Engineering Materials Practice Set-4

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1. Nodular iron has

Low melting point

All of the above

High machinability

High tensile strength

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

Flywheel of steam engine

Gas turbine blades

Cast iron pipes

Cycle chains

3. Pig iron is the name given to

Iron containing huge quantities of carbon

Product of blast furnace made by reduction of iron ore

Iron in molten form in the ladles

Raw material for blast furnace

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

Phosphorus

Manganese

Silicon

Sulphur

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

Increase

Decrease

Remain same

First increase and then decrease

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

Tempering

Annealing

Carburising

Normalizing

7. Silicon when added to copper improves

Hardness and strength

Machinability

Strength and ductility

Hardness

8. 1841 high speed steel contains

Vanadium 1%, chromium 4% and tungsten 18%

Vanadium 4%, chromium 18% and tungsten 1%

None of the above

Vanadium 18%, chromium 1% and tungsten 4%

9. Wrought iron

Can be easily forged or welded

Cannot stand sudden and excessive shocks

All of these

Is a ductile material

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

RC 48

RC 80

RC 57

RC 65

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

Phosphorus

Sulphur

Manganese

Silicon

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

Recrystallization

Allotropic change

Heat treatment

Precipitation

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

Brittle fracture is always preceded by noise

Cup and cone formation is characteristic for brittle materials

High temperature and low strain rates favour brittle fracture

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

14. Delta-iron occurs between the temperature ranges of

400°C to 600°C

600°C to 900°C

1400°C to 1530°C

900°C to 1400°C

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

Different crystal structures at different temperatures

Fixed structure at all temperatures

Any one of the above

Atoms distributed in random pattern

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

Metallurgical microscope

Naked eye

X-ray techniques

Optical microscope

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

Mesomorphous material

Crystalline material

None of these

Amorphous material

18. Babbitt metal is a

Lead base alloy

Cadmium base alloy

Copper base alloy

Tin base alloy

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

Vanadium

Tin

Zinc

Sulphur

20. White cast iron contains carbon in the form of

White carbon

Graphite

Cementite

Free carbon

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

Resilience

Fatigue strength

Creep

Toughness

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

Mild steel

Brass

Wrought iron

Cast iron

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

Invar

High speed steel

Stainless steel

Heat resisting steel

24. Vanadium in high speed steels

Promotes retention of austenite

Provides high hot hardness

Promotes decarburisation

Forms very hard carbides and thus increases wear resistance

25. Age-hardening is related with

Stainless steel

Gun metal

German silver

Duralumin

26. Stress relaxation is the phenomenon

In which stress remains constant on increasing load

In which parts are not loaded

Stress reduces on increasing load

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

27. Which of the following statement is correct?

The product produced by blast-furnace is called cast iron

The cast iron has high tensile strength

The chilled cast iron has no graphite

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

28. Ferromagnetic alpha iron exists in temperature range of

910 to 1440°C

Below 723°C

770 to 910°C

1400 to 1539°C

29. Maximum percentage of carbon in austenite is

0.26%

0.8%

1.7%

0.025%

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

Copper and nickel

Copper and tin

Copper and iron

Copper and zinc

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31. Inconel contains

80% nickel, 14% chromium and 6% iron

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

80% nickel and 20% chromium

65% nickel, 15% chromium and 20% iron

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

Around 100°C

Around 0°C

Above 100°K

Below 10°K

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

Hardness

Plasticity

Ductility

Brittleness

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

60 : 40

40 : 60

20 : 80

50 : 50

35. Dye penetrant method is generally used to locate

Superficial defects

Temporary defects

Surface defects

Core defects

36. The metallic structure of mild steel is

Face centered cubic

Cubic structure

Body centered cubic

Hexagonal close packed

37. 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

38. Recrystallization temperature can be lowered by

All of the above

Working at lower temperature

Grain refinement

Purification of metal

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

Sulphur

Phosphorus

Manganese

Silicon

40. Connecting rod is, usually, made from

Low carbon steel

Medium carbon steel

High carbon steel

High speed steel

Engineering Materials Practice Set-4

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