Engineering Materials Practice Set-5

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1. Isotropic materials are those which have the same

Thermal properties in all directions

Elastic properties in all directions

Stresses induced in all directions

Electric and magnetic properties in all directions

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

Body centered cubic space lattice

None of these

Close packed hexagonal space lattice

Face centered cubic space lattice

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

First increase and then decrease

Increase

Decrease

Remain constant

4. Malleability of a material can be defined as

Ability to undergo large permanent deformations in tension

All of the above

Ability to undergo large permanent deformations in compression

Ability to recover its original form

5. Foundry crucible is made of

Graphite

Lead

German silver

Mild steel

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

Eighteen

Twelve

Twenty

Six

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

Silicon and manganese has burnt and carbon has started oxidizing

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

Air is burning out silicon and manganese

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

8. Which is false statement about properties of aluminium?

Modulus of elasticity is fairly low

Fatigue strength is not high

Wear resistance is very good

Creep strength limits its use to fairly low temperatures

9. 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

10. The percentage of carbon in low carbon steel is

0.05%

0.5%

0.3%

0.15%

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11. Mild steel belongs to the following category

Alloy steel

Low carbon steel

High carbon steel

Medium carbon steel

12. The elastic stress strain behavior of rubber is

Plastic

Linear

Nonlinear

No fixed relationship

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

None of these

Hypereutectic cast irons

Eutectic cast irons

Hypoeutectic cast irons

14. 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

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

Stack

Throat

Tyres

Bosh

16. Recrystallization temperature is one

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

At which crystals grow bigger in size

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

17. 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

Any one of these

In still air

Suddenly in a suitable cooling medium

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

Vitrified clay

Asbestos cement

Concrete

Cast iron

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

Fatigue

Hot tempering

Hot hardness

Creep

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

Increase endurance strength

Increase hardenability

Increase wear resistance

Reduce machinability

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21. Brass is an alloy of

Copper and tin

Copper, tin and zinc

None of these

Copper and zinc

22. Neutral solution is one which has pH value

Less than 7

Equal to 7

Greater than 7

pH value has nothing to do with neutral solution

23. Delta iron occurs at temperature of

Room temperature

Between 1400°C and 1539°C

Between 910°C and 1400°C

Above melting point

24. The molecules in a solid move

In a haphazard way

Back and forth like tiny pendulums

In circular motion

In a random manner

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

Pearlite

Ferrite

Cementite

Austenite

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

Responds to heat treatment

Has a fixed structure under all conditions

Exists in several crystal forms at different temperatures

Has its atoms distributed in a random pattern

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

Surface decarburisation

Shot peening

Cold working

Nitriding of surface

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

The grain size first increases and then decreases very rapidly

There is no change in grain size

The average grain size is a minimum

The grain size increases very rapidly

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

Babbitt metal

Monel metal

Phosphor bronze

Nichrome

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

Electroplating

Cyaniding

Induction hardening

Nitriding

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31. 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

32. White cast iron has

Carbon in the form of carbide

All of these

Low tensile strength

High compressive strength

33. 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

Mg, Zn, Ti, Zr, Br, Cd

All of the above

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

Plasticity

Stiffness

Resilience

Ductility

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

Annealing

Hot working

Tempering

Normalizing

36. Balls for ball bearings are made of

Carbon-chrome steel

Stainless steel

Cast iron

Mild steel

37. The steel widely used for motor car crankshafts is

Silicon steel

Nickel-chrome steel

Chrome steel

Nickel steel

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

None of the above

Externally applied forces with breakdown or yielding

Deformation under stress

Fracture due to high impact loads

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

(B) Whiteheart cast iron

(D) None of these

(C) Both (A) and (B)

(A) Blackheart cast iron

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

Endurance

Fatigue

Creep

Plastic deformation

Engineering Materials Practice Set-5

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