Engineering Materials Practice Set-5

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1. Delta iron occurs at temperature of

Room temperature

Between 910°C and 1400°C

Above melting point

Between 1400°C and 1539°C

2. Mild steel belongs to the following category

Low carbon steel

Medium carbon steel

High carbon steel

Alloy steel

3. The steel widely used for motor car crankshafts is

Nickel steel

Nickel-chrome steel

Chrome steel

Silicon steel

4. 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

5. The percentage of carbon in low carbon steel is

0.05%

0.15%

0.3%

0.5%

6. Following elements have face-centered cubic structure

Mg, Zn, Ti, Zr, Br, Cd

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

All of the above

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

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

High pressure and load

Elevated temperatures

Light load and pressure

Large surface wear

8. Which is false statement about properties of aluminium?

Modulus of elasticity is fairly low

Wear resistance is very good

Creep strength limits its use to fairly low temperatures

Fatigue strength is not high

9. 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

Suddenly in a suitable cooling medium

Any one of these

In still air

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

Ductility

Resilience

Stiffness

Plasticity

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

Nodular cast iron

Malleable cast iron

White cast iron

Alloy cast iron

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

Cementite

Pearlite

Austenite

Ferrite

13. 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

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

Monel metal

Babbitt metal

Nichrome

Phosphor bronze

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

Increase wear resistance

Increase hardenability

Reduce machinability

Increase endurance strength

16. Balls for ball bearings are made of

Mild steel

Cast iron

Carbon-chrome steel

Stainless steel

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

Twelve

Twenty

Six

Eighteen

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

Fatigue

Creep

Hot hardness

Hot tempering

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

Decrease

First increase and then decrease

Increase

Remain constant

20. Neutral solution is one which has pH value

Equal to 7

Less than 7

pH value has nothing to do with neutral solution

Greater than 7

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21. 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

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

Shot peening

Surface decarburisation

Nitriding of surface

Cold working

23. White cast iron has

High compressive strength

Carbon in the form of carbide

Low tensile strength

All of these

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

Stack

Tyres

Throat

Bosh

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

Asbestos cement

Concrete

Cast iron

Vitrified clay

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

Electroplating

Induction hardening

Nitriding

Cyaniding

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

Hot working

Normalizing

Annealing

Tempering

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

(B) Whiteheart cast iron

(C) Both (A) and (B)

(D) None of these

(A) Blackheart cast iron

29. 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

30. 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

Air is burning out silicon and manganese

Silicon and manganese has burnt and carbon has started oxidizing

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

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

Fracture due to high impact loads

Deformation under stress

None of the above

Externally applied forces with breakdown or yielding

32. The molecules in a solid move

In a haphazard way

Back and forth like tiny pendulums

In a random manner

In circular motion

33. Brass is an alloy of

Copper, tin and zinc

Copper and zinc

None of these

Copper and tin

34. Foundry crucible is made of

Lead

German silver

Mild steel

Graphite

35. 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 average grain size is a minimum

The grain size increases very rapidly

36. Isotropic materials are those which have the same

Elastic properties in all directions

Thermal properties in all directions

Stresses induced in all directions

Electric and magnetic properties in all directions

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

Exists in several crystal forms at different temperatures

Has a fixed structure under all conditions

Responds to heat treatment

Has its atoms distributed in a random pattern

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

Face centered cubic space lattice

Body centered cubic space lattice

None of these

Close packed hexagonal space lattice

39. The elastic stress strain behavior of rubber is

Nonlinear

Plastic

No fixed relationship

Linear

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

Fatigue

Endurance

Plastic deformation

Creep

Engineering Materials Practice Set-5

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