Engineering Materials Practice Set-5

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1. Foundry crucible is made of

Mild steel

German silver

Graphite

Lead

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

Suddenly in a suitable cooling medium

Any one of these

In still air

Slowly in the furnace

3. Delta iron occurs at temperature of

Room temperature

Between 1400°C and 1539°C

Between 910°C and 1400°C

Above melting point

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

Vitrified clay

Concrete

Asbestos cement

Cast iron

5. Recrystallization temperature is one

At which new spherical crystals first begin to form from the old deformed one when a strained metal is heated

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

6. The elastic stress strain behavior of rubber is

Linear

Nonlinear

Plastic

No fixed relationship

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

Annealing

Tempering

Normalizing

Hot working

8. Balls for ball bearings are made of

Mild steel

Carbon-chrome steel

Cast iron

Stainless steel

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

Nitriding

Electroplating

Cyaniding

Induction hardening

10. The molecules in a solid move

In circular motion

Back and forth like tiny pendulums

In a haphazard way

In a random manner

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

Close packed hexagonal space lattice

Body centered cubic space lattice

None of these

Face centered cubic space lattice

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

Plasticity

Stiffness

Ductility

Resilience

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

(B) Whiteheart cast iron

(C) Both (A) and (B)

(A) Blackheart cast iron

(D) None of these

14. White cast iron has

Carbon in the form of carbide

High compressive strength

Low tensile strength

All of these

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

Creep

Fatigue

Endurance

Plastic deformation

16. Neutral solution is one which has pH value

Less than 7

pH value has nothing to do with neutral solution

Equal to 7

Greater than 7

17. The steel widely used for motor car crankshafts is

Nickel steel

Nickel-chrome steel

Chrome steel

Silicon steel

18. 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

19. Isotropic materials are those which have the same

Stresses induced in all directions

Electric and magnetic properties in all directions

Elastic properties in all directions

Thermal properties in all directions

20. Mild steel belongs to the following category

Medium carbon steel

Alloy steel

High carbon steel

Low carbon steel

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

Has its atoms distributed in a random pattern

Exists in several crystal forms at different temperatures

Responds to heat treatment

Has a fixed structure under all conditions

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

Hypereutectic cast irons

None of these

Eutectic cast irons

Hypoeutectic cast irons

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

The grain size first increases and then decreases very rapidly

There is no change in grain size

The average grain size is a minimum

The grain size increases very rapidly

24. Which is false statement about properties of aluminium?

Wear resistance is very good

Fatigue strength is not high

Creep strength limits its use to fairly low temperatures

Modulus of elasticity is fairly low

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

Reduce machinability

Increase wear resistance

Increase endurance strength

Increase hardenability

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

Bosh

Throat

Stack

Tyres

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

Surface decarburisation

Cold working

Nitriding of surface

Shot peening

28. Closed packed hexagonal space lattice is found in

Alpha-iron, tungsten, chromium and molybdenum

None of the above

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

Zinc, magnesium, cobalt, cadmium, antimony and bismuth

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

Silicon and manganese has burnt and carbon has started oxidizing

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

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

Air is burning out silicon and manganese

30. Brass is an alloy of

None of these

Copper and tin

Copper, tin and zinc

Copper and zinc

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

Light load and pressure

High pressure and load

Elevated temperatures

Large surface wear

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

Twelve

Eighteen

Six

Twenty

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

Creep

Fatigue

Hot tempering

Hot hardness

34. 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

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

Babbitt metal

Nichrome

Phosphor bronze

Monel metal

36. Following elements have face-centered cubic structure

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

All of the above

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

Mg, Zn, Ti, Zr, Br, Cd

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

Pearlite

Ferrite

Cementite

Austenite

38. The percentage of carbon in low carbon steel is

0.5%

0.3%

0.05%

0.15%

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

Decrease

Remain constant

Increase

First increase and then decrease

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

Deformation under stress

Externally applied forces with breakdown or yielding

Fracture due to high impact loads

None of the above

Engineering Materials Practice Set-5

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