Engineering Materials Practice Set-4

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1. Pig iron is the name given to

Product of blast furnace made by reduction of iron ore

Raw material for blast furnace

Iron in molten form in the ladles

Iron containing huge quantities of carbon

2. Stress relaxation is the phenomenon

Stress reduces on increasing load

In which parts are not loaded

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

In which stress remains constant on increasing load

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

Copper and nickel

Copper and zinc

Copper and iron

Copper and tin

4. 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 pig iron is the name given to the product produced by cupola

The chilled cast iron has no graphite

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

Decrease

First increase and then decrease

Increase

Remain same

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

Around 0°C

Around 100°C

Above 100°K

Below 10°K

7. Connecting rod is, usually, made from

Medium carbon steel

High carbon steel

High speed steel

Low carbon steel

8. Delta-iron occurs between the temperature ranges of

1400°C to 1530°C

600°C to 900°C

900°C to 1400°C

400°C to 600°C

9. Recrystallization temperature can be lowered by

Grain refinement

All of the above

Working at lower temperature

Purification of metal

10. Vanadium in high speed steels

Promotes decarburisation

Forms very hard carbides and thus increases wear resistance

Provides high hot hardness

Promotes retention of austenite

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

Amorphous material

None of these

Crystalline material

Mesomorphous material

12. Ferromagnetic alpha iron exists in temperature range of

910 to 1440°C

Below 723°C

1400 to 1539°C

770 to 910°C

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

RC 48

RC 57

RC 80

RC 65

14. 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

15. The metallic structure of mild steel is

Hexagonal close packed

Cubic structure

Face centered cubic

Body centered cubic

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

Stainless steel

High speed steel

Invar

Heat resisting steel

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

Gas turbine blades

Flywheel of steam engine

Cast iron pipes

Cycle chains

18. White cast iron contains carbon in the form of

White carbon

Graphite

Cementite

Free carbon

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

40 : 60

20 : 80

60 : 40

50 : 50

20. Wrought iron

Cannot stand sudden and excessive shocks

All of these

Can be easily forged or welded

Is a ductile material

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

Silicon

Manganese

Phosphorus

Sulphur

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

Annealing

Normalizing

Tempering

Carburising

23. 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

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

Manganese

Phosphorus

Sulphur

Silicon

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

Wrought iron

Brass

Mild steel

Cast iron

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

Vanadium

Sulphur

Tin

Zinc

27. Silicon when added to copper improves

Machinability

Hardness

Strength and ductility

Hardness and strength

28. 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%

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

Fatigue strength

Resilience

Toughness

Creep

30. Maximum percentage of carbon in austenite is

0.8%

0.26%

0.025%

1.7%

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

Ductility

Hardness

Brittleness

Plasticity

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

Metallurgical microscope

X-ray techniques

Naked eye

Optical microscope

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

Sulphur

Phosphorus

Manganese

Silicon

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

Recrystallization

Precipitation

Heat treatment

Allotropic change

35. Babbitt metal is a

Tin base alloy

Lead base alloy

Cadmium base alloy

Copper base alloy

36. Nodular iron has

Low melting point

All of the above

High tensile strength

High machinability

37. Inconel contains

65% nickel, 15% chromium and 20% iron

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

80% nickel, 14% chromium and 6% iron

80% nickel and 20% chromium

38. Age-hardening is related with

Stainless steel

German silver

Duralumin

Gun metal

39. Dye penetrant method is generally used to locate

Core defects

Superficial defects

Surface defects

Temporary defects

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

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

Engineering Materials Practice Set-4

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