Engineering Materials Practice Set-4

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

Sulphur

Manganese

Silicon

Phosphorus

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

20 : 80

50 : 50

60 : 40

40 : 60

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

Toughness

Creep

Resilience

Fatigue strength

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

Brittleness

Plasticity

Ductility

Hardness

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

First increase and then decrease

Remain same

Decrease

Increase

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

Mesomorphous material

None of these

Amorphous material

Crystalline material

7. Ferromagnetic alpha iron exists in temperature range of

Below 723°C

770 to 910°C

1400 to 1539°C

910 to 1440°C

8. Silicon when added to copper improves

Machinability

Hardness

Hardness and strength

Strength and ductility

9. Age-hardening is related with

Gun metal

Stainless steel

Duralumin

German silver

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

Heat resisting steel

Stainless steel

High speed steel

Invar

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11. The metallic structure of mild steel is

Cubic structure

Hexagonal close packed

Face centered cubic

Body centered cubic

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

Wrought iron

Brass

Cast iron

Mild steel

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

Copper and tin

Copper and iron

Copper and nickel

Copper and zinc

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

Phosphorus

Silicon

Sulphur

Manganese

15. Maximum percentage of carbon in austenite is

0.025%

0.26%

0.8%

1.7%

16. Dye penetrant method is generally used to locate

Core defects

Surface defects

Temporary defects

Superficial defects

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

Naked eye

Metallurgical microscope

Optical microscope

X-ray techniques

18. Inconel contains

80% nickel, 14% chromium and 6% iron

65% nickel, 15% chromium and 20% iron

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

80% nickel and 20% chromium

19. Wrought iron

Can be easily forged or welded

All of these

Is a ductile material

Cannot stand sudden and excessive shocks

20. 1841 high speed steel contains

Vanadium 4%, chromium 18% and tungsten 1%

Vanadium 18%, chromium 1% and tungsten 4%

Vanadium 1%, chromium 4% and tungsten 18%

None of the above

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21. 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

Constant for all metals

The points of discontinuity

22. Nodular iron has

Low melting point

All of the above

High tensile strength

High machinability

23. Delta-iron occurs between the temperature ranges of

400°C to 600°C

900°C to 1400°C

600°C to 900°C

1400°C to 1530°C

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

Manganese

Silicon

Sulphur

Phosphorus

25. Stress relaxation is the phenomenon

Stress reduces on increasing load

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

In which stress remains constant on increasing load

In which parts are not loaded

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

Precipitation

Recrystallization

Heat treatment

Allotropic change

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

Vanadium

Zinc

Sulphur

Tin

28. Connecting rod is, usually, made from

High carbon steel

High speed steel

Medium carbon steel

Low carbon steel

29. Pig iron is the name given to

Product of blast furnace made by reduction of iron ore

Raw material for blast furnace

Iron containing huge quantities of carbon

Iron in molten form in the ladles

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

Above 100°K

Below 10°K

Around 100°C

Around 0°C

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31. White cast iron contains carbon in the form of

Free carbon

Cementite

White carbon

Graphite

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

Normalizing

Annealing

Tempering

Carburising

33. Babbitt metal is a

Lead base alloy

Tin base alloy

Copper base alloy

Cadmium base alloy

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

Gas turbine blades

Cycle chains

Flywheel of steam engine

Cast iron pipes

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

Atoms distributed in random pattern

Fixed structure at all temperatures

Different crystal structures at different temperatures

Any one of the above

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

RC 48

RC 65

RC 80

RC 57

37. 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

38. Vanadium in high speed steels

Promotes decarburisation

Forms very hard carbides and thus increases wear resistance

Provides high hot hardness

Promotes retention of austenite

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

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

Brittle fracture is always preceded by noise

40. Recrystallization temperature can be lowered by

Purification of metal

Grain refinement

All of the above

Working at lower temperature

Engineering Materials Practice Set-4

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