Engineering Materials Practice Set-4

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

Copper and zinc

Copper and nickel

Copper and iron

Copper and tin

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

Allotropic change

Heat treatment

Recrystallization

Precipitation

3. The metallic structure of mild steel is

Cubic structure

Body centered cubic

Face centered cubic

Hexagonal close packed

4. Connecting rod is, usually, made from

Low carbon steel

High carbon steel

Medium carbon steel

High speed steel

5. Maximum percentage of carbon in austenite is

0.8%

0.26%

1.7%

0.025%

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

Phosphorus

Sulphur

Manganese

Silicon

7. Inconel contains

80% nickel, 14% chromium and 6% iron

80% nickel and 20% chromium

65% nickel, 15% chromium and 20% iron

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

8. Age-hardening is related with

Gun metal

Duralumin

German silver

Stainless steel

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

Silicon

Sulphur

Manganese

Phosphorus

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

Gas turbine blades

Cycle chains

Cast iron pipes

Flywheel of steam engine

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11. Babbitt metal is a

Copper base alloy

Cadmium base alloy

Tin base alloy

Lead base alloy

12. Ferromagnetic alpha iron exists in temperature range of

1400 to 1539°C

Below 723°C

910 to 1440°C

770 to 910°C

13. Nodular iron has

High machinability

High tensile strength

Low melting point

All of the above

14. Recrystallization temperature can be lowered by

Working at lower temperature

All of the above

Purification of metal

Grain refinement

15. Delta-iron occurs between the temperature ranges of

900°C to 1400°C

1400°C to 1530°C

400°C to 600°C

600°C to 900°C

16. 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

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

Atoms distributed in random pattern

Any one of the above

Different crystal structures at different temperatures

Fixed structure at all temperatures

18. 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

19. Pig iron is the name given to

Product of blast furnace made by reduction of iron ore

Raw material for blast furnace

Iron in molten form in the ladles

Iron containing huge quantities of carbon

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

Normalizing

Annealing

Tempering

Carburising

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

Manganese

Silicon

Phosphorus

Sulphur

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

RC 80

RC 57

RC 65

RC 48

23. 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

Increase

Decrease

Remain same

24. Dye penetrant method is generally used to locate

Core defects

Superficial defects

Temporary defects

Surface defects

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

Mild steel

Wrought iron

Brass

Cast iron

26. 1841 high speed steel contains

Vanadium 18%, chromium 1% and tungsten 4%

None of the above

Vanadium 4%, chromium 18% and tungsten 1%

Vanadium 1%, chromium 4% and tungsten 18%

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

High speed steel

Invar

Stainless steel

Heat resisting steel

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

High temperature and low strain rates favour 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

Brittle fracture is always preceded by noise

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

None of these

Crystalline material

Mesomorphous material

Amorphous material

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

Naked eye

Optical microscope

Metallurgical microscope

X-ray techniques

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31. White cast iron contains carbon in the form of

White carbon

Graphite

Cementite

Free carbon

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

Around 0°C

Below 10°K

Around 100°C

Above 100°K

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

Toughness

Fatigue strength

Creep

Resilience

34. Silicon when added to copper improves

Strength and ductility

Hardness

Machinability

Hardness and strength

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

40 : 60

20 : 80

50 : 50

60 : 40

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

Vanadium

Tin

Sulphur

Zinc

37. Vanadium in high speed steels

Promotes decarburisation

Promotes retention of austenite

Forms very hard carbides and thus increases wear resistance

Provides high hot hardness

38. Which of the following statement is correct?

The chilled cast iron has no graphite

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

The cast iron has high tensile strength

The product produced by blast-furnace is called cast iron

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

Ductility

Plasticity

Hardness

Brittleness

40. Wrought iron

All of these

Cannot stand sudden and excessive shocks

Can be easily forged or welded

Is a ductile material

Engineering Materials Practice Set-4

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