Engineering Materials Practice Set-5

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1. Recrystallization temperature is one

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 crystals first start forming from molten metal when it is cooled

At which change of allotropic form takes place

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

Nitriding

Electroplating

Induction hardening

Cyaniding

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

Cold working

Nitriding of surface

Shot peening

Surface decarburisation

4. Isotropic materials are those which have the same

Thermal properties in all directions

Electric and magnetic properties in all directions

Elastic properties in all directions

Stresses induced in all directions

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

Pearlite

Cementite

Austenite

Ferrite

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

Asbestos cement

Vitrified clay

Concrete

Cast iron

7. 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

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

White cast iron

Alloy cast iron

Nodular cast iron

Malleable cast iron

9. Malleability of a material can be defined as

Ability to undergo large permanent deformations in compression

Ability to undergo large permanent deformations in tension

All of the above

Ability to recover its original form

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

Monel metal

Nichrome

Phosphor bronze

Babbitt metal

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11. Foundry crucible is made of

Mild steel

Graphite

Lead

German silver

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

Responds to heat treatment

Has its atoms distributed in a random pattern

Exists in several crystal forms at different temperatures

Has a fixed structure under all conditions

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

(B) Whiteheart cast iron

(A) Blackheart cast iron

(D) None of these

(C) Both (A) and (B)

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

Hypoeutectic cast irons

Eutectic cast irons

None of these

Hypereutectic cast irons

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

Stack

Throat

Bosh

Tyres

16. White cast iron has

All of these

Low tensile strength

Carbon in the form of carbide

High compressive strength

17. Mild steel belongs to the following category

High carbon steel

Alloy steel

Medium carbon steel

Low carbon steel

18. Closed packed hexagonal space lattice is found in

Alpha-iron, tungsten, chromium and molybdenum

None of the above

Zinc, magnesium, cobalt, cadmium, antimony and bismuth

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

19. 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

20. Which is false statement about properties of aluminium?

Wear resistance is very good

Fatigue strength is not high

Modulus of elasticity is fairly low

Creep strength limits its use to fairly low temperatures

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

Plastic deformation

Endurance

Creep

Fatigue

22. Delta iron occurs at temperature of

Between 910°C and 1400°C

Above melting point

Between 1400°C and 1539°C

Room temperature

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

Stiffness

Ductility

Resilience

Plasticity

24. Neutral solution is one which has pH value

Greater than 7

Less than 7

Equal to 7

pH value has nothing to do with neutral solution

25. 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

Silicon and manganese has burnt and carbon has started oxidizing

Air is burning out silicon and manganese

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

26. The steel widely used for motor car crankshafts is

Nickel-chrome steel

Silicon steel

Chrome steel

Nickel steel

27. Brass is an alloy of

Copper and tin

None of these

Copper, tin and zinc

Copper and zinc

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

High pressure and load

Elevated temperatures

Large surface wear

Light load and pressure

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

Hot tempering

Creep

Fatigue

Hot hardness

30. 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

Slowly in the furnace

Any one of these

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

Reduce machinability

Increase hardenability

Increase wear resistance

Increase endurance strength

32. The molecules in a solid move

In circular motion

Back and forth like tiny pendulums

In a haphazard way

In a random manner

33. Balls for ball bearings are made of

Stainless steel

Carbon-chrome steel

Cast iron

Mild steel

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

None of the above

Fracture due to high impact loads

Deformation under stress

Externally applied forces with breakdown or yielding

35. The elastic stress strain behavior of rubber is

No fixed relationship

Nonlinear

Linear

Plastic

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

Twenty

Eighteen

Six

Twelve

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

Face centered cubic space lattice

Close packed hexagonal space lattice

Body centered cubic space lattice

None of these

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

Annealing

Normalizing

Tempering

Hot working

39. The percentage of carbon in low carbon steel is

0.05%

0.3%

0.15%

0.5%

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

Increase

Remain constant

First increase and then decrease

Decrease

Engineering Materials Practice Set-5

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