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Engineering Materials
3

Engineering Materials Practice Set-5

May 13, 2021

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Page 1 of 4

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

Body centered cubic space lattice

None of these

Close packed hexagonal space lattice

Face centered cubic space lattice

2. 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

Suddenly in a suitable cooling medium

Any one of these

In still air

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

Stiffness

Resilience

Plasticity

Ductility

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

Nodular cast iron

Alloy cast iron

White cast iron

Malleable cast iron

5. Balls for ball bearings are made of

Carbon-chrome steel

Cast iron

Stainless steel

Mild steel

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

Increase hardenability

Increase endurance strength

Reduce machinability

Increase wear resistance

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

Eighteen

Twenty

Six

Twelve

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

Vitrified clay

Concrete

Cast iron

Asbestos cement

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

Tempering

Annealing

Hot working

Normalizing

10. Delta iron occurs at temperature of

Room temperature

Between 910°C and 1400°C

Between 1400°C and 1539°C

Above melting point

Page 2 of 4

11. 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

Silicon and manganese has burnt and carbon has started oxidizing

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

12. Which is false statement about properties of aluminium?

Wear resistance is very good

Creep strength limits its use to fairly low temperatures

Fatigue strength is not high

Modulus of elasticity is fairly low

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

Responds to heat treatment

Has its atoms distributed in a random pattern

Has a fixed structure under all conditions

Exists in several crystal forms at different temperatures

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

The average grain size is a minimum

The grain size increases very rapidly

There is no change in grain size

The grain size first increases and then decreases very rapidly

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

Stack

Tyres

Bosh

Throat

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

Cold working

Surface decarburisation

Nitriding of surface

Shot peening

17. Brass is an alloy of

None of these

Copper and zinc

Copper and tin

Copper, tin and zinc

18. The percentage of carbon in low carbon steel is

0.05%

0.15%

0.5%

0.3%

19. 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

20. The elastic stress strain behavior of rubber is

Plastic

Nonlinear

Linear

No fixed relationship

Page 3 of 4

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

(D) None of these

(B) Whiteheart cast iron

(C) Both (A) and (B)

(A) Blackheart cast iron

22. 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

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

Fatigue

Creep

Endurance

Plastic deformation

24. Closed packed hexagonal space lattice is found in

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

Zinc, magnesium, cobalt, cadmium, antimony and bismuth

Alpha-iron, tungsten, chromium and molybdenum

None of the above

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

Pearlite

Ferrite

Cementite

Austenite

26. The molecules in a solid move

In circular motion

In a haphazard way

In a random manner

Back and forth like tiny pendulums

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

Nitriding

Electroplating

Cyaniding

Induction hardening

28. Isotropic materials are those which have the same

Electric and magnetic properties in all directions

Thermal properties in all directions

Stresses induced in all directions

Elastic properties in all directions

29. Following elements have face-centered cubic structure

Mg, Zn, Ti, Zr, Br, Cd

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

30. White cast iron has

Low tensile strength

Carbon in the form of carbide

All of these

High compressive strength

Page 4 of 4

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

Hot tempering

Hot hardness

Fatigue

Creep

32. Recrystallization temperature is one

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

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

At which change of allotropic form takes place

33. 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

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

Large surface wear

Light load and pressure

Elevated temperatures

High pressure and load

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

None of the above

Deformation under stress

Externally applied forces with breakdown or yielding

Fracture due to high impact loads

36. Mild steel belongs to the following category

High carbon steel

Medium carbon steel

Alloy steel

Low carbon steel

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

Remain constant

Decrease

Increase

First increase and then decrease

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

Monel metal

Nichrome

Phosphor bronze

Babbitt metal

39. Foundry crucible is made of

Graphite

German silver

Mild steel

Lead

40. The steel widely used for motor car crankshafts is

Nickel-chrome steel

Silicon steel

Nickel steel

Chrome steel

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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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