Engineering Materials Practice Set-4

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

Phosphorus

Sulphur

Manganese

Silicon

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

20 : 80

40 : 60

50 : 50

60 : 40

3. White cast iron contains carbon in the form of

White carbon

Graphite

Cementite

Free carbon

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

Optical microscope

Naked eye

X-ray techniques

Metallurgical microscope

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

Around 0°C

Below 10°K

Above 100°K

Around 100°C

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

Crystalline material

Mesomorphous material

Amorphous material

None of these

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

The points where there is no further flow of metal

Constant for all metals

The points of discontinuity

The points where no further change occurs

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

Resilience

Creep

Fatigue strength

Toughness

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

Heat resisting steel

High speed steel

Stainless steel

Invar

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

Cast iron

Wrought iron

Mild steel

Brass

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11. 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 chilled cast iron has no graphite

The cast iron has high tensile strength

12. Inconel contains

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

65% nickel, 15% chromium and 20% iron

80% nickel, 14% chromium and 6% iron

80% nickel and 20% chromium

13. Stress relaxation is the phenomenon

In which parts are not loaded

Stress reduces on increasing load

In which stress remains constant on increasing load

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

14. The metallic structure of mild steel is

Cubic structure

Hexagonal close packed

Face centered cubic

Body centered cubic

15. 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

High temperature and low strain rates favour brittle fracture

Cup and cone formation is characteristic for brittle materials

16. 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

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

Sulphur

Tin

Vanadium

Zinc

18. Nodular iron has

Low melting point

High machinability

High tensile strength

All of the above

19. Recrystallization temperature can be lowered by

Purification of metal

All of the above

Grain refinement

Working at lower temperature

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

RC 48

RC 57

RC 80

RC 65

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

Normalizing

Tempering

Carburising

Annealing

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

Remain same

First increase and then decrease

Decrease

Increase

23. Ferromagnetic alpha iron exists in temperature range of

770 to 910°C

1400 to 1539°C

910 to 1440°C

Below 723°C

24. Dye penetrant method is generally used to locate

Core defects

Surface defects

Temporary defects

Superficial defects

25. Connecting rod is, usually, made from

High speed steel

High carbon steel

Medium carbon steel

Low carbon steel

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

Copper and zinc

Copper and tin

Copper and nickel

Copper and iron

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

Allotropic change

Heat treatment

Precipitation

Recrystallization

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

Gas turbine blades

Cycle chains

Cast iron pipes

Flywheel of steam engine

29. Age-hardening is related with

Gun metal

Duralumin

Stainless steel

German silver

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

Manganese

Sulphur

Silicon

Phosphorus

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

Hardness

Plasticity

Brittleness

Ductility

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

Fixed structure at all temperatures

Atoms distributed in random pattern

Any one of the above

Different crystal structures at different temperatures

33. Pig iron is the name given to

Product of blast furnace made by reduction of iron ore

Raw material for blast furnace

Iron containing huge quantities of carbon

Iron in molten form in the ladles

34. 1841 high speed steel contains

None of the above

Vanadium 18%, chromium 1% and tungsten 4%

Vanadium 4%, chromium 18% and tungsten 1%

Vanadium 1%, chromium 4% and tungsten 18%

35. Wrought iron

Cannot stand sudden and excessive shocks

Can be easily forged or welded

Is a ductile material

All of these

36. Silicon when added to copper improves

Machinability

Hardness

Strength and ductility

Hardness and strength

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

Phosphorus

Manganese

Silicon

Sulphur

38. Babbitt metal is a

Cadmium base alloy

Lead base alloy

Copper base alloy

Tin base alloy

39. Maximum percentage of carbon in austenite is

0.8%

0.26%

0.025%

1.7%

40. Vanadium in high speed steels

Provides high hot hardness

Promotes retention of austenite

Promotes decarburisation

Forms very hard carbides and thus increases wear resistance

Engineering Materials Practice Set-4

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