Engineering Materials Practice Set-5

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

Vitrified clay

Cast iron

Concrete

Asbestos cement

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

Shot peening

Cold working

Nitriding of surface

Surface decarburisation

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

First increase and then decrease

Decrease

Remain constant

Increase

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

Air is burning out silicon and manganese

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

Silicon and manganese has burnt and carbon has started oxidizing

5. Malleability of a material can be defined as

All of the above

Ability to undergo large permanent deformations in tension

Ability to recover its original form

Ability to undergo large permanent deformations in compression

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

Austenite

Ferrite

Pearlite

Cementite

7. 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

8. 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

9. Mild steel belongs to the following category

Low carbon steel

High carbon steel

Alloy steel

Medium carbon steel

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

Deformation under stress

None of the above

Fracture due to high impact loads

Externally applied forces with breakdown or yielding

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

Twenty

Eighteen

Six

Twelve

12. 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

13. 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

Any one of these

Suddenly in a suitable cooling medium

Slowly in the furnace

14. Which is false statement about properties of aluminium?

Wear resistance is very good

Modulus of elasticity is fairly low

Fatigue strength is not high

Creep strength limits its use to fairly low temperatures

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

Elevated temperatures

Light load and pressure

High pressure and load

Large surface wear

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

Normalizing

Hot working

Annealing

Tempering

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

Cyaniding

Induction hardening

Electroplating

Nitriding

18. 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

19. Neutral solution is one which has pH value

Equal to 7

Less than 7

Greater than 7

pH value has nothing to do with neutral solution

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

Throat

Bosh

Stack

Tyres

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

Malleable cast iron

Nodular cast iron

Alloy cast iron

White cast iron

22. 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

23. Brass is an alloy of

Copper and zinc

None of these

Copper and tin

Copper, tin and zinc

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

Reduce machinability

Increase endurance strength

Increase wear resistance

Increase hardenability

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

Resilience

Stiffness

Plasticity

Ductility

26. White cast iron has

Low tensile strength

High compressive strength

Carbon in the form of carbide

All of these

27. 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

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

Eutectic cast irons

None of these

Hypereutectic cast irons

Hypoeutectic cast irons

29. The elastic stress strain behavior of rubber is

Linear

Plastic

No fixed relationship

Nonlinear

30. The molecules in a solid move

In a haphazard way

In circular motion

In a random manner

Back and forth like tiny pendulums

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

Hot tempering

Creep

Hot hardness

Fatigue

32. The percentage of carbon in low carbon steel is

0.5%

0.05%

0.15%

0.3%

33. Foundry crucible is made of

Lead

German silver

Graphite

Mild steel

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

The grain size increases very rapidly

The average grain size is a minimum

There is no change in grain size

The grain size first increases and then decreases very rapidly

35. Balls for ball bearings are made of

Cast iron

Mild steel

Stainless steel

Carbon-chrome steel

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

Has its atoms distributed in a random pattern

Has a fixed structure under all conditions

Exists in several crystal forms at different temperatures

Responds to heat treatment

37. Closed packed hexagonal space lattice is found in

Alpha-iron, tungsten, chromium and molybdenum

Zinc, magnesium, cobalt, cadmium, antimony and bismuth

None of the above

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

38. The steel widely used for motor car crankshafts is

Chrome steel

Silicon steel

Nickel-chrome steel

Nickel steel

39. Delta iron occurs at temperature of

Above melting point

Room temperature

Between 1400°C and 1539°C

Between 910°C and 1400°C

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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