Engineering Materials Practice Set-4

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1. Age-hardening is related with

Gun metal

German silver

Duralumin

Stainless steel

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

20 : 80

60 : 40

40 : 60

50 : 50

3. Recrystallization temperature can be lowered by

Working at lower temperature

Purification of metal

All of the above

Grain refinement

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

X-ray techniques

Optical microscope

Metallurgical microscope

Naked eye

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

Toughness

Fatigue strength

Creep

Resilience

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

Above 100°K

Below 10°K

Around 100°C

Around 0°C

7. Delta-iron occurs between the temperature ranges of

400°C to 600°C

1400°C to 1530°C

900°C to 1400°C

600°C to 900°C

8. Nodular iron has

High machinability

Low melting point

All of the above

High tensile strength

9. Pig iron is the name given to

Iron containing huge quantities of carbon

Raw material for blast furnace

Iron in molten form in the ladles

Product of blast furnace made by reduction of iron ore

10. 1841 high speed steel contains

Vanadium 1%, chromium 4% and tungsten 18%

Vanadium 18%, chromium 1% and tungsten 4%

Vanadium 4%, chromium 18% and tungsten 1%

None of the above

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11. Inconel contains

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

65% nickel, 15% chromium and 20% iron

80% nickel and 20% chromium

80% nickel, 14% chromium and 6% iron

12. Babbitt metal is a

Copper base alloy

Lead base alloy

Tin base alloy

Cadmium base alloy

13. Ferromagnetic alpha iron exists in temperature range of

1400 to 1539°C

910 to 1440°C

Below 723°C

770 to 910°C

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

Sulphur

Silicon

Manganese

Phosphorus

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

Plasticity

Brittleness

Hardness

Ductility

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

Copper and iron

Copper and tin

Copper and nickel

Copper and zinc

17. Which of the following statement is correct?

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

The chilled cast iron has no graphite

The cast iron has high tensile strength

The product produced by blast-furnace is called cast iron

18. Wrought iron

Cannot stand sudden and excessive shocks

Can be easily forged or welded

Is a ductile material

All of these

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

Silicon

Sulphur

Manganese

Phosphorus

20. Connecting rod is, usually, made from

Medium carbon steel

High speed steel

High carbon steel

Low carbon steel

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21. Maximum percentage of carbon in austenite is

0.025%

1.7%

0.8%

0.26%

22. The metallic structure of mild steel is

Cubic structure

Body centered cubic

Face centered cubic

Hexagonal close packed

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

Brittle fracture is always preceded by noise

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

24. Dye penetrant method is generally used to locate

Surface defects

Core defects

Temporary defects

Superficial defects

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

High speed steel

Stainless steel

Heat resisting steel

Invar

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

Sulphur

Silicon

Manganese

Phosphorus

27. Silicon when added to copper improves

Machinability

Hardness

Strength and ductility

Hardness and strength

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

Vanadium

Sulphur

Tin

Zinc

29. Stress relaxation is the phenomenon

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

In which parts are not loaded

Stress reduces on increasing load

In which stress remains constant on increasing load

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

RC 57

RC 65

RC 48

RC 80

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31. Vanadium in high speed steels

Forms very hard carbides and thus increases wear resistance

Promotes retention of austenite

Promotes decarburisation

Provides high hot hardness

32. 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

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

Recrystallization

Allotropic change

Precipitation

Heat treatment

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

Cast iron

Brass

Wrought iron

Mild steel

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

Normalizing

Tempering

Carburising

Annealing

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

Gas turbine blades

Cycle chains

Cast iron pipes

Flywheel of steam engine

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

Constant for all metals

The points of discontinuity

The points where there is no further flow of metal

The points where no further change occurs

38. White cast iron contains carbon in the form of

Cementite

White carbon

Graphite

Free carbon

39. 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

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

None of these

Crystalline material

Amorphous material

Mesomorphous material

Engineering Materials Practice Set-4

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