Engineering Materials Practice Set-5

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

Plasticity

Ductility

Stiffness

Resilience

2. Balls for ball bearings are made of

Stainless steel

Cast iron

Mild steel

Carbon-chrome steel

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

Hypereutectic cast irons

None of these

Eutectic cast irons

Hypoeutectic cast irons

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

Slowly in the furnace

Suddenly in a suitable cooling medium

Any one of these

In still air

5. Isotropic materials are those which have the same

Stresses induced in all directions

Elastic properties in all directions

Thermal properties in all directions

Electric and magnetic properties in all directions

6. The percentage of carbon in low carbon steel is

0.05%

0.5%

0.15%

0.3%

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

Vitrified clay

Concrete

Cast iron

Asbestos cement

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

Hot hardness

Fatigue

Hot tempering

Creep

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

(B) Whiteheart cast iron

(D) None of these

(A) Blackheart cast iron

(C) Both (A) and (B)

10. 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

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

Surface decarburisation

Nitriding of surface

Shot peening

Cold working

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

Pearlite

Austenite

Cementite

Ferrite

13. The elastic stress strain behavior of rubber is

Plastic

Linear

No fixed relationship

Nonlinear

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

Decrease

First increase and then decrease

Remain constant

Increase

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

Large surface wear

High pressure and load

Elevated temperatures

Light load and pressure

16. The molecules in a solid move

Back and forth like tiny pendulums

In a random manner

In a haphazard way

In circular motion

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

Induction hardening

Electroplating

Cyaniding

Nitriding

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

Fracture due to high impact loads

Deformation under stress

None of the above

Externally applied forces with breakdown or yielding

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

Fatigue

Creep

Endurance

Plastic deformation

20. The steel widely used for motor car crankshafts is

Nickel steel

Chrome steel

Silicon steel

Nickel-chrome steel

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21. 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 crystals grow bigger in size

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

At which change of allotropic form takes place

22. Malleability of a material can be defined as

Ability to undergo large permanent deformations in tension

Ability to recover its original form

All of the above

Ability to undergo large permanent deformations in compression

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

Babbitt metal

Monel metal

Nichrome

Phosphor bronze

24. Following elements have face-centered cubic structure

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

All of the above

Mg, Zn, Ti, Zr, Br, Cd

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

There is no change in grain size

The average grain size is a minimum

The grain size first increases and then decreases very rapidly

The grain size increases very rapidly

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

Normalizing

Hot working

Tempering

Annealing

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

Alloy cast iron

White cast iron

Nodular cast iron

Malleable cast iron

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

None of these

Close packed hexagonal space lattice

Face centered cubic space lattice

Body centered cubic space lattice

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

Increase hardenability

Reduce machinability

Increase wear resistance

Increase endurance strength

30. White cast iron has

All of these

High compressive strength

Carbon in the form of carbide

Low tensile strength

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31. Brass is an alloy of

Copper and tin

Copper, tin and zinc

None of these

Copper and zinc

32. Mild steel belongs to the following category

Low carbon steel

Medium carbon steel

High carbon steel

Alloy steel

33. Which is false statement about properties of aluminium?

Creep strength limits its use to fairly low temperatures

Fatigue strength is not high

Modulus of elasticity is fairly low

Wear resistance is very good

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

Exists in several crystal forms at different temperatures

Responds to heat treatment

Has its atoms distributed in a random pattern

Has a fixed structure under all conditions

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

Throat

Tyres

Stack

Bosh

36. Closed packed hexagonal space lattice is found in

None of the above

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

Zinc, magnesium, cobalt, cadmium, antimony and bismuth

Alpha-iron, tungsten, chromium and molybdenum

37. Delta iron occurs at temperature of

Room temperature

Between 910°C and 1400°C

Above melting point

Between 1400°C and 1539°C

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

Air is burning out silicon and manganese

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

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

Twenty

Eighteen

Twelve

Six

40. Foundry crucible is made of

German silver

Graphite

Mild steel

Lead

Engineering Materials Practice Set-5

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