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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?

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

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

Nitriding of surface

Shot peening

Cold working

Surface decarburisation

3. 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

All of the above

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

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

Hot tempering

Creep

Fatigue

Hot hardness

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

Plastic deformation

Creep

Fatigue

Endurance

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

Vitrified clay

Asbestos cement

Concrete

Cast iron

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

Elevated temperatures

Large surface wear

Light load and pressure

High pressure and load

8. The steel widely used for motor car crankshafts is

Silicon steel

Nickel-chrome steel

Chrome steel

Nickel steel

9. Balls for ball bearings are made of

Mild steel

Carbon-chrome steel

Stainless steel

Cast iron

10. The elastic stress strain behavior of rubber is

No fixed relationship

Nonlinear

Plastic

Linear

Page 2 of 4

11. 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

12. White cast iron has

Low tensile strength

All of these

Carbon in the form of carbide

High compressive strength

13. Malleability of a material can be defined as

Ability to undergo large permanent deformations in compression

Ability to recover its original form

All of the above

Ability to undergo large permanent deformations in tension

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

Hot working

Annealing

Normalizing

Tempering

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

(D) None of these

(C) Both (A) and (B)

(A) Blackheart cast iron

(B) Whiteheart cast iron

16. Recrystallization temperature is one

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

At which change of allotropic form takes place

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

17. Neutral solution is one which has pH value

Equal to 7

pH value has nothing to do with neutral solution

Greater than 7

Less than 7

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

Silicon and manganese has burnt and carbon has started oxidizing

Air is burning out silicon and manganese

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

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

Ferrite

Cementite

Austenite

Pearlite

20. Isotropic materials are those which have the same

Thermal properties in all directions

Elastic properties in all directions

Stresses induced in all directions

Electric and magnetic properties in all directions

Page 3 of 4

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

Hypoeutectic cast irons

Eutectic cast irons

Hypereutectic cast irons

None of these

22. 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 increases very rapidly

The grain size first increases and then decreases very rapidly

23. The molecules in a solid move

Back and forth like tiny pendulums

In a random manner

In circular motion

In a haphazard way

24. Mild steel belongs to the following category

Medium carbon steel

Low carbon steel

Alloy steel

High carbon steel

25. The percentage of carbon in low carbon steel is

0.5%

0.3%

0.15%

0.05%

26. 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

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

Suddenly in a suitable cooling medium

In still air

Any one of these

Slowly in the furnace

28. Closed packed hexagonal space lattice is found in

Zinc, magnesium, cobalt, cadmium, antimony and bismuth

None of the above

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

Alpha-iron, tungsten, chromium and molybdenum

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

Twelve

Eighteen

Six

Twenty

30. Brass is an alloy of

None of these

Copper and tin

Copper and zinc

Copper, tin and zinc

Page 4 of 4

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

Electroplating

Nitriding

Cyaniding

Induction hardening

32. Delta iron occurs at temperature of

Between 910°C and 1400°C

Room temperature

Above melting point

Between 1400°C and 1539°C

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

Close packed hexagonal space lattice

Body centered cubic space lattice

Face centered cubic space lattice

None of these

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

Increase wear resistance

Increase endurance strength

Increase hardenability

Reduce machinability

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

Has a fixed structure under all conditions

Exists in several crystal forms at different temperatures

Responds to heat treatment

Has its atoms distributed in a random pattern

36. Foundry crucible is made of

Mild steel

Lead

German silver

Graphite

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

Ductility

Stiffness

Resilience

Plasticity

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

Externally applied forces with breakdown or yielding

Deformation under stress

None of the above

Fracture due to high impact loads

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

Stack

Bosh

Throat

Tyres

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

Phosphor bronze

Nichrome

Babbitt metal

Monel metal

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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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