Engineering Materials Practice Set-4

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1. Dye penetrant method is generally used to locate

Superficial defects

Surface defects

Core defects

Temporary defects

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

Zinc

Tin

Vanadium

Sulphur

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

Resilience

Fatigue strength

Creep

Toughness

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

Hardness

Plasticity

Ductility

Brittleness

5. Age-hardening is related with

Duralumin

German silver

Stainless steel

Gun metal

6. 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

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

RC 65

RC 57

RC 80

RC 48

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

Mild steel

Cast iron

Wrought iron

Brass

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

Increase

Decrease

First increase and then decrease

Remain same

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

Manganese

Phosphorus

Sulphur

Silicon

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11. Which of the following statement is correct?

The chilled cast iron has no graphite

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

The cast iron has high tensile strength

The product produced by blast-furnace is called cast iron

12. 1841 high speed steel contains

None of the above

Vanadium 4%, chromium 18% and tungsten 1%

Vanadium 1%, chromium 4% and tungsten 18%

Vanadium 18%, chromium 1% and tungsten 4%

13. Babbitt metal is a

Lead base alloy

Copper base alloy

Tin base alloy

Cadmium base alloy

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

Naked eye

X-ray techniques

Optical microscope

Metallurgical microscope

15. Ferromagnetic alpha iron exists in temperature range of

1400 to 1539°C

770 to 910°C

910 to 1440°C

Below 723°C

16. White cast iron contains carbon in the form of

White carbon

Cementite

Graphite

Free carbon

17. Maximum percentage of carbon in austenite is

0.26%

0.025%

0.8%

1.7%

18. Nodular iron has

All of the above

High machinability

Low melting point

High tensile strength

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

Fixed structure at all temperatures

Any one of the above

Atoms distributed in random pattern

Different crystal structures at different temperatures

20. Delta-iron occurs between the temperature ranges of

400°C to 600°C

600°C to 900°C

1400°C to 1530°C

900°C to 1400°C

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

Constant for all metals

The points where no further change occurs

The points of discontinuity

The points where there is no further flow of metal

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

Mesomorphous material

Crystalline material

None of these

Amorphous material

23. 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

24. Recrystallization temperature can be lowered by

Purification of metal

All of the above

Working at lower temperature

Grain refinement

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

High temperature and low strain rates favour brittle fracture

Cup and cone formation is characteristic for brittle materials

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

Brittle fracture is always preceded by noise

26. The metallic structure of mild steel is

Hexagonal close packed

Body centered cubic

Face centered cubic

Cubic structure

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

Tempering

Annealing

Normalizing

Carburising

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

Around 0°C

Above 100°K

Around 100°C

Below 10°K

29. Connecting rod is, usually, made from

High carbon steel

Low carbon steel

Medium carbon steel

High speed steel

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

Copper and nickel

Copper and tin

Copper and zinc

Copper and iron

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

Sulphur

Silicon

Phosphorus

Manganese

32. Inconel contains

80% nickel and 20% chromium

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

80% nickel, 14% chromium and 6% iron

65% nickel, 15% chromium and 20% iron

33. Wrought iron

Is a ductile material

Cannot stand sudden and excessive shocks

Can be easily forged or welded

All of these

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

Invar

Stainless steel

High speed steel

Heat resisting steel

35. Silicon when added to copper improves

Machinability

Hardness and strength

Hardness

Strength and ductility

36. Stress relaxation is the phenomenon

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

In which parts are not loaded

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

40 : 60

20 : 80

50 : 50

60 : 40

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

Cycle chains

Flywheel of steam engine

Gas turbine blades

Cast iron pipes

39. Vanadium in high speed steels

Promotes decarburisation

Provides high hot hardness

Promotes retention of austenite

Forms very hard carbides and thus increases wear resistance

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

Sulphur

Silicon

Manganese

Phosphorus

Engineering Materials Practice Set-4

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