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Engineering Materials
3

Engineering Materials Practice Set-5

May 13, 2021

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Page 1 of 4

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

Pearlite

Austenite

Cementite

Ferrite

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

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

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

3. Balls for ball bearings are made of

Mild steel

Carbon-chrome steel

Stainless steel

Cast iron

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

Cold working

Shot peening

Nitriding of surface

Surface decarburisation

5. 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

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

Slowly in the furnace

In still air

Any one of these

Suddenly in a suitable cooling medium

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

Creep

Plastic deformation

Fatigue

Endurance

8. Malleability of a material can be defined as

Ability to undergo large permanent deformations in tension

Ability to undergo large permanent deformations in compression

All of the above

Ability to recover its original form

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

Hot working

Normalizing

Annealing

Tempering

10. Isotropic materials are those which have the same

Thermal properties in all directions

Elastic properties in all directions

Stresses induced in all directions

Electric and magnetic properties in all directions

Page 2 of 4

11. The molecules in a solid move

Back and forth like tiny pendulums

In a haphazard way

In a random manner

In circular motion

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

Asbestos cement

Cast iron

Vitrified clay

Concrete

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

Hot hardness

Creep

Fatigue

Hot tempering

14. The elastic stress strain behavior of rubber is

Nonlinear

Plastic

Linear

No fixed relationship

15. The steel widely used for motor car crankshafts is

Nickel steel

Nickel-chrome steel

Silicon steel

Chrome steel

16. 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

17. Neutral solution is one which has pH value

Greater than 7

pH value has nothing to do with neutral solution

Equal to 7

Less than 7

18. Mild steel belongs to the following category

Low carbon steel

High carbon steel

Alloy steel

Medium carbon steel

19. Closed packed hexagonal space lattice is found in

Alpha-iron, tungsten, chromium and molybdenum

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

Zinc, magnesium, cobalt, cadmium, antimony and bismuth

None of the above

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

None of these

Hypoeutectic cast irons

Eutectic cast irons

Hypereutectic cast irons

Page 3 of 4

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

Increase endurance strength

Reduce machinability

Increase hardenability

Increase wear resistance

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

Electroplating

Cyaniding

Induction hardening

Nitriding

23. 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

24. Following elements have face-centered cubic structure

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

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

Mg, Zn, Ti, Zr, Br, Cd

All of the above

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

Twenty

Eighteen

Twelve

Six

26. The percentage of carbon in low carbon steel is

0.05%

0.5%

0.15%

0.3%

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

Deformation under stress

Externally applied forces with breakdown or yielding

None of the above

Fracture due to high impact loads

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

(A) Blackheart cast iron

(D) None of these

(C) Both (A) and (B)

(B) Whiteheart cast iron

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

Alloy cast iron

White cast iron

Nodular cast iron

Malleable cast iron

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

First increase and then decrease

Decrease

Increase

Remain constant

Page 4 of 4

31. Brass is an alloy of

Copper and tin

Copper, tin and zinc

Copper and zinc

None of these

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

Stiffness

Resilience

Plasticity

Ductility

33. Which is false statement about properties of aluminium?

Creep strength limits its use to fairly low temperatures

Fatigue strength is not high

Modulus of elasticity is fairly low

Wear resistance is very good

34. 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

35. Foundry crucible is made of

Mild steel

Lead

German silver

Graphite

36. 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

Exists in several crystal forms at different temperatures

Responds to heat treatment

37. Recrystallization temperature is one

At which crystals grow bigger in size

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

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

38. Delta iron occurs at temperature of

Above melting point

Between 1400°C and 1539°C

Between 910°C and 1400°C

Room temperature

39. White cast iron has

All of these

Low tensile strength

High compressive strength

Carbon in the form of carbide

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

Throat

Bosh

Tyres

Stack

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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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