Engineering Materials Practice Set-4

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1. Silicon when added to copper improves

Hardness

Strength and ductility

Machinability

Hardness and strength

2. Nodular iron has

Low melting point

High machinability

High tensile strength

All of the above

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

Copper and nickel

Copper and iron

Copper and tin

Copper and zinc

4. Age-hardening is related with

Stainless steel

Duralumin

Gun metal

German silver

5. The metallic structure of mild steel is

Body centered cubic

Hexagonal close packed

Face centered cubic

Cubic structure

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

Manganese

Sulphur

Phosphorus

Silicon

7. Dye penetrant method is generally used to locate

Temporary defects

Superficial defects

Surface defects

Core defects

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

Manganese

Sulphur

Silicon

Phosphorus

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

Sulphur

Manganese

Silicon

Phosphorus

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

Cast iron pipes

Gas turbine blades

Flywheel of steam engine

Cycle chains

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

Hardness

Ductility

Brittleness

Plasticity

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

Cast iron

Mild steel

Wrought iron

Brass

13. Pig iron is the name given to

Iron in molten form in the ladles

Product of blast furnace made by reduction of iron ore

Iron containing huge quantities of carbon

Raw material for blast furnace

14. White cast iron contains carbon in the form of

White carbon

Free carbon

Cementite

Graphite

15. 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

16. Ferromagnetic alpha iron exists in temperature range of

910 to 1440°C

1400 to 1539°C

770 to 910°C

Below 723°C

17. 1841 high speed steel contains

Vanadium 1%, chromium 4% and tungsten 18%

None of the above

Vanadium 18%, chromium 1% and tungsten 4%

Vanadium 4%, chromium 18% and tungsten 1%

18. 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

Cup and cone formation is characteristic for brittle materials

High temperature and low strain rates favour brittle fracture

Brittle fracture is always preceded by noise

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

Metallurgical microscope

X-ray techniques

Naked eye

Optical microscope

20. Wrought iron

Cannot stand sudden and excessive shocks

All of these

Can be easily forged or welded

Is a ductile material

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

Crystalline material

None of these

Amorphous material

Mesomorphous material

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

Different crystal structures at different temperatures

Atoms distributed in random pattern

Any one of the above

Fixed structure at all temperatures

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

Sulphur

Tin

Vanadium

Zinc

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

Remain same

First increase and then decrease

Increase

Decrease

25. Recrystallization temperature can be lowered by

Grain refinement

Purification of metal

Working at lower temperature

All of the above

26. Inconel contains

80% nickel and 20% chromium

80% nickel, 14% chromium and 6% iron

65% nickel, 15% chromium and 20% iron

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

27. 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

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

Normalizing

Carburising

Tempering

Annealing

29. Delta-iron occurs between the temperature ranges of

600°C to 900°C

400°C to 600°C

900°C to 1400°C

1400°C to 1530°C

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

Around 100°C

Above 100°K

Below 10°K

Around 0°C

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31. Which of the following statement is correct?

The chilled cast iron has no graphite

The cast iron has high tensile strength

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

The product produced by blast-furnace is called cast iron

32. Maximum percentage of carbon in austenite is

0.8%

1.7%

0.025%

0.26%

33. Babbitt metal is a

Copper base alloy

Cadmium base alloy

Lead base alloy

Tin base alloy

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

The points where no further change occurs

The points of discontinuity

Constant for all metals

The points where there is no further flow of metal

35. Vanadium in high speed steels

Promotes decarburisation

Forms very hard carbides and thus increases wear resistance

Promotes retention of austenite

Provides high hot hardness

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

RC 80

RC 57

RC 48

RC 65

37. Connecting rod is, usually, made from

High speed steel

Low carbon steel

Medium carbon steel

High carbon steel

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

Stainless steel

High speed steel

Heat resisting steel

Invar

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

Creep

Fatigue strength

Toughness

Resilience

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

50 : 50

20 : 80

60 : 40

40 : 60

Engineering Materials Practice Set-4

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