Engineering Materials Practice Set-5

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1. The coordination number of a face centered cubic space lattice is

Twelve

Six

Twenty

Eighteen

2. Which of the following constituents of steels is softest and least strong?

Austenite

Cementite

Ferrite

Pearlite

3. Malleability of a material can be defined as

Ability to undergo large permanent deformations in tension

Ability to recover its original form

Ability to undergo large permanent deformations in compression

All of the above

4. The type of space lattice found in alpha-iron is

Body centered cubic space lattice

None of these

Face centered cubic space lattice

Close packed hexagonal space lattice

5. The stiffness is the ability of a material to resist

Externally applied forces with breakdown or yielding

None of the above

Fracture due to high impact loads

Deformation under stress

6. Neutral solution is one which has pH value

Less than 7

Greater than 7

Equal to 7

pH value has nothing to do with neutral solution

7. Recrystallization temperature is one

At which new spherical crystals first begin to form from the old deformed one when a strained metal is heated

At which change of allotropic form takes place

At which crystals first start forming from molten metal when it is cooled

At which crystals grow bigger in size

8. The property of a material essential for spring materials is

Ductility

Plasticity

Stiffness

Resilience

9. When elements like nickel, chromium, copper and molybdenum are added to the molten cast iron, it produces

Alloy cast iron

Nodular cast iron

Malleable cast iron

White cast iron

10. Foundry crucible is made of

German silver

Graphite

Lead

Mild steel

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11. Materials after cold working are subjected to following process to relieve stresses

Tempering

Hot working

Annealing

Normalizing

12. The charge is fed into the blast furnace through the

Throat

Bosh

Stack

Tyres

13. Tin base white metals are used where the bearings are subjected to

Elevated temperatures

Large surface wear

High pressure and load

Light load and pressure

14. The molecules in a solid move

Back and forth like tiny pendulums

In a haphazard way

In a random manner

In circular motion

15. Closed packed hexagonal space lattice is found in

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

None of the above

Zinc, magnesium, cobalt, cadmium, antimony and bismuth

Alpha-iron, tungsten, chromium and molybdenum

16. In full annealing, the hypo eutectoid steel is heated from 30°C to 50°C above the upper critical temperature and then cooled

In still air

Any one of these

Suddenly in a suitable cooling medium

Slowly in the furnace

17. The percentage of carbon in low carbon steel is

0.5%

0.3%

0.15%

0.05%

18. White cast iron has

High compressive strength

Carbon in the form of carbide

Low tensile strength

All of these

19. The brown smoke during the operation of a Bessemer converter indicates that the

The converter must be titled to remove the contents of the converter

The brown smoke does not occur during the operation of a Bessemer converter

Silicon and manganese has burnt and carbon has started oxidizing

Air is burning out silicon and manganese

20. The ultimate tensile strength of low carbon steel by working at a high strain rate will

First increase and then decrease

Decrease

Increase

Remain constant

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21. Which is false statement about case hardening? Case hardening is done by

Induction hardening

Electroplating

Cyaniding

Nitriding

22. Mild steel belongs to the following category

Alloy steel

Low carbon steel

High carbon steel

Medium carbon steel

23. Which is false statement about properties of aluminium?

Fatigue strength is not high

Wear resistance is very good

Creep strength limits its use to fairly low temperatures

Modulus of elasticity is fairly low

24. Brass is an alloy of

Copper and tin

Copper, tin and zinc

Copper and zinc

None of these

25. A material is known as allotropic or polymorphic if it

Exists in several crystal forms at different temperatures

Has its atoms distributed in a random pattern

Has a fixed structure under all conditions

Responds to heat treatment

26. Delta iron occurs at temperature of

Above melting point

Between 910°C and 1400°C

Between 1400°C and 1539°C

Room temperature

27. The ability of a material to resist softening at high temperature is known as

Hot tempering

Creep

Hot hardness

Fatigue

28. Lead is poured into the joint between two pipes. These pipes may be made of

Vitrified clay

Cast iron

Asbestos cement

Concrete

29. Iron-carbon alloys containing 1.7 to 4.3% carbon are known as

Eutectic cast irons

Hypoeutectic cast irons

Hypereutectic cast irons

None of these

30. Which of the following metal is used in making electrical resistance wire for electric furnaces and heating elements?

Nichrome

Babbitt metal

Monel metal

Phosphor bronze

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31. When low carbon steel is heated up to lower critical temperature

The grain size first increases and then decreases very rapidly

The average grain size is a minimum

There is no change in grain size

The grain size increases very rapidly

32. Which of the following display properties similar to that of steel?

(D) None of these

(A) Blackheart cast iron

(B) Whiteheart cast iron

(C) Both (A) and (B)

33. Balls for ball bearings are made of

Stainless steel

Cast iron

Carbon-chrome steel

Mild steel

34. Following elements have face-centered cubic structure

All of the above

A iron (below 910°C and between 1400 to 1539°C), W

Gamma iron (910° to 1400°C), Cu, Ag, Au, Al, Ni, Pb, Pt

Mg, Zn, Ti, Zr, Br, Cd

35. The steel widely used for motor car crankshafts is

Nickel-chrome steel

Chrome steel

Nickel steel

Silicon steel

36. A small percentage of boron is added to steel in order to

Reduce machinability

Increase hardenability

Increase endurance strength

Increase wear resistance

37. Isotropic materials are those which have the same

Elastic properties in all directions

Thermal properties in all directions

Electric and magnetic properties in all directions

Stresses induced in all directions

38. Which of the following is not the correct method of increasing fatigue limit?

Cold working

Nitriding of surface

Surface decarburisation

Shot peening

39. The elastic stress strain behavior of rubber is

Plastic

Linear

No fixed relationship

Nonlinear

40. Slow plastic deformation of metals under a constant stress is known as

Fatigue

Creep

Endurance

Plastic deformation

Engineering Materials Practice Set-5

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