Engineering Materials Practice Set-4

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

Ductility

Brittleness

Plasticity

Hardness

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

Copper and nickel

Copper and iron

Copper and zinc

Copper and tin

3. 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

4. Pig iron is the name given to

Iron in molten form in the ladles

Iron containing huge quantities of carbon

Raw material for blast furnace

Product of blast furnace made by reduction of iron ore

5. Nodular iron has

Low melting point

High tensile strength

High machinability

All of the above

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

Wrought iron

Mild steel

Brass

Cast iron

7. The metallic structure of mild steel is

Cubic structure

Face centered cubic

Hexagonal close packed

Body centered cubic

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

Stainless steel

Heat resisting steel

Invar

High speed steel

9. Babbitt metal is a

Cadmium base alloy

Tin base alloy

Lead base alloy

Copper base alloy

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

RC 48

RC 80

RC 65

RC 57

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

50 : 50

20 : 80

40 : 60

60 : 40

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

Fixed structure at all temperatures

Atoms distributed in random pattern

Different crystal structures at different temperatures

Any one of the above

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

Resilience

Creep

Fatigue strength

Toughness

14. Maximum percentage of carbon in austenite is

0.025%

1.7%

0.26%

0.8%

15. Recrystallization temperature can be lowered by

All of the above

Working at lower temperature

Purification of metal

Grain refinement

16. White cast iron contains carbon in the form of

Graphite

Cementite

Free carbon

White carbon

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

Optical microscope

Naked eye

X-ray techniques

Metallurgical microscope

18. Connecting rod is, usually, made from

Low carbon steel

High speed steel

High carbon steel

Medium carbon steel

19. Inconel contains

65% nickel, 15% chromium and 20% iron

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

80% nickel and 20% chromium

80% nickel, 14% chromium and 6% iron

20. Silicon when added to copper improves

Hardness

Machinability

Strength and ductility

Hardness and strength

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21. Dye penetrant method is generally used to locate

Temporary defects

Surface defects

Superficial defects

Core defects

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

Cup and cone formation is characteristic for brittle materials

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

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

Silicon

Sulphur

Phosphorus

Manganese

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

Phosphorus

Manganese

Silicon

Sulphur

25. Ferromagnetic alpha iron exists in temperature range of

770 to 910°C

Below 723°C

1400 to 1539°C

910 to 1440°C

26. Stress relaxation is the phenomenon

Stress reduces on increasing load

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

In which parts are not loaded

In which stress remains constant on increasing load

27. Age-hardening is related with

Gun metal

Stainless steel

German silver

Duralumin

28. Vanadium in high speed steels

Promotes decarburisation

Forms very hard carbides and thus increases wear resistance

Provides high hot hardness

Promotes retention of austenite

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

Mesomorphous material

Crystalline material

Amorphous material

None of these

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

Recrystallization

Heat treatment

Precipitation

Allotropic change

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

Cycle chains

Gas turbine blades

Flywheel of steam engine

Cast iron pipes

32. Wrought iron

All of these

Is a ductile material

Can be easily forged or welded

Cannot stand sudden and excessive shocks

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

Constant for all metals

The points where there is no further flow of metal

The points of discontinuity

The points where no further change occurs

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

Around 100°C

Below 10°K

Above 100°K

Around 0°C

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

Phosphorus

Silicon

Sulphur

Manganese

36. 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

37. 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%

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

Zinc

Sulphur

Vanadium

Tin

39. Delta-iron occurs between the temperature ranges of

600°C to 900°C

400°C to 600°C

900°C to 1400°C

1400°C to 1530°C

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

Normalizing

Carburising

Tempering

Annealing

Engineering Materials Practice Set-4

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