Engineering Materials Practice Set-4

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

RC 48

RC 57

RC 65

RC 80

2. Recrystallization temperature can be lowered by

Grain refinement

Purification of metal

All of the above

Working at lower temperature

3. Babbitt metal is a

Lead base alloy

Cadmium base alloy

Tin base alloy

Copper base alloy

4. 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

5. Stress relaxation is the phenomenon

In which parts are not loaded

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

6. Wrought iron

Can be easily forged or welded

Cannot stand sudden and excessive shocks

All of these

Is a ductile material

7. Age-hardening is related with

Stainless steel

Duralumin

Gun metal

German silver

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

Manganese

Silicon

Phosphorus

Sulphur

9. Pig iron is the name given to

Iron in molten form in the ladles

Iron containing huge quantities of carbon

Product of blast furnace made by reduction of iron ore

Raw material for blast furnace

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

Manganese

Sulphur

Silicon

Phosphorus

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11. Delta-iron occurs between the temperature ranges of

600°C to 900°C

900°C to 1400°C

1400°C to 1530°C

400°C to 600°C

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

50 : 50

60 : 40

40 : 60

20 : 80

13. 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

14. White cast iron contains carbon in the form of

Cementite

Free carbon

White carbon

Graphite

15. 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

16. 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%

17. Vanadium in high speed steels

Promotes decarburisation

Promotes retention of austenite

Forms very hard carbides and thus increases wear resistance

Provides high hot hardness

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

Increase

Remain same

Decrease

First increase and then decrease

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

High temperature and low strain rates favour 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

20. Nodular iron has

High tensile strength

High machinability

Low melting point

All of the above

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

Stainless steel

High speed steel

Invar

Heat resisting steel

22. Dye penetrant method is generally used to locate

Surface defects

Superficial defects

Temporary defects

Core defects

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

Copper and iron

Copper and nickel

Copper and zinc

Copper and tin

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

Wrought iron

Mild steel

Brass

Cast iron

25. Inconel contains

80% nickel, 14% chromium and 6% iron

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

65% nickel, 15% chromium and 20% iron

80% nickel and 20% chromium

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

Allotropic change

Recrystallization

Heat treatment

Precipitation

27. The metallic structure of mild steel is

Hexagonal close packed

Cubic structure

Body centered cubic

Face centered cubic

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

Plasticity

Brittleness

Ductility

Hardness

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

Annealing

Normalizing

Carburising

Tempering

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

Creep

Fatigue strength

Toughness

Resilience

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

The points where no further change occurs

Constant for all metals

The points where there is no further flow of metal

The points of discontinuity

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

Around 0°C

Around 100°C

Above 100°K

Below 10°K

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

Manganese

Sulphur

Phosphorus

Silicon

34. Connecting rod is, usually, made from

Low carbon steel

Medium carbon steel

High speed steel

High carbon steel

35. Maximum percentage of carbon in austenite is

0.025%

1.7%

0.26%

0.8%

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

Vanadium

Sulphur

Zinc

Tin

37. Silicon when added to copper improves

Hardness

Strength and ductility

Hardness and strength

Machinability

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

Flywheel of steam engine

Gas turbine blades

Cast iron pipes

Cycle chains

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

Optical microscope

Metallurgical microscope

Naked eye

X-ray techniques

40. Ferromagnetic alpha iron exists in temperature range of

Below 723°C

910 to 1440°C

1400 to 1539°C

770 to 910°C

Engineering Materials Practice Set-4

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