Engineering Materials Practice Set-4

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

The points where no further change occurs

Constant for all metals

The points of discontinuity

The points where there is no further flow of metal

2. Vanadium in high speed steels

Promotes decarburisation

Provides high hot hardness

Forms very hard carbides and thus increases wear resistance

Promotes retention of austenite

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

Copper and nickel

Copper and tin

Copper and iron

Copper and zinc

4. Connecting rod is, usually, made from

High carbon steel

Low carbon steel

Medium carbon steel

High speed steel

5. The metallic structure of mild steel is

Hexagonal close packed

Face centered cubic

Body centered cubic

Cubic structure

6. White cast iron contains carbon in the form of

White carbon

Graphite

Cementite

Free carbon

7. 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

8. Which of the following statement is correct?

The cast iron has high tensile strength

The chilled cast iron has no graphite

The product produced by blast-furnace is called cast iron

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

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

High speed steel

Heat resisting steel

Stainless steel

Invar

10. Wrought iron

Can be easily forged or welded

Is a ductile material

Cannot stand sudden and excessive shocks

All of these

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11. Age-hardening is related with

Gun metal

Stainless steel

German silver

Duralumin

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

Vanadium

Zinc

Sulphur

Tin

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

Recrystallization

Precipitation

Allotropic change

Heat treatment

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

Cycle chains

Flywheel of steam engine

Gas turbine blades

Cast iron pipes

15. Babbitt metal is a

Tin base alloy

Cadmium base alloy

Copper base alloy

Lead base alloy

16. Maximum percentage of carbon in austenite is

0.8%

1.7%

0.025%

0.26%

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

Fatigue strength

Toughness

Creep

Resilience

18. 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

19. Inconel contains

80% nickel and 20% chromium

65% nickel, 15% chromium and 20% iron

80% nickel, 14% chromium and 6% iron

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

20. Dye penetrant method is generally used to locate

Core defects

Superficial defects

Temporary defects

Surface defects

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21. Pig iron is the name given to

Product of blast furnace made by reduction of iron ore

Iron containing huge quantities of carbon

Raw material for blast furnace

Iron in molten form in the ladles

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

X-ray techniques

Naked eye

Optical microscope

Metallurgical microscope

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

Phosphorus

Silicon

Manganese

Sulphur

24. Ferromagnetic alpha iron exists in temperature range of

910 to 1440°C

Below 723°C

1400 to 1539°C

770 to 910°C

25. 1841 high speed steel contains

Vanadium 4%, chromium 18% and tungsten 1%

Vanadium 1%, chromium 4% and tungsten 18%

None of the above

Vanadium 18%, chromium 1% and tungsten 4%

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

Phosphorus

Sulphur

Manganese

Silicon

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

Decrease

Remain same

First increase and then decrease

Increase

28. Silicon when added to copper improves

Machinability

Hardness and strength

Strength and ductility

Hardness

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

None of these

Mesomorphous material

Crystalline material

Amorphous material

30. 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

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

Mild steel

Brass

Cast iron

Wrought iron

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

Brittleness

Plasticity

Ductility

Hardness

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

RC 57

RC 48

RC 65

RC 80

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

20 : 80

60 : 40

40 : 60

50 : 50

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

Manganese

Sulphur

Phosphorus

Silicon

36. 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

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

Around 0°C

Around 100°C

Below 10°K

Above 100°K

38. Recrystallization temperature can be lowered by

Purification of metal

Grain refinement

All of the above

Working at lower temperature

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

Carburising

Normalizing

Annealing

Tempering

40. Nodular iron has

High machinability

High tensile strength

Low melting point

All of the above

Engineering Materials Practice Set-4

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