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Engineering Materials
0

Engineering Materials Practice Set-5

May 13, 2021

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Page 1 of 4

1. Which is false statement about properties of aluminium?

Modulus of elasticity is fairly low

Wear resistance is very good

Fatigue strength is not high

Creep strength limits its use to fairly low temperatures

2. Mild steel belongs to the following category

High carbon steel

Low carbon steel

Medium carbon steel

Alloy steel

3. 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

In still air

Suddenly in a suitable cooling medium

Slowly in the furnace

4. Malleability of a material can be defined as

Ability to recover its original form

Ability to undergo large permanent deformations in tension

Ability to undergo large permanent deformations in compression

All of the above

5. Delta iron occurs at temperature of

Above melting point

Between 910°C and 1400°C

Between 1400°C and 1539°C

Room temperature

6. Closed packed hexagonal space lattice is found in

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

Alpha-iron, tungsten, chromium and molybdenum

Zinc, magnesium, cobalt, cadmium, antimony and bismuth

None of the above

7. Neutral solution is one which has pH value

Less than 7

Equal to 7

pH value has nothing to do with neutral solution

Greater than 7

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

Monel metal

Babbitt metal

Phosphor bronze

Nichrome

9. Brass is an alloy of

Copper and zinc

Copper, tin and zinc

Copper and tin

None of these

10. 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

Page 2 of 4

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

Throat

Stack

Bosh

Tyres

12. Balls for ball bearings are made of

Carbon-chrome steel

Cast iron

Mild steel

Stainless steel

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

Increase endurance strength

Increase wear resistance

Reduce machinability

Increase hardenability

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

Face centered cubic space lattice

Body centered cubic space lattice

None of these

Close packed hexagonal space lattice

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

(C) Both (A) and (B)

(A) Blackheart cast iron

(B) Whiteheart cast iron

(D) None of these

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

Austenite

Ferrite

Pearlite

Cementite

17. Foundry crucible is made of

Mild steel

German silver

Graphite

Lead

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

Cold working

Shot peening

Surface decarburisation

Nitriding of surface

19. The elastic stress strain behavior of rubber is

Linear

No fixed relationship

Plastic

Nonlinear

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

High pressure and load

Light load and pressure

Large surface wear

Elevated temperatures

Page 3 of 4

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

Cyaniding

Nitriding

Induction hardening

Electroplating

22. 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

Has its atoms distributed in a random pattern

Responds to heat treatment

23. The percentage of carbon in low carbon steel is

0.15%

0.5%

0.05%

0.3%

24. Isotropic materials are those which have the same

Electric and magnetic properties in all directions

Thermal properties in all directions

Elastic properties in all directions

Stresses induced in all directions

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

Fracture due to high impact loads

None of the above

Deformation under stress

Externally applied forces with breakdown or yielding

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

Fatigue

Hot tempering

Creep

Hot hardness

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

Remain constant

First increase and then decrease

Increase

Decrease

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

Six

Twelve

Twenty

Eighteen

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

Annealing

Hot working

Normalizing

Tempering

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

Malleable cast iron

Alloy cast iron

White cast iron

Nodular cast iron

Page 4 of 4

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

Fatigue

Endurance

Creep

Plastic deformation

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

Stiffness

Ductility

Resilience

Plasticity

33. The molecules in a solid move

In circular motion

Back and forth like tiny pendulums

In a haphazard way

In a random manner

34. Recrystallization temperature is one

At which crystals grow bigger in size

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

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

Asbestos cement

Cast iron

Concrete

Vitrified clay

36. 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

Air is burning out silicon and manganese

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

37. The steel widely used for motor car crankshafts is

Silicon steel

Nickel steel

Nickel-chrome steel

Chrome steel

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

There is no change in grain size

The average grain size is a minimum

The grain size first increases and then decreases very rapidly

The grain size increases very rapidly

39. White cast iron has

Carbon in the form of carbide

All of these

Low tensile strength

High compressive strength

40. Following elements have face-centered cubic structure

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

Mg, Zn, Ti, Zr, Br, Cd

All of the above

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

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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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