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Engineering Materials
0

Engineering Materials Practice Set-5

May 13, 2021

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Page 1 of 4

1. Isotropic materials are those which have the same

Stresses induced in all directions

Thermal properties in all directions

Electric and magnetic properties in all directions

Elastic properties in all directions

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

Has its atoms distributed in a random pattern

Exists in several crystal forms at different temperatures

Has a fixed structure under all conditions

Responds to heat treatment

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

Creep

Hot hardness

Hot tempering

Fatigue

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

Hot working

Tempering

Annealing

Normalizing

5. Which is false statement about properties of aluminium?

Fatigue strength is not high

Wear resistance is very good

Modulus of elasticity is fairly low

Creep strength limits its use to fairly low temperatures

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

Shot peening

Cold working

Nitriding of surface

Surface decarburisation

7. Mild steel belongs to the following category

Low carbon steel

Alloy steel

Medium carbon steel

High carbon steel

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

Nodular cast iron

Malleable cast iron

White cast iron

Alloy cast iron

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

Silicon and manganese has burnt and carbon has started oxidizing

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

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

Air is burning out silicon and manganese

10. 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

Page 2 of 4

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

The average grain size is a minimum

There is no change in grain size

The grain size first increases and then decreases very rapidly

The grain size increases very rapidly

12. Closed packed hexagonal space lattice is found in

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

None of the above

Zinc, magnesium, cobalt, cadmium, antimony and bismuth

Alpha-iron, tungsten, chromium and molybdenum

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

Any one of these

Slowly in the furnace

Suddenly in a suitable cooling medium

In still air

14. Brass is an alloy of

Copper and tin

None of these

Copper, tin and zinc

Copper and zinc

15. Balls for ball bearings are made of

Cast iron

Stainless steel

Mild steel

Carbon-chrome steel

16. Malleability of a material can be defined as

Ability to recover its original form

Ability to undergo large permanent deformations in compression

Ability to undergo large permanent deformations in tension

All of the above

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

Electroplating

Cyaniding

Nitriding

Induction hardening

18. Neutral solution is one which has pH value

Equal to 7

pH value has nothing to do with neutral solution

Less than 7

Greater than 7

19. The steel widely used for motor car crankshafts is

Nickel steel

Nickel-chrome steel

Chrome steel

Silicon steel

20. 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

Page 3 of 4

21. Following elements have face-centered cubic structure

Mg, Zn, Ti, Zr, Br, Cd

All of the above

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

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

Ferrite

Cementite

Pearlite

Austenite

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

Six

Twelve

Eighteen

Twenty

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

Resilience

Ductility

Plasticity

Stiffness

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

Endurance

Fatigue

Plastic deformation

Creep

26. Foundry crucible is made of

German silver

Lead

Mild steel

Graphite

27. White cast iron has

Carbon in the form of carbide

All of these

Low tensile strength

High compressive strength

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

Hypoeutectic cast irons

Eutectic cast irons

None of these

Hypereutectic cast irons

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

Phosphor bronze

Babbitt metal

Nichrome

Monel metal

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

Remain constant

Decrease

First increase and then decrease

Increase

Page 4 of 4

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

Increase endurance strength

Increase wear resistance

Reduce machinability

Increase hardenability

32. The elastic stress strain behavior of rubber is

Linear

Plastic

No fixed relationship

Nonlinear

33. The molecules in a solid move

In circular motion

In a haphazard way

Back and forth like tiny pendulums

In a random manner

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

Cast iron

Concrete

Asbestos cement

Vitrified clay

35. Delta iron occurs at temperature of

Room temperature

Between 1400°C and 1539°C

Above melting point

Between 910°C and 1400°C

36. Recrystallization temperature is one

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

At which new spherical crystals first begin to form from the old deformed one when a strained metal is heated

At which change of allotropic form takes place

At which crystals grow bigger in size

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

Large surface wear

High pressure and load

Elevated temperatures

Light load and pressure

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

Bosh

Tyres

Throat

Stack

39. The percentage of carbon in low carbon steel is

0.5%

0.3%

0.05%

0.15%

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

Body centered cubic space lattice

None of these

Face centered cubic space lattice

Close packed hexagonal space lattice

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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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