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Engineering Materials
3

Engineering Materials Practice Set-5

May 13, 2021

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Page 1 of 4

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

Increase hardenability

Increase endurance strength

Increase wear resistance

Reduce machinability

2. Mild steel belongs to the following category

Alloy steel

High carbon steel

Low carbon steel

Medium carbon steel

3. 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

4. The steel widely used for motor car crankshafts is

Nickel-chrome steel

Chrome steel

Silicon steel

Nickel steel

5. Following elements have face-centered cubic structure

All of the above

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

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

Mg, Zn, Ti, Zr, Br, Cd

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

(B) Whiteheart cast iron

(A) Blackheart cast iron

(C) Both (A) and (B)

(D) None of these

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

Surface decarburisation

Cold working

Shot peening

Nitriding of surface

8. 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

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

Ductility

Stiffness

Resilience

Plasticity

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

Externally applied forces with breakdown or yielding

Deformation under stress

None of the above

Fracture due to high impact loads

Page 2 of 4

11. Brass is an alloy of

None of these

Copper and tin

Copper and zinc

Copper, tin and zinc

12. Neutral solution is one which has pH value

Less than 7

Greater than 7

pH value has nothing to do with neutral solution

Equal to 7

13. Which is false statement about properties of aluminium?

Wear resistance is very good

Modulus of elasticity is fairly low

Creep strength limits its use to fairly low temperatures

Fatigue strength is not high

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

Increase

Decrease

Remain constant

First increase and then decrease

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

Elevated temperatures

Large surface wear

Light load and pressure

High pressure and load

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

Twenty

Twelve

Six

Eighteen

17. White cast iron has

Low tensile strength

All of these

Carbon in the form of carbide

High compressive strength

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

The grain size increases very rapidly

The grain size first increases and then decreases very rapidly

The average grain size is a minimum

There is no change in grain size

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

Throat

Bosh

Tyres

Stack

20. Balls for ball bearings are made of

Stainless steel

Cast iron

Carbon-chrome steel

Mild steel

Page 3 of 4

21. Foundry crucible is made of

Lead

German silver

Mild steel

Graphite

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

Austenite

Ferrite

Cementite

Pearlite

23. Closed packed hexagonal space lattice is found in

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

Zinc, magnesium, cobalt, cadmium, antimony and bismuth

None of the above

Alpha-iron, tungsten, chromium and molybdenum

24. Delta iron occurs at temperature of

Between 910°C and 1400°C

Between 1400°C and 1539°C

Room temperature

Above melting point

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

None of these

Body centered cubic space lattice

Close packed hexagonal space lattice

Face centered cubic space lattice

26. Recrystallization temperature is one

At which change of allotropic form takes place

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

At which crystals grow bigger in size

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

Hypoeutectic cast irons

None of these

Hypereutectic cast irons

Eutectic cast irons

28. The percentage of carbon in low carbon steel is

0.3%

0.15%

0.5%

0.05%

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

Hot tempering

Creep

Fatigue

Hot hardness

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

Induction hardening

Cyaniding

Nitriding

Electroplating

Page 4 of 4

31. The molecules in a solid move

In a haphazard way

In circular motion

Back and forth like tiny pendulums

In a random manner

32. Malleability of a material can be defined as

Ability to recover its original form

Ability to undergo large permanent deformations in compression

Ability to undergo large permanent deformations in tension

All of the above

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

Normalizing

Annealing

Tempering

Hot working

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

Vitrified clay

Cast iron

Concrete

Asbestos cement

35. 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

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

Phosphor bronze

Babbitt metal

Monel metal

Nichrome

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

Plastic deformation

Creep

Fatigue

Endurance

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

Has a fixed structure under all conditions

Exists in several crystal forms at different temperatures

Has its atoms distributed in a random pattern

Responds to heat treatment

39. The elastic stress strain behavior of rubber is

No fixed relationship

Linear

Plastic

Nonlinear

40. Isotropic materials are those which have the same

Electric and magnetic properties in all directions

Elastic properties in all directions

Stresses induced in all directions

Thermal properties in all directions

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A Demrot is the founder of VideRime Online Learning, a leading engineering website. He did his BE Civil and M.Tech Structure from RGPV University, Bhopal and has been working as an Assistant Professor in a reputed college.

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