Engineering Materials Practice Set-5

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

Endurance

Plastic deformation

Creep

Fatigue

2. 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

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

Plasticity

Resilience

Stiffness

Ductility

4. The molecules in a solid move

Back and forth like tiny pendulums

In a haphazard way

In a random manner

In circular motion

5. The elastic stress strain behavior of rubber is

No fixed relationship

Plastic

Linear

Nonlinear

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

Induction hardening

Electroplating

Nitriding

Cyaniding

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

(B) Whiteheart cast iron

(A) Blackheart cast iron

(D) None of these

(C) Both (A) and (B)

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

The grain size increases very rapidly

There is no change in grain size

The grain size first increases and then decreases very rapidly

The average grain size is a minimum

9. 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

10. 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

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11. Isotropic materials are those which have the same

Electric and magnetic properties in all directions

Stresses induced in all directions

Thermal properties in all directions

Elastic properties in all directions

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

None of these

Close packed hexagonal space lattice

Body centered cubic space lattice

Face centered cubic space lattice

13. 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

14. White cast iron has

High compressive strength

Carbon in the form of carbide

All of these

Low tensile strength

15. Mild steel belongs to the following category

Low carbon steel

High carbon steel

Medium carbon steel

Alloy steel

16. The steel widely used for motor car crankshafts is

Nickel-chrome steel

Nickel steel

Chrome steel

Silicon steel

17. 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

18. Brass is an alloy of

Copper and zinc

None of these

Copper, tin and zinc

Copper and tin

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

Throat

Bosh

Tyres

Stack

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

Ferrite

Austenite

Cementite

Pearlite

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21. 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

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

Hot working

Annealing

Tempering

Normalizing

23. The percentage of carbon in low carbon steel is

0.3%

0.05%

0.5%

0.15%

24. Delta iron occurs at temperature of

Above melting point

Between 910°C and 1400°C

Room temperature

Between 1400°C and 1539°C

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

White cast iron

Nodular cast iron

Alloy cast iron

Malleable cast iron

26. Malleability of a material can be defined as

All of the above

Ability to undergo large permanent deformations in compression

Ability to recover its original form

Ability to undergo large permanent deformations in tension

27. Closed packed hexagonal space lattice is found in

Alpha-iron, tungsten, chromium and molybdenum

Zinc, magnesium, cobalt, cadmium, antimony and bismuth

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

None of the above

28. Foundry crucible is made of

German silver

Lead

Mild steel

Graphite

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

First increase and then decrease

Increase

Remain constant

Decrease

30. 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

Slowly in the furnace

In still air

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

Cold working

Nitriding of surface

Surface decarburisation

Shot peening

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

None of the above

Fracture due to high impact loads

Deformation under stress

Externally applied forces with breakdown or yielding

33. Balls for ball bearings are made of

Stainless steel

Carbon-chrome steel

Cast iron

Mild steel

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

Responds to heat treatment

Has a fixed structure under all conditions

Has its atoms distributed in a random pattern

Exists in several crystal forms at different temperatures

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

Twelve

Twenty

Eighteen

Six

36. Which is false statement about properties of aluminium?

Fatigue strength is not high

Modulus of elasticity is fairly low

Wear resistance is very good

Creep strength limits its use to fairly low temperatures

37. 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

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

Increase wear resistance

Increase hardenability

Reduce machinability

Increase endurance strength

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

Hot hardness

Fatigue

Hot tempering

Creep

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

Concrete

Cast iron

Vitrified clay

Asbestos cement

Engineering Materials Practice Set-5

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