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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?

Fatigue strength is not high

Creep strength limits its use to fairly low temperatures

Modulus of elasticity is fairly low

Wear resistance is very good

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

High pressure and load

Light load and pressure

Elevated temperatures

Large surface wear

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

Hot working

Normalizing

Tempering

Annealing

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

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

Air is burning out silicon and manganese

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

Silicon and manganese has burnt and carbon has started oxidizing

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

Monel metal

Babbitt metal

Nichrome

Phosphor bronze

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

Vitrified clay

Concrete

Asbestos cement

Cast iron

7. Foundry crucible is made of

Mild steel

German silver

Lead

Graphite

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

Creep

Plastic deformation

Endurance

Fatigue

9. Malleability of a material can be defined as

Ability to undergo large permanent deformations in tension

All of the above

Ability to recover its original form

Ability to undergo large permanent deformations in compression

10. Neutral solution is one which has pH value

Greater than 7

Equal to 7

pH value has nothing to do with neutral solution

Less than 7

Page 2 of 4

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

(B) Whiteheart cast iron

(D) None of these

(A) Blackheart cast iron

(C) Both (A) and (B)

12. The percentage of carbon in low carbon steel is

0.5%

0.15%

0.05%

0.3%

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

Decrease

Remain constant

Increase

First increase and then decrease

14. Balls for ball bearings are made of

Cast iron

Mild steel

Stainless steel

Carbon-chrome steel

15. Recrystallization temperature is one

At which crystals grow bigger in size

At which change of allotropic form takes place

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

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

Stack

Bosh

Throat

Tyres

17. Isotropic materials are those which have the same

Electric and magnetic properties in all directions

Elastic properties in all directions

Thermal properties in all directions

Stresses induced in all directions

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

Alloy cast iron

Malleable cast iron

White cast iron

Nodular cast iron

19. White cast iron has

Low tensile strength

High compressive strength

Carbon in the form of carbide

All of these

20. The molecules in a solid move

In circular motion

In a random manner

In a haphazard way

Back and forth like tiny pendulums

Page 3 of 4

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

Twenty

Six

Eighteen

Twelve

22. The elastic stress strain behavior of rubber is

No fixed relationship

Linear

Nonlinear

Plastic

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

Hypereutectic cast irons

Eutectic cast irons

None of these

Hypoeutectic cast irons

24. Mild steel belongs to the following category

Medium carbon steel

Low carbon steel

Alloy steel

High carbon steel

25. Closed packed hexagonal space lattice is found in

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

None of the above

Alpha-iron, tungsten, chromium and molybdenum

Zinc, magnesium, cobalt, cadmium, antimony and bismuth

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

Nitriding

Induction hardening

Cyaniding

Electroplating

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

Fracture due to high impact loads

Externally applied forces with breakdown or yielding

Deformation under stress

None of the above

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

Ductility

Plasticity

Resilience

Stiffness

29. The steel widely used for motor car crankshafts is

Nickel-chrome steel

Silicon steel

Chrome steel

Nickel steel

30. 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

Page 4 of 4

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

Fatigue

Hot tempering

Creep

Hot hardness

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

Increase endurance strength

Reduce machinability

Increase wear resistance

Increase hardenability

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

None of these

Close packed hexagonal space lattice

Body centered cubic space lattice

Face centered cubic space lattice

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

Cold working

Shot peening

Nitriding of surface

Surface decarburisation

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

The average grain size is a minimum

The grain size first increases and then decreases very rapidly

There is no change in grain size

The grain size increases very rapidly

37. Brass is an alloy of

None of these

Copper, tin and zinc

Copper and tin

Copper and zinc

38. 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

Any one of these

In still air

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

Pearlite

Cementite

Ferrite

Austenite

40. Following elements have face-centered cubic structure

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

Mg, Zn, Ti, Zr, Br, Cd

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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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