Engineering Materials Practice Set-4

Page 1 of 4

1. Stress relaxation is the phenomenon

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

Stress reduces on increasing load

In which parts are not loaded

In which stress remains constant on increasing load

2. Silicon when added to copper improves

Hardness and strength

Strength and ductility

Machinability

Hardness

3. Recrystallization temperature can be lowered by

Grain refinement

Working at lower temperature

All of the above

Purification of metal

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

Tin

Sulphur

Zinc

Vanadium

5. Babbitt metal is a

Cadmium base alloy

Tin base alloy

Lead base alloy

Copper base alloy

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

Ductility

Brittleness

Plasticity

Hardness

7. Which of the following statement is true about 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

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

8. Dye penetrant method is generally used to locate

Superficial defects

Surface defects

Temporary defects

Core defects

9. Age-hardening is related with

Stainless steel

Gun metal

German silver

Duralumin

10. Wrought iron

Is a ductile material

Can be easily forged or welded

All of these

Cannot stand sudden and excessive shocks

Page 2 of 4

11. Which of the following statement is correct?

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

The cast iron has high tensile strength

The chilled cast iron has no graphite

The product produced by blast-furnace is called cast iron

12. Delta-iron occurs between the temperature ranges of

600°C to 900°C

1400°C to 1530°C

900°C to 1400°C

400°C to 600°C

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

RC 48

RC 80

RC 65

RC 57

14. 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

15. Maximum percentage of carbon in austenite is

1.7%

0.26%

0.8%

0.025%

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

Silicon

Phosphorus

Sulphur

Manganese

17. 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

18. The metallic structure of mild steel is

Hexagonal close packed

Body centered cubic

Cubic structure

Face centered cubic

19. Ferromagnetic alpha iron exists in temperature range of

Below 723°C

1400 to 1539°C

770 to 910°C

910 to 1440°C

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

40 : 60

50 : 50

20 : 80

60 : 40

Page 3 of 4

21. Nodular iron has

High machinability

High tensile strength

Low melting point

All of the above

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

Any one of the above

Different crystal structures at different temperatures

Atoms distributed in random pattern

Fixed structure at all temperatures

23. White cast iron contains carbon in the form of

Free carbon

White carbon

Graphite

Cementite

24. Connecting rod is, usually, made from

High speed steel

Low carbon steel

High carbon steel

Medium carbon steel

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

Copper and iron

Copper and zinc

Copper and tin

Copper and nickel

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

Mild steel

Brass

Wrought iron

Cast iron

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

Annealing

Tempering

Carburising

Normalizing

28. Vanadium in high speed steels

Promotes retention of austenite

Provides high hot hardness

Promotes decarburisation

Forms very hard carbides and thus increases wear resistance

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

Stainless steel

Invar

High speed steel

Heat resisting steel

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

Sulphur

Manganese

Silicon

Phosphorus

Page 4 of 4

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

Around 100°C

Around 0°C

Below 10°K

Above 100°K

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

Precipitation

Heat treatment

Recrystallization

Allotropic change

33. Inconel contains

80% nickel and 20% chromium

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

80% nickel, 14% chromium and 6% iron

65% nickel, 15% chromium and 20% iron

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

Sulphur

Manganese

Phosphorus

Silicon

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

Creep

Fatigue strength

Toughness

Resilience

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

Cycle chains

Cast iron pipes

Gas turbine blades

Flywheel of steam engine

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

Optical microscope

Naked eye

Metallurgical microscope

X-ray techniques

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

Mesomorphous material

None of these

Crystalline material

Amorphous material

39. Pig iron is the name given to

Product of blast furnace made by reduction of iron ore

Iron in molten form in the ladles

Raw material for blast furnace

Iron containing huge quantities of carbon

40. 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

Engineering Materials Practice Set-4

Related

Leave a ReplyCancel reply

Secured Payments

Protection

Engineering Materials Practice Set-4

Share this Now with Friends:

Related

Leave a ReplyCancel reply

Secured Payments

Protection