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Engineering Materials
2

Engineering Materials Practice Set-5

May 13, 2021

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Page 1 of 4

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

(C) Both (A) and (B)

(B) Whiteheart cast iron

(A) Blackheart cast iron

(D) None of these

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

Ductility

Stiffness

Plasticity

Resilience

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

High pressure and load

Light load and pressure

Large surface wear

Elevated temperatures

4. The percentage of carbon in low carbon steel is

0.3%

0.05%

0.5%

0.15%

5. Balls for ball bearings are made of

Stainless steel

Mild steel

Carbon-chrome steel

Cast iron

6. Recrystallization temperature is one

At which change of allotropic form takes place

At which crystals grow bigger in size

At which crystals first start forming from molten metal when it is cooled

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

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

Vitrified clay

Cast iron

Asbestos cement

Concrete

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

Alloy cast iron

Nodular cast iron

Malleable cast iron

White cast iron

9. Following elements have face-centered cubic structure

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

All of the above

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

Nitriding of surface

Cold working

Shot peening

Surface decarburisation

Page 2 of 4

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

The grain size first increases and then decreases very rapidly

The average grain size is a minimum

The grain size increases very rapidly

There is no change in grain size

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

Has a fixed structure under all conditions

Has its atoms distributed in a random pattern

Responds to heat treatment

Exists in several crystal forms at different temperatures

13. Mild steel belongs to the following category

Alloy steel

High carbon steel

Low carbon steel

Medium carbon steel

14. Isotropic materials are those which have the same

Thermal properties in all directions

Elastic properties in all directions

Electric and magnetic properties in all directions

Stresses induced in all directions

15. 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

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

Silicon and manganese has burnt and carbon has started oxidizing

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

17. Malleability of a material can be defined as

Ability to undergo large permanent deformations in compression

All of the above

Ability to undergo large permanent deformations in tension

Ability to recover its original form

18. Foundry crucible is made of

German silver

Mild steel

Lead

Graphite

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

Nichrome

Babbitt metal

Phosphor bronze

Monel metal

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

Increase hardenability

Reduce machinability

Increase endurance strength

Increase wear resistance

Page 3 of 4

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

Stack

Throat

Bosh

Tyres

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

Endurance

Plastic deformation

Creep

Fatigue

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

Hot tempering

Creep

Hot hardness

Fatigue

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

Electroplating

Cyaniding

Nitriding

Induction hardening

25. The steel widely used for motor car crankshafts is

Chrome steel

Nickel steel

Silicon steel

Nickel-chrome steel

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

Fracture due to high impact loads

Externally applied forces with breakdown or yielding

None of the above

Deformation under stress

27. The molecules in a solid move

In a random manner

In circular motion

Back and forth like tiny pendulums

In a haphazard way

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

Pearlite

Cementite

Ferrite

Austenite

29. Which is false statement about properties of aluminium?

Modulus of elasticity is fairly low

Wear resistance is very good

Fatigue strength is not high

Creep strength limits its use to fairly low temperatures

30. 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

Page 4 of 4

31. The elastic stress strain behavior of rubber is

Linear

Plastic

Nonlinear

No fixed relationship

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

Hypereutectic cast irons

Eutectic cast irons

Hypoeutectic cast irons

None of these

33. Neutral solution is one which has pH value

Equal to 7

Greater than 7

Less than 7

pH value has nothing to do with neutral solution

34. 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

35. Delta iron occurs at temperature of

Between 910°C and 1400°C

Room temperature

Above melting point

Between 1400°C and 1539°C

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

Annealing

Normalizing

Hot working

Tempering

37. 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

38. White cast iron has

High compressive strength

Low tensile strength

Carbon in the form of carbide

All of these

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

Twelve

Twenty

Eighteen

Six

40. Brass is an alloy of

Copper and tin

Copper and zinc

Copper, tin and zinc

None of these

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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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