Engineering Materials Practice Set-4

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

Atoms distributed in random pattern

Different crystal structures at different temperatures

Fixed structure at all temperatures

Any one of the above

2. Ferromagnetic alpha iron exists in temperature range of

770 to 910°C

910 to 1440°C

1400 to 1539°C

Below 723°C

3. 1841 high speed steel contains

Vanadium 18%, chromium 1% and tungsten 4%

Vanadium 4%, chromium 18% and tungsten 1%

Vanadium 1%, chromium 4% and tungsten 18%

None of the above

4. Recrystallization temperature can be lowered by

Grain refinement

Working at lower temperature

All of the above

Purification of metal

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

High speed steel

Invar

Stainless steel

Heat resisting steel

6. Inconel contains

80% nickel, 14% chromium and 6% iron

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

80% nickel and 20% chromium

65% nickel, 15% chromium and 20% iron

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

The points where no further change occurs

The points of discontinuity

The points where there is no further flow of metal

Constant for all metals

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

The cast iron has high tensile strength

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

Vanadium

Zinc

Sulphur

Tin

10. White cast iron contains carbon in the form of

White carbon

Cementite

Free carbon

Graphite

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

Normalizing

Annealing

Carburising

Tempering

12. 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

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

Recrystallization

Allotropic change

Precipitation

Heat treatment

14. Babbitt metal is a

Cadmium base alloy

Lead base alloy

Tin base alloy

Copper base alloy

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

Manganese

Sulphur

Phosphorus

Silicon

16. 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

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

Hardness

Ductility

Brittleness

Plasticity

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

Resilience

Fatigue strength

Creep

Toughness

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

Cast iron

Brass

Wrought iron

Mild steel

20. 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

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

Around 100°C

Below 10°K

Above 100°K

Around 0°C

22. The metallic structure of mild steel is

Body centered cubic

Face centered cubic

Hexagonal close packed

Cubic structure

23. Connecting rod is, usually, made from

High speed steel

Medium carbon steel

High carbon steel

Low carbon steel

24. Nodular iron has

High machinability

High tensile strength

All of the above

Low melting point

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

40 : 60

60 : 40

50 : 50

20 : 80

26. Wrought iron

Is a ductile material

Can be easily forged or welded

Cannot stand sudden and excessive shocks

All of these

27. Stress relaxation is the phenomenon

In which stress remains constant on increasing load

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

In which parts are not loaded

Stress reduces on increasing load

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

Manganese

Phosphorus

Silicon

Sulphur

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

Increase

Decrease

Remain same

First increase and then decrease

30. Silicon when added to copper improves

Hardness and strength

Machinability

Strength and ductility

Hardness

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31. Maximum percentage of carbon in austenite is

0.8%

0.26%

0.025%

1.7%

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

Copper and tin

Copper and iron

Copper and zinc

Copper and nickel

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

RC 65

RC 80

RC 57

RC 48

34. Vanadium in high speed steels

Provides high hot hardness

Promotes decarburisation

Forms very hard carbides and thus increases wear resistance

Promotes retention of austenite

35. Dye penetrant method is generally used to locate

Superficial defects

Surface defects

Core defects

Temporary defects

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

Cycle chains

Cast iron pipes

Gas turbine blades

Flywheel of steam engine

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

Crystalline material

Amorphous material

None of these

Mesomorphous material

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

Naked eye

X-ray techniques

Optical microscope

Metallurgical microscope

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

Sulphur

Phosphorus

Silicon

Manganese

40. Age-hardening is related with

German silver

Duralumin

Gun metal

Stainless steel

Engineering Materials Practice Set-4

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