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Engineering Materials
0

Engineering Materials Practice Set-5

May 13, 2021

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Page 1 of 4

1. Malleability of a material can be defined as

All of the above

Ability to undergo large permanent deformations in compression

Ability to undergo large permanent deformations in tension

Ability to recover its original form

2. 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

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

Nodular cast iron

Alloy cast iron

Malleable cast iron

White cast iron

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

Electroplating

Cyaniding

Induction hardening

Nitriding

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

Annealing

Hot working

Tempering

Normalizing

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

Remain constant

First increase and then decrease

Decrease

Increase

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

Throat

Bosh

Tyres

Stack

8. Foundry crucible is made of

Mild steel

German silver

Graphite

Lead

9. The percentage of carbon in low carbon steel is

0.5%

0.15%

0.3%

0.05%

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

Stiffness

Ductility

Plasticity

Resilience

Page 2 of 4

11. Mild steel belongs to the following category

Alloy steel

High carbon steel

Low carbon steel

Medium carbon steel

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

Elevated temperatures

Light load and pressure

Large surface wear

High pressure and load

13. Recrystallization temperature is one

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

At which change of allotropic form takes place

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

The grain size first increases and then decreases very rapidly

There is no change in grain size

The grain size increases very rapidly

The average grain size is a minimum

15. Neutral solution is one which has pH value

Greater than 7

Less than 7

pH value has nothing to do with neutral solution

Equal to 7

16. 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

17. 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

18. Isotropic materials are those which have the same

Elastic properties in all directions

Thermal properties in all directions

Electric and magnetic properties in all directions

Stresses induced in all directions

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

Babbitt metal

Monel metal

Nichrome

Phosphor bronze

20. 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

Page 3 of 4

21. 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

22. The steel widely used for motor car crankshafts is

Nickel-chrome steel

Silicon steel

Chrome steel

Nickel steel

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

Surface decarburisation

Shot peening

Cold working

Nitriding of surface

24. Delta iron occurs at temperature of

Room temperature

Between 910°C and 1400°C

Above melting point

Between 1400°C and 1539°C

25. Following elements have face-centered cubic structure

Mg, Zn, Ti, Zr, Br, Cd

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

All of the above

26. Balls for ball bearings are made of

Mild steel

Carbon-chrome steel

Cast iron

Stainless steel

27. The elastic stress strain behavior of rubber is

Plastic

Nonlinear

Linear

No fixed relationship

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

Air is burning out silicon and manganese

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

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

Creep

Plastic deformation

Fatigue

Endurance

30. The molecules in a solid move

In a haphazard way

Back and forth like tiny pendulums

In circular motion

In a random manner

Page 4 of 4

31. White cast iron has

Low tensile strength

High compressive strength

All of these

Carbon in the form of carbide

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

Increase wear resistance

Increase hardenability

Reduce machinability

Increase endurance strength

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

Six

Twelve

Twenty

Eighteen

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

Asbestos cement

Cast iron

Concrete

Vitrified clay

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

None of the above

Deformation under stress

Fracture due to high impact loads

Externally applied forces with breakdown or yielding

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

Responds to heat treatment

Has its atoms distributed in a random pattern

Exists in several crystal forms at different temperatures

Has a fixed structure under all conditions

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

None of these

Hypereutectic cast irons

Eutectic cast irons

Hypoeutectic cast irons

38. Brass is an alloy of

None of these

Copper and zinc

Copper and tin

Copper, tin and zinc

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

Hot tempering

Creep

Fatigue

Hot hardness

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

Austenite

Cementite

Ferrite

Pearlite

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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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