Engineering Materials Practice Set-5

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1. Isotropic materials are those which have the same

Thermal properties in all directions

Electric and magnetic properties in all directions

Stresses induced in all directions

Elastic properties in all directions

2. Mild steel belongs to the following category

Low carbon steel

Alloy steel

High carbon steel

Medium carbon steel

3. The molecules in a solid move

In circular motion

Back and forth like tiny pendulums

In a haphazard way

In a random manner

4. Foundry crucible is made of

German silver

Graphite

Mild steel

Lead

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

(A) Blackheart cast iron

(D) None of these

(C) Both (A) and (B)

(B) Whiteheart cast iron

6. 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

Suddenly in a suitable cooling medium

Any one of these

Slowly in the furnace

7. Neutral solution is one which has pH value

Greater than 7

Less than 7

pH value has nothing to do with neutral solution

Equal to 7

8. The percentage of carbon in low carbon steel is

0.3%

0.5%

0.05%

0.15%

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

Resilience

Ductility

Stiffness

Plasticity

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

Elevated temperatures

Large surface wear

Light load and pressure

High pressure and load

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11. Malleability of a material can be defined as

Ability to undergo large permanent deformations in tension

Ability to undergo large permanent deformations in compression

All of the above

Ability to recover its original form

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

Increase wear resistance

Increase hardenability

Increase endurance strength

Reduce machinability

13. White cast iron has

Carbon in the form of carbide

All of these

High compressive strength

Low tensile strength

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

White cast iron

Alloy cast iron

Malleable cast iron

Nodular cast iron

15. Following elements have face-centered cubic structure

Mg, Zn, Ti, Zr, Br, Cd

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

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

All of the above

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

Cementite

Pearlite

Austenite

Ferrite

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

Plastic deformation

Endurance

Creep

Fatigue

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

Hot hardness

Creep

Hot tempering

Fatigue

19. Which is false statement about properties of aluminium?

Fatigue strength is not high

Modulus of elasticity is fairly low

Wear resistance is very good

Creep strength limits its use to fairly low temperatures

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

Electroplating

Induction hardening

Cyaniding

Nitriding

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

Has its atoms distributed in a random pattern

Responds to heat treatment

Has a fixed structure under all conditions

Exists in several crystal forms at different temperatures

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

Concrete

Cast iron

Asbestos cement

Vitrified clay

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

Air is burning out silicon and manganese

Silicon and manganese has burnt and carbon has started oxidizing

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

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

Monel metal

Babbitt metal

Phosphor bronze

Nichrome

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

Twenty

Eighteen

Twelve

Six

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

Normalizing

Hot working

Tempering

Annealing

27. Closed packed hexagonal space lattice is found in

None of the above

Alpha-iron, tungsten, chromium and molybdenum

Zinc, magnesium, cobalt, cadmium, antimony and bismuth

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

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

Nitriding of surface

Cold working

Shot peening

Surface decarburisation

29. Balls for ball bearings are made of

Mild steel

Stainless steel

Carbon-chrome steel

Cast iron

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

Hypereutectic cast irons

Eutectic cast irons

None of these

Hypoeutectic cast irons

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31. Recrystallization temperature is one

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

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 grow bigger in size

32. Delta iron occurs at temperature of

Between 910°C and 1400°C

Above melting point

Room temperature

Between 1400°C and 1539°C

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

None of the above

Deformation under stress

Externally applied forces with breakdown or yielding

Fracture due to high impact loads

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

Stack

Bosh

Tyres

Throat

35. Brass is an alloy of

Copper, tin and zinc

None of these

Copper and tin

Copper and zinc

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

Remain constant

Increase

First increase and then decrease

Decrease

37. 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 increases very rapidly

The grain size first increases and then decreases very rapidly

38. The elastic stress strain behavior of rubber is

No fixed relationship

Nonlinear

Linear

Plastic

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

Close packed hexagonal space lattice

None of these

Face centered cubic space lattice

Body centered cubic space lattice

40. The steel widely used for motor car crankshafts is

Nickel-chrome steel

Chrome steel

Nickel steel

Silicon steel

Engineering Materials Practice Set-5

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