Engineering Materials Practice Set-4

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

Optical microscope

Naked eye

X-ray techniques

Metallurgical microscope

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

Copper and nickel

Copper and iron

Copper and zinc

Copper and tin

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

The points where there is no further flow of metal

The points of discontinuity

The points where no further change occurs

Constant for all metals

4. Babbitt metal is a

Lead base alloy

Cadmium base alloy

Copper base alloy

Tin base alloy

5. Delta-iron occurs between the temperature ranges of

1400°C to 1530°C

400°C to 600°C

600°C to 900°C

900°C to 1400°C

6. Recrystallization temperature can be lowered by

Working at lower temperature

Purification of metal

Grain refinement

All of the above

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

Manganese

Sulphur

Phosphorus

Silicon

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

Wrought iron

Mild steel

Brass

Cast iron

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

Atoms distributed in random pattern

Any one of the above

Fixed structure at all temperatures

Different crystal structures at different temperatures

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

Heat treatment

Allotropic change

Recrystallization

Precipitation

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

Hardness

Brittleness

Plasticity

Ductility

12. Inconel contains

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

80% nickel and 20% chromium

65% nickel, 15% chromium and 20% iron

80% nickel, 14% chromium and 6% iron

13. Stress relaxation is the phenomenon

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

In which parts are not loaded

14. Pig iron is the name given to

Raw material for blast furnace

Iron in molten form in the ladles

Product of blast furnace made by reduction of iron ore

Iron containing huge quantities of carbon

15. 1841 high speed steel contains

Vanadium 4%, chromium 18% and tungsten 1%

None of the above

Vanadium 1%, chromium 4% and tungsten 18%

Vanadium 18%, chromium 1% and tungsten 4%

16. White cast iron contains carbon in the form of

Free carbon

Graphite

White carbon

Cementite

17. Which of the following statement is correct?

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

The product produced by blast-furnace is called cast iron

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

Fatigue strength

Resilience

Creep

Toughness

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

Normalizing

Annealing

Tempering

Carburising

20. The metallic structure of mild steel is

Hexagonal close packed

Face centered cubic

Cubic structure

Body centered cubic

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21. Age-hardening is related with

Stainless steel

German silver

Duralumin

Gun metal

22. Ferromagnetic alpha iron exists in temperature range of

770 to 910°C

Below 723°C

1400 to 1539°C

910 to 1440°C

23. Wrought iron

All of these

Can be easily forged or welded

Is a ductile material

Cannot stand sudden and excessive shocks

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

Manganese

Silicon

Phosphorus

Sulphur

25. Connecting rod is, usually, made from

High carbon steel

High speed steel

Medium carbon steel

Low carbon steel

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

RC 65

RC 48

RC 80

RC 57

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

60 : 40

50 : 50

20 : 80

40 : 60

28. 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

Increase

Decrease

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

Phosphorus

Sulphur

Manganese

Silicon

30. 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

Brittle fracture is always preceded by noise

Cup and cone formation is characteristic for brittle materials

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

Flywheel of steam engine

Cast iron pipes

Gas turbine blades

Cycle chains

32. Dye penetrant method is generally used to locate

Surface defects

Superficial defects

Temporary defects

Core defects

33. Maximum percentage of carbon in austenite is

0.26%

1.7%

0.025%

0.8%

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

Vanadium

Sulphur

Tin

Zinc

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

Crystalline material

Mesomorphous material

None of these

Amorphous material

36. Nodular iron has

High machinability

All of the above

Low melting point

High tensile strength

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

Above 100°K

Around 0°C

Below 10°K

Around 100°C

38. Vanadium in high speed steels

Promotes retention of austenite

Promotes decarburisation

Forms very hard carbides and thus increases wear resistance

Provides high hot hardness

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

High speed steel

Heat resisting steel

Invar

Stainless steel

40. Silicon when added to copper improves

Strength and ductility

Hardness

Hardness and strength

Machinability

Engineering Materials Practice Set-4

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