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Engineering Materials
0

Engineering Materials Practice Set-5

May 13, 2021

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Page 1 of 4

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

Six

Eighteen

Twelve

Twenty

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

Stiffness

Plasticity

Ductility

Resilience

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

Shot peening

Nitriding of surface

Surface decarburisation

Cold working

4. Balls for ball bearings are made of

Stainless steel

Cast iron

Carbon-chrome steel

Mild steel

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

Reduce machinability

Increase endurance strength

Increase hardenability

Increase wear resistance

6. The elastic stress strain behavior of rubber is

Nonlinear

Plastic

No fixed relationship

Linear

7. 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

8. Mild steel belongs to the following category

Alloy steel

Medium carbon steel

High carbon steel

Low carbon steel

9. 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

10. 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

In still air

Any one of these

Page 2 of 4

11. Delta iron occurs at temperature of

Above melting point

Between 910°C and 1400°C

Room temperature

Between 1400°C and 1539°C

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

Cast iron

Concrete

Vitrified clay

Asbestos cement

13. The percentage of carbon in low carbon steel is

0.3%

0.05%

0.5%

0.15%

14. 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

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

White cast iron

Nodular cast iron

Alloy cast iron

Malleable cast iron

16. Following elements have face-centered cubic structure

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

All of the above

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

Electroplating

Induction hardening

Nitriding

Cyaniding

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

(B) Whiteheart cast iron

(D) None of these

(C) Both (A) and (B)

(A) Blackheart cast iron

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

Throat

Bosh

Tyres

Stack

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

Hypereutectic cast irons

None of these

Eutectic cast irons

Hypoeutectic cast irons

Page 3 of 4

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

Hot hardness

Creep

Fatigue

Hot tempering

22. Which is false statement about properties of aluminium?

Creep strength limits its use to fairly low temperatures

Modulus of elasticity is fairly low

Wear resistance is very good

Fatigue strength is not high

23. White cast iron has

Carbon in the form of carbide

High compressive strength

All of these

Low tensile strength

24. Recrystallization temperature is one

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

At which crystals grow bigger in size

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

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

Ferrite

Austenite

Cementite

Pearlite

26. Isotropic materials are those which have the same

Elastic properties in all directions

Stresses induced in all directions

Thermal properties in all directions

Electric and magnetic properties in all directions

27. Neutral solution is one which has pH value

Less than 7

pH value has nothing to do with neutral solution

Greater than 7

Equal to 7

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

Phosphor bronze

Monel metal

Babbitt metal

Nichrome

29. 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

Silicon and manganese has burnt and carbon has started oxidizing

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

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

Light load and pressure

High pressure and load

Elevated temperatures

Large surface wear

Page 4 of 4

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

Exists in several crystal forms at different temperatures

Has its atoms distributed in a random pattern

Has a fixed structure under all conditions

Responds to heat treatment

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

First increase and then decrease

Increase

Decrease

Remain constant

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

Annealing

Hot working

Tempering

Normalizing

34. Closed packed hexagonal space lattice is found in

None of the above

Zinc, magnesium, cobalt, cadmium, antimony and bismuth

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

Alpha-iron, tungsten, chromium and molybdenum

35. Foundry crucible is made of

Lead

Graphite

German silver

Mild steel

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

The grain size increases very rapidly

The average grain size is a minimum

There is no change in grain size

The grain size first increases and then decreases very rapidly

37. Brass is an alloy of

Copper and tin

None of these

Copper and zinc

Copper, tin and zinc

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

Plastic deformation

Creep

Fatigue

Endurance

39. The molecules in a solid move

In a haphazard way

In a random manner

In circular motion

Back and forth like tiny pendulums

40. The steel widely used for motor car crankshafts is

Nickel-chrome steel

Chrome steel

Silicon steel

Nickel steel

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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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