Engineering Materials Practice Set-5

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1. 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

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

Face centered cubic space lattice

Close packed hexagonal space lattice

None of these

Body centered cubic space lattice

3. Malleability of a material can be defined as

Ability to undergo large permanent deformations in tension

All of the above

Ability to recover its original form

Ability to undergo large permanent deformations in compression

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

Large surface wear

Elevated temperatures

High pressure and load

Light load and pressure

5. Balls for ball bearings are made of

Cast iron

Mild steel

Carbon-chrome steel

Stainless steel

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

Has a fixed structure under all conditions

Exists in several crystal forms at different temperatures

Has its atoms distributed in a random pattern

Responds to heat treatment

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

(A) Blackheart cast iron

(D) None of these

(B) Whiteheart cast iron

(C) Both (A) and (B)

8. Neutral solution is one which has pH value

Greater than 7

Equal to 7

Less than 7

pH value has nothing to do with neutral solution

9. Brass is an alloy of

Copper and zinc

None of these

Copper, tin and zinc

Copper and tin

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

Six

Twenty

Twelve

Eighteen

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11. Delta iron occurs at temperature of

Between 1400°C and 1539°C

Between 910°C and 1400°C

Above melting point

Room temperature

12. The molecules in a solid move

In a random manner

In circular motion

In a haphazard way

Back and forth like tiny pendulums

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

Fatigue

Creep

Endurance

Plastic deformation

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

Ductility

Plasticity

Stiffness

Resilience

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

Phosphor bronze

Monel metal

Babbitt metal

Nichrome

16. Mild steel belongs to the following category

Medium carbon steel

Low carbon steel

Alloy steel

High carbon steel

17. Isotropic materials are those which have the same

Elastic properties in all directions

Stresses induced in all directions

Thermal properties in all directions

Electric and magnetic properties in all directions

18. Following elements have face-centered cubic structure

Mg, Zn, Ti, Zr, Br, Cd

All of the above

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

19. Foundry crucible is made of

Lead

Graphite

Mild steel

German silver

20. The percentage of carbon in low carbon steel is

0.05%

0.15%

0.5%

0.3%

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21. The steel widely used for motor car crankshafts is

Silicon steel

Nickel-chrome steel

Nickel steel

Chrome steel

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

Tyres

Bosh

Throat

Stack

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

Annealing

Hot working

Tempering

Normalizing

24. 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

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

First increase and then decrease

Remain constant

Decrease

Increase

26. 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

In still air

Any one of these

Suddenly in a suitable cooling medium

27. White cast iron has

High compressive strength

All of these

Carbon in the form of carbide

Low tensile strength

28. Which is false statement about properties of aluminium?

Creep strength limits its use to fairly low temperatures

Wear resistance is very good

Modulus of elasticity is fairly low

Fatigue strength is not high

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

Increase wear resistance

Increase hardenability

Reduce machinability

Increase endurance strength

30. Recrystallization temperature is one

At which change of allotropic form takes place

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 crystals grow bigger in size

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

Cementite

Pearlite

Austenite

Ferrite

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

Shot peening

Cold working

Surface decarburisation

Nitriding of surface

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

Nitriding

Induction hardening

Electroplating

Cyaniding

34. 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

35. 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

Silicon and manganese has burnt and carbon has started oxidizing

Air is burning out silicon and manganese

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

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

Vitrified clay

Asbestos cement

Cast iron

Concrete

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

Hypoeutectic cast irons

Hypereutectic cast irons

None of these

Eutectic cast irons

38. The elastic stress strain behavior of rubber is

Linear

Plastic

No fixed relationship

Nonlinear

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

Creep

Hot hardness

Hot tempering

Fatigue

40. Closed packed hexagonal space lattice is found in

Alpha-iron, tungsten, chromium and molybdenum

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

Zinc, magnesium, cobalt, cadmium, antimony and bismuth

None of the above

Engineering Materials Practice Set-5

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