

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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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