Engineering Materials Practice Set-4

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1. 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

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

20 : 80

40 : 60

60 : 40

50 : 50

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

Carburising

Annealing

Tempering

Normalizing

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

Heat resisting steel

Invar

Stainless steel

High speed steel

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

Manganese

Phosphorus

Silicon

Sulphur

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

Cast iron pipes

Flywheel of steam engine

Cycle chains

Gas turbine blades

7. The metallic structure of mild steel is

Hexagonal close packed

Face centered cubic

Cubic structure

Body centered cubic

8. Connecting rod is, usually, made from

Low carbon steel

High carbon steel

High speed steel

Medium carbon steel

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

Silicon

Phosphorus

Sulphur

Manganese

10. Maximum percentage of carbon in austenite is

1.7%

0.26%

0.8%

0.025%

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11. Which of the following statement is correct?

The product produced by blast-furnace is called cast iron

The cast iron has high tensile strength

The chilled cast iron has no graphite

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

12. 1841 high speed steel contains

Vanadium 4%, chromium 18% and tungsten 1%

Vanadium 1%, chromium 4% and tungsten 18%

Vanadium 18%, chromium 1% and tungsten 4%

None of the above

13. 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

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

Toughness

Fatigue strength

Creep

Resilience

15. Silicon when added to copper improves

Hardness

Machinability

Hardness and strength

Strength and ductility

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

Optical microscope

Metallurgical microscope

Naked eye

X-ray techniques

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

Above 100°K

Below 10°K

Around 100°C

Around 0°C

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

Decrease

Increase

Remain same

First increase and then decrease

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

Brittle fracture is always preceded by noise

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

Cup and cone formation is characteristic for brittle materials

High temperature and low strain rates favour brittle fracture

20. Inconel contains

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

80% nickel and 20% chromium

65% nickel, 15% chromium and 20% iron

80% nickel, 14% chromium and 6% iron

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21. White cast iron contains carbon in the form of

Graphite

White carbon

Free carbon

Cementite

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

Phosphorus

Silicon

Manganese

Sulphur

23. Nodular iron has

High tensile strength

High machinability

Low melting point

All of the above

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

Mesomorphous material

Crystalline material

None of these

Amorphous material

25. Age-hardening is related with

Stainless steel

Duralumin

German silver

Gun metal

26. Wrought iron

Can be easily forged or welded

All of these

Cannot stand sudden and excessive shocks

Is a ductile material

27. Recrystallization temperature can be lowered by

Purification of metal

Grain refinement

Working at lower temperature

All of the above

28. Babbitt metal is a

Lead base alloy

Tin base alloy

Cadmium base alloy

Copper base alloy

29. Dye penetrant method is generally used to locate

Core defects

Temporary defects

Surface defects

Superficial defects

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

Copper and nickel

Copper and tin

Copper and zinc

Copper and iron

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31. Delta-iron occurs between the temperature ranges of

900°C to 1400°C

600°C to 900°C

400°C to 600°C

1400°C to 1530°C

32. Vanadium in high speed steels

Promotes decarburisation

Forms very hard carbides and thus increases wear resistance

Provides high hot hardness

Promotes retention of austenite

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

Mild steel

Brass

Cast iron

Wrought iron

34. Ferromagnetic alpha iron exists in temperature range of

Below 723°C

1400 to 1539°C

910 to 1440°C

770 to 910°C

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

RC 80

RC 48

RC 57

RC 65

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

Different crystal structures at different temperatures

Atoms distributed in random pattern

Any one of the above

Fixed structure at all temperatures

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

Vanadium

Tin

Zinc

Sulphur

38. Stress relaxation is the phenomenon

In which stress remains constant on increasing load

Stress reduces on increasing load

In which parts are not loaded

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

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

Ductility

Hardness

Brittleness

Plasticity

40. 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

Engineering Materials Practice Set-4

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