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Engineering Materials
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Engineering Materials Practice Set-5

May 13, 2021

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Page 1 of 4

1. The steel widely used for motor car crankshafts is

Nickel-chrome steel

Chrome steel

Nickel steel

Silicon steel

2. 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

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

Electroplating

Nitriding

Cyaniding

Induction hardening

4. Following elements have face-centered cubic structure

All of the above

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

Mg, Zn, Ti, Zr, Br, Cd

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

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

There is no change in grain size

The grain size increases very rapidly

The grain size first increases and then decreases very rapidly

The average grain size is a minimum

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

Suddenly in a suitable cooling medium

Any one of these

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

Vitrified clay

Concrete

Asbestos cement

Cast iron

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

Eighteen

Twenty

Six

Twelve

9. The elastic stress strain behavior of rubber is

Plastic

Linear

Nonlinear

No fixed relationship

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

Fatigue

Hot tempering

Hot hardness

Creep

Page 2 of 4

11. Mild steel belongs to the following category

High carbon steel

Alloy steel

Low carbon steel

Medium carbon steel

12. Which is false statement about properties of aluminium?

Creep strength limits its use to fairly low temperatures

Wear resistance is very good

Modulus of elasticity is fairly low

Fatigue strength is not high

13. Neutral solution is one which has pH value

Less than 7

Greater than 7

Equal to 7

pH value has nothing to do with neutral solution

14. The molecules in a solid move

In circular motion

Back and forth like tiny pendulums

In a random manner

In a haphazard way

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

Nodular cast iron

White cast iron

Alloy cast iron

Malleable cast iron

16. White cast iron has

High compressive strength

All of these

Low tensile strength

Carbon in the form of carbide

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

High pressure and load

Large surface wear

Light load and pressure

Elevated temperatures

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

Exists in several crystal forms at different temperatures

Has a fixed structure under all conditions

Responds to heat treatment

Has its atoms distributed in a random pattern

19. Brass is an alloy of

Copper and zinc

None of these

Copper and tin

Copper, tin and zinc

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

Bosh

Throat

Tyres

Stack

Page 3 of 4

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

Normalizing

Annealing

Tempering

Hot working

22. Balls for ball bearings are made of

Mild steel

Carbon-chrome steel

Stainless steel

Cast iron

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

(D) None of these

(B) Whiteheart cast iron

(A) Blackheart cast iron

(C) Both (A) and (B)

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

Externally applied forces with breakdown or yielding

Fracture due to high impact loads

None of the above

Deformation under stress

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

Body centered cubic space lattice

Face centered cubic space lattice

Close packed hexagonal space lattice

None of these

26. The percentage of carbon in low carbon steel is

0.05%

0.3%

0.5%

0.15%

27. Delta iron occurs at temperature of

Between 910°C and 1400°C

Between 1400°C and 1539°C

Room temperature

Above melting point

28. 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

29. Closed packed hexagonal space lattice is found in

Alpha-iron, tungsten, chromium and molybdenum

Zinc, magnesium, cobalt, cadmium, antimony and bismuth

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

None of the above

30. 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

Page 4 of 4

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

Stiffness

Plasticity

Resilience

Ductility

32. Malleability of a material can be defined as

Ability to recover its original form

Ability to undergo large permanent deformations in compression

All of the above

Ability to undergo large permanent deformations in tension

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

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

The converter must be titled to remove the contents of the converter

Silicon and manganese has burnt and carbon has started oxidizing

Air is burning out silicon and manganese

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

Babbitt metal

Phosphor bronze

Monel metal

Nichrome

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

Reduce machinability

Increase hardenability

Increase wear resistance

Increase endurance strength

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

Creep

Fatigue

Endurance

Plastic deformation

37. Foundry crucible is made of

German silver

Lead

Mild steel

Graphite

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

Shot peening

Surface decarburisation

Nitriding of surface

Cold working

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

None of these

Hypoeutectic cast irons

Hypereutectic cast irons

Eutectic cast irons

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

Cementite

Pearlite

Ferrite

Austenite

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VideRime

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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