Engineering Materials Practice Set-1

Page 1 of 4

1. Bell metal contains

90% copper and 10% tin

85 - 92% copper and rest tin with little lead and nickel

70% copper and 30% zinc

70 - 75% copper and rest tin

2. Amorphous material is one

In which there is no definite atomic structure and atoms exist in a random pattern just as in a liquid

Which is not attacked by phosphorous

Which emits fumes on melting

In which atoms align themselves in a geometric pattern upon solidification

3. In a hardening process, the hypo-eutectoid steel is

Heated from 30°C to 50°C above the upper critical temperature and then cooled slowly in the furnace

Heated from 30°C to 50°C above the upper critical temperature and then cooled suddenly in a suitable cooling medium

Heated from 30°C to 50°C above the upper critical temperature and then cooled in still air

Heated below or closes to the lower critical temperature and then cooled slowly

4. Pipes for bicycle frames are made of

Forged steel

Cast steel

Cold rolled steel

Hot rolled steel

5. Which of the following statement is wrong?

The amount of cementite increases with the increase in percentage of carbon in iron

The cementite is identified as round particles in the structure

Steel with 0.8% carbon is wholly pearlite

A mechanical mixture of 87% cementite and 13% ferrite is called pearlite

6. A coarse grained steel

Is more ductile and has a less tendency to distort during heat treatment

Is less tough and has a greater tendency to distort during heat treatment

Is less tough and has a less tendency to distort during heat treatment

Is more ductile and has a greater tendency to distort during heat treatment

7. Body centered cubic space lattice is found in

None of the above

Gamma iron, aluminium, copper, lead, silver and nickel

Alpha iron, tungsten, chromium and molybdenum

Zinc, magnesium, cobalt, cadmium, antimony and bismuth

8. When a steel containing __________ 0.8% carbon is cooled slowly below the lower critical point, it consists of ferrite and pearlite.

Equal to

None of these

Less than

More than

9. The composition of silver solder is

Silver, lead, zinc

Silver, tin, nickel

Silver, copper, zinc

Silver, copper, aluminium

10. Nickel in steel

Refines grain size and produces less tendency to carburisation, improves corrosion and heat resistant properties

Improves cutting ability and reduces hardenability

Gives ductility, toughness, tensile strength and anti-corrosion properties

Improves wear resistance, cutting ability and toughness

Page 2 of 4

11. Cemented carbide tools are not found to be suitable for cutting

Brass

Steel

Cast iron

Aluminium

12. When steel containing less than 0.8% carbon is cooled slowly from temperatures above or within the critical range, it consists of

Mainly pearlite

Ferrite and pearlite

Pearlite and cementite

Mainly ferrite

13. Heavy duty leaf and coil springs contain carbon of the following order

0.8%

0.2%

1.0%

0.5%

14. Which of the following has a fine gold colour and is used for imitation jewellery?

Gun metal

Silicon bronze

Aluminium bronze

Babbitt metal

15. The percentage carbon content in wrought iron is about

0.1

0.4

0.02

0.2

16. Elinvar, an alloy used in precision instruments, hair springs for watches, etc. contains the following element as principal alloying element

Aluminium

Iron

Nickel

Copper

17. Which one of the following metals would work-harden more quickly than the others?

Lead

Brass

Copper

Silver

18. In spheroidising process, the steel is

Heated up to the lower critical temperature and then cooled in still air

None of the above

Heated below the lower critical temperature and then cooled slowly

Heated slightly above the lower critical temperature and then cooled slowly to a temperature of 600°C

19. According to Indian standard specifications, SG 400/15 means

Spheroidal graphite cast iron with B.H.N. 400 and minimum tensile strength 15 MPa

Spheroidal graphite cast iron with minimum tensile strength 400 MPa and 15 percent elongation

None of the above

Spheroidal graphite cast iron with minimum compressive strength 400 MPa and 15 percent reduction in area

20. The silicon steel is widely used for

Connecting rods

Motor car crankshafts

Cutting tools

Generators and transformers in the form of laminated cores

Page 3 of 4

21. Pick up the wrong statement Nickel and chromium in steel help in

Providing corrosion resistance

Improving machining properties

Raising the elastic limit

Providing high strength at elevated temperatures

22. Pick up the wrong statement

Aluminium in steel results in excessive grain growth

Nickel and chromium in steel helps in raising the elastic limit and improve the resilience and ductility

