Engineering Materials Practice Set-4

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1. Maximum percentage of carbon in austenite is

0.025%

0.26%

1.7%

0.8%

2. Dye penetrant method is generally used to locate

Temporary defects

Core defects

Surface defects

Superficial defects

3. Recrystallization temperature can be lowered by

Grain refinement

Purification of metal

Working at lower temperature

All of the above

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

Different crystal structures at different temperatures

Fixed structure at all temperatures

Atoms distributed in random pattern

Any one of the above

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

Heat treatment

Recrystallization

Allotropic change

Precipitation

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

Heat resisting steel

Stainless steel

High speed steel

Invar

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

40 : 60

20 : 80

50 : 50

60 : 40

8. Delta-iron occurs between the temperature ranges of

900°C to 1400°C

400°C to 600°C

1400°C to 1530°C

600°C to 900°C

9. Which of the following statement is correct?

The chilled cast iron has no graphite

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

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

Mesomorphous material

None of these

Crystalline material

Amorphous material

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11. White cast iron contains carbon in the form of

White carbon

Cementite

Free carbon

Graphite

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

Copper and tin

Copper and iron

Copper and zinc

Copper and nickel

13. 1841 high speed steel contains

None of the above

Vanadium 18%, chromium 1% and tungsten 4%

Vanadium 4%, chromium 18% and tungsten 1%

Vanadium 1%, chromium 4% and tungsten 18%

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

Hardness

Ductility

Brittleness

Plasticity

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

High temperature and low strain rates favour brittle fracture

Brittle fracture is always preceded by noise

Cup and cone formation is characteristic for brittle materials

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

16. Pig iron is the name given to

Iron containing huge quantities of carbon

Product of blast furnace made by reduction of iron ore

Raw material for blast furnace

Iron in molten form in the ladles

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

Sulphur

Phosphorus

Manganese

Silicon

18. Silicon when added to copper improves

Strength and ductility

Hardness

Hardness and strength

Machinability

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

Vanadium

Tin

Sulphur

Zinc

20. Babbitt metal is a

Cadmium base alloy

Tin base alloy

Copper base alloy

Lead base alloy

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

Sulphur

Manganese

Silicon

Phosphorus

22. 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

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

Creep

Fatigue strength

Resilience

Toughness

24. Stress relaxation is the phenomenon

In which parts are not loaded

In which stress remains constant on increasing load

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

Stress reduces on increasing load

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

Remain same

Decrease

Increase

First increase and then decrease

26. Ferromagnetic alpha iron exists in temperature range of

910 to 1440°C

Below 723°C

1400 to 1539°C

770 to 910°C

27. Nodular iron has

All of the above

High tensile strength

High machinability

Low melting point

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

Flywheel of steam engine

Cast iron pipes

Cycle chains

Gas turbine blades

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

Carburising

Tempering

Normalizing

Annealing

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

RC 80

RC 48

RC 65

RC 57

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31. Vanadium in high speed steels

Promotes decarburisation

Provides high hot hardness

Promotes retention of austenite

Forms very hard carbides and thus increases wear resistance

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

Sulphur

Phosphorus

Manganese

Silicon

33. The metallic structure of mild steel is

Hexagonal close packed

Face centered cubic

Cubic structure

Body centered cubic

34. Connecting rod is, usually, made from

Medium carbon steel

High speed steel

High carbon steel

Low carbon steel

35. Age-hardening is related with

Duralumin

Gun metal

German silver

Stainless steel

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

Around 0°C

Above 100°K

Below 10°K

Around 100°C

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

X-ray techniques

Optical microscope

Naked eye

Metallurgical microscope

38. Inconel contains

80% nickel, 14% chromium and 6% iron

80% nickel and 20% chromium

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

65% nickel, 15% chromium and 20% iron

39. Wrought iron

All of these

Cannot stand sudden and excessive shocks

Can be easily forged or welded

Is a ductile material

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

Mild steel

Wrought iron

Cast iron

Brass

Engineering Materials Practice Set-4

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