Engineering Materials Practice Set-5

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1. Foundry crucible is made of

Lead

Graphite

Mild steel

German silver

2. 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

3. 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

4. Balls for ball bearings are made of

Carbon-chrome steel

Mild steel

Stainless steel

Cast iron

5. Malleability of a material can be defined as

Ability to recover its original form

Ability to undergo large permanent deformations in tension

Ability to undergo large permanent deformations in compression

All of the above

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

Malleable cast iron

Alloy cast iron

White cast iron

Nodular cast iron

7. The percentage of carbon in low carbon steel is

0.15%

0.05%

0.5%

0.3%

8. Mild steel belongs to the following category

Low carbon steel

Alloy steel

Medium carbon steel

High carbon steel

9. White cast iron has

High compressive strength

All of these

Low tensile strength

Carbon in the form of carbide

10. 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

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

Cyaniding

Induction hardening

Electroplating

Nitriding

12. 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

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

High pressure and load

Light load and pressure

Elevated temperatures

Large surface wear

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

Concrete

Vitrified clay

Asbestos cement

Cast iron

15. Which is false statement about properties of aluminium?

Modulus of elasticity is fairly low

Wear resistance is very good

Fatigue strength is not high

Creep strength limits its use to fairly low temperatures

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

Plastic deformation

Endurance

Fatigue

Creep

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

Increase hardenability

Reduce machinability

Increase wear resistance

Increase endurance strength

18. The steel widely used for motor car crankshafts is

Nickel-chrome steel

Nickel steel

Chrome steel

Silicon steel

19. Brass is an alloy of

Copper and tin

Copper, tin and zinc

None of these

Copper and zinc

20. Delta iron occurs at temperature of

Between 1400°C and 1539°C

Between 910°C and 1400°C

Above melting point

Room temperature

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21. The molecules in a solid move

In circular motion

In a random manner

In a haphazard way

Back and forth like tiny pendulums

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

Annealing

Tempering

Hot working

Normalizing

23. Following elements have face-centered cubic structure

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

Mg, Zn, Ti, Zr, Br, Cd

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

All of the above

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

Shot peening

Surface decarburisation

Cold working

Nitriding of surface

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

Externally applied forces with breakdown or yielding

Fracture due to high impact loads

Deformation under stress

None of the above

26. 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

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

Bosh

Tyres

Throat

Stack

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

Resilience

Plasticity

Stiffness

Ductility

29. Neutral solution is one which has pH value

pH value has nothing to do with neutral solution

Equal to 7

Less than 7

Greater than 7

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

Cementite

Pearlite

Ferrite

Austenite

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

Any one of these

In still air

Suddenly in a suitable cooling medium

Slowly in the furnace

32. The elastic stress strain behavior of rubber is

Plastic

No fixed relationship

Linear

Nonlinear

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

None of these

Hypereutectic cast irons

Hypoeutectic cast irons

Eutectic cast irons

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

There is no change in grain size

The grain size first increases and then decreases very rapidly

The grain size increases very rapidly

The average grain size is a minimum

35. 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

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

Twenty

Twelve

Eighteen

Six

37. Recrystallization temperature is one

At which change of allotropic form takes place

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

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

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

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

Air is burning out silicon and manganese

Silicon and manganese has burnt and carbon has started oxidizing

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

(D) None of these

(A) Blackheart cast iron

(C) Both (A) and (B)

(B) Whiteheart cast iron

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

Fatigue

Hot hardness

Hot tempering

Creep

Engineering Materials Practice Set-5

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