Engineering Materials Practice Set-4

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1. Babbitt metal is a

Tin base alloy

Cadmium base alloy

Copper base alloy

Lead base alloy

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

Sulphur

Silicon

Manganese

Phosphorus

3. Age-hardening is related with

German silver

Duralumin

Gun metal

Stainless steel

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

Cast iron pipes

Cycle chains

Flywheel of steam engine

Gas turbine blades

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

Fixed structure at all temperatures

Any one of the above

Different crystal structures at different temperatures

Atoms distributed in random pattern

6. Maximum percentage of carbon in austenite is

1.7%

0.025%

0.26%

0.8%

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

Copper and tin

Copper and iron

Copper and zinc

Copper and nickel

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

Sulphur

Tin

Vanadium

Zinc

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

20 : 80

50 : 50

60 : 40

40 : 60

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

Remain same

Increase

First increase and then decrease

Decrease

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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

Mesomorphous material

Crystalline material

12. Silicon when added to copper improves

Hardness

Hardness and strength

Machinability

Strength and ductility

13. 1841 high speed steel contains

Vanadium 18%, chromium 1% and tungsten 4%

Vanadium 4%, chromium 18% and tungsten 1%

Vanadium 1%, chromium 4% and tungsten 18%

None of the above

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

Heat resisting steel

Stainless steel

High speed steel

Invar

15. 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

16. 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

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

Annealing

Carburising

Normalizing

Tempering

18. Vanadium in high speed steels

Provides high hot hardness

Promotes retention of austenite

Forms very hard carbides and thus increases wear resistance

Promotes decarburisation

19. Stress relaxation is the phenomenon

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

Stress reduces on increasing load

20. 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

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21. Nodular iron has

Low melting point

All of the above

High tensile strength

High machinability

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

X-ray techniques

Metallurgical microscope

Naked eye

Optical microscope

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

The chilled cast iron has no graphite

24. Recrystallization temperature can be lowered by

All of the above

Purification of metal

Working at lower temperature

Grain refinement

25. Ferromagnetic alpha iron exists in temperature range of

1400 to 1539°C

Below 723°C

770 to 910°C

910 to 1440°C

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

Creep

Resilience

Fatigue strength

Toughness

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

Allotropic change

Precipitation

Heat treatment

Recrystallization

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

Silicon

Phosphorus

Manganese

Sulphur

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

Mild steel

Wrought iron

Brass

Cast iron

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

Silicon

Phosphorus

Manganese

Sulphur

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31. Wrought iron

Can be easily forged or welded

Is a ductile material

All of these

Cannot stand sudden and excessive shocks

32. White cast iron contains carbon in the form of

Free carbon

Cementite

White carbon

Graphite

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

Above 100°K

Around 0°C

Below 10°K

Around 100°C

34. Delta-iron occurs between the temperature ranges of

600°C to 900°C

1400°C to 1530°C

900°C to 1400°C

400°C to 600°C

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

RC 48

RC 57

RC 65

RC 80

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

Brittleness

Hardness

Ductility

Plasticity

37. The metallic structure of mild steel is

Body centered cubic

Cubic structure

Hexagonal close packed

Face centered cubic

38. Inconel contains

80% nickel and 20% chromium

65% nickel, 15% chromium and 20% iron

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

80% nickel, 14% chromium and 6% iron

39. Dye penetrant method is generally used to locate

Temporary defects

Surface defects

Superficial defects

Core defects

40. Connecting rod is, usually, made from

Medium carbon steel

High carbon steel

Low carbon steel

High speed steel

Engineering Materials Practice Set-4

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