Engineering Materials Practice Set-5

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1. 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

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

Air is burning out silicon and manganese

2. 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

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

Twelve

Eighteen

Twenty

Six

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

Cold working

Surface decarburisation

Nitriding of surface

Shot peening

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

Resilience

Ductility

Stiffness

Plasticity

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

Vitrified clay

Asbestos cement

Concrete

Cast iron

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

Large surface wear

High pressure and load

Light load and pressure

Elevated temperatures

8. Mild steel belongs to the following category

High carbon steel

Low carbon steel

Medium carbon steel

Alloy steel

9. Closed packed hexagonal space lattice is found in

None of the above

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

Alpha-iron, tungsten, chromium and molybdenum

Zinc, magnesium, cobalt, cadmium, antimony and bismuth

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

Increase wear resistance

Increase endurance strength

Increase hardenability

Reduce machinability

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

Has a fixed structure under all conditions

Responds to heat treatment

Has its atoms distributed in a random pattern

Exists in several crystal forms at different temperatures

12. Foundry crucible is made of

German silver

Lead

Graphite

Mild steel

13. Isotropic materials are those which have the same

Thermal properties in all directions

Stresses induced in all directions

Electric and magnetic properties in all directions

Elastic properties in all directions

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

Eutectic cast irons

Hypereutectic cast irons

None of these

Hypoeutectic cast irons

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

Fatigue

Creep

Endurance

Plastic deformation

16. White cast iron has

Carbon in the form of carbide

Low tensile strength

High compressive strength

All of these

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

Hot hardness

Fatigue

Creep

Hot tempering

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

Deformation under stress

Fracture due to high impact loads

Externally applied forces with breakdown or yielding

None of the above

19. Brass is an alloy of

Copper and tin

None of these

Copper, tin and zinc

Copper and zinc

20. The percentage of carbon in low carbon steel is

0.5%

0.15%

0.05%

0.3%

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

Remain constant

First increase and then decrease

Decrease

Increase

22. Following elements have face-centered cubic structure

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

All of the above

Mg, Zn, Ti, Zr, Br, Cd

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

23. Balls for ball bearings are made of

Mild steel

Cast iron

Carbon-chrome steel

Stainless steel

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

Babbitt metal

Phosphor bronze

Nichrome

Monel metal

25. Which is false statement about properties of aluminium?

Creep strength limits its use to fairly low temperatures

Modulus of elasticity is fairly low

Fatigue strength is not high

Wear resistance is very good

26. Delta iron occurs at temperature of

Between 1400°C and 1539°C

Above melting point

Room temperature

Between 910°C and 1400°C

27. 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

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

Normalizing

Tempering

Annealing

Hot working

29. The elastic stress strain behavior of rubber is

No fixed relationship

Linear

Plastic

Nonlinear

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 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

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31. Neutral solution is one which has pH value

Equal to 7

Greater than 7

Less than 7

pH value has nothing to do with neutral solution

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

Alloy cast iron

Malleable cast iron

Nodular cast iron

White cast iron

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

Ferrite

Pearlite

Austenite

Cementite

34. Malleability of a material can be defined as

All of the above

Ability to undergo large permanent deformations in compression

Ability to undergo large permanent deformations in tension

Ability to recover its original form

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

Face centered cubic space lattice

Body centered cubic space lattice

Close packed hexagonal space lattice

None of these

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

Electroplating

Induction hardening

Nitriding

Cyaniding

37. The molecules in a solid move

Back and forth like tiny pendulums

In a random manner

In circular motion

In a haphazard way

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

Bosh

Tyres

Stack

Throat

39. 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

40. The steel widely used for motor car crankshafts is

Nickel-chrome steel

Silicon steel

Nickel steel

Chrome steel

Engineering Materials Practice Set-5

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