Tungsten in steels improves magnetic properties and hardenability

Manganese in steel induces hardness

23. In process annealing, the hypo eutectoid steel is

Heated below or closes to the lower critical temperature and then cooled slowly

Heated from 30°C to 50°C above the upper critical temperature and then cooled slowly in the furnace

Heated from 30°C to 50°C above the upper critical temperature and then cooled in still air

Heated from 30°C to 50°C above the upper critical temperature and then cooled suddenly in a suitable cooling medium

24. Which of the following metal is used for nuclear energy?

Thorium

All of these

Uranium

Niobium

25. Tensile strength of steel can be safely increased by

Adding carbon up to 2.8%

Adding carbon up to 0.83%

Adding carbon up to 6.3%

Adding small quantities of copper

26. The correct composition of Babbitt metal is

87% Sn, 4% Cu, 8% Sb, 1% Al

82% Sn, 4% Cu, 8% Sb, 3% Al, 3% Mg

87.75% Sn, 4% Cu, 8% Sb, 0.25% Bi

90% Sn, 2% Cu, 4% Sb, 2% Bi, 2% Mg

27.

Blast furnace produces following by reduction of iron ore

Cast iron

Pig iron

Malleable iron

Wrought iron

28. Normalising of steel is done to

All of the above

Refine the grain structure

Remove dislocations caused in the internal structure due to hot working

Remove strains caused by cold working

29. The charge of the blast furnace consists of

Calcined ore (1 part), coke (8 parts) and limestone (4 parts)

Calcined ore (8 parts), coke (4 parts) and limestone (1 part)

Calcined ore, coke and limestone all in equal parts

Calcined ore (4 parts), coke (1 part) and limestone (8 parts)

30. Y-alloy contains

5 to 6% tin, 2 to 3% copper and rest aluminium

4 to 4.5% magnesium, 3 to 4% copper and rest aluminium

3.5 to 4.5% copper, 1.2 to 1.7% manganese, 1.8 to 2.3% nickel, 0.6% each of silicon, magnesium and iron, and rest aluminium

3.5 to 4.5% copper, 0.4 to 0.7% magnesium, 0.4 to 0.7% manganese and rest aluminium

Page 4 of 4

31. Which of the following has highest specific strength of all structural materials?

Magnetic steel alloys

Magnesium alloys

Titanium alloys

Chromium alloys

32. Dow metal contains

90% aluminium and 90% copper

94% aluminium, 4% copper and 0.5% Mn, Mg, Si and Fe

92.5% aluminium and, 4% copper, 2% nickel and 1.5% Mg

90% magnesium and 9% aluminium with some copper

33. Brass (alloy of copper and zinc) is an example of

Substitutional solid solution

Interstitial solid solution

All of the above

Intermetallic compounds

34. Iron-carbon alloys containing carbon ________ 4.3% are known as hyper-eutectic cast irons.

More than

None of these

Less than

Equal to

35. For a steel containing 0.8% carbon

There is no critical point

There can be any number of critical points

There are two critical points

There is only one critical point

36. Which of the following impurity in cast iron makes it hard and brittle?

Silicon

Sulphur

Phosphorus

Manganese

37. Steel contains

Alloying elements like chromium, tungsten nickel and copper

Elements like phosphorus, sulphur and silicon in varying quantities

50% or more iron

80% or more iron

38. The temperature required for full annealing in hypereutectoid steel is

30° C to 50° C below upper critical temperature

30° C to 50° C above upper critical temperature

30° C to 50° C above lower critical temperature

30° C to 50° C below lower critical temperature

39. Which of the following alloys does not have copper as one of the constituents?

Monel metal

Nichrome

Constantan

Delta metal

40. The following element can't impart high strength at elevated temperature

Nickel

Silicon

Magnesium

Manganese

Engineering Materials Practice Set-1

Related

Leave a ReplyCancel reply

Secured Payments

Protection

Engineering Materials Practice Set-1

Share this Now with Friends:

Related

Leave a ReplyCancel reply

Secured Payments

Protection