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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 percentage of carbon in low carbon steel is

0.15%

0.5%

0.05%

0.3%

2. Isotropic materials are those which have the same

Elastic properties in all directions

Electric and magnetic properties in all directions

Thermal properties in all directions

Stresses induced in all directions

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

Endurance

Creep

Fatigue

Plastic deformation

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

Annealing

Tempering

Hot working

Normalizing

5. 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

6. Brass is an alloy of

Copper and zinc

Copper and tin

None of these

Copper, tin and zinc

7. 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

8. 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

Any one of these

In still air

Suddenly in a suitable cooling medium

9. 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

10. Recrystallization temperature is one

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

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

Page 2 of 4

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

Deformation under stress

Externally applied forces with breakdown or yielding

Fracture due to high impact loads

None of the above

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

Eighteen

Twenty

Twelve

Six

13. 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

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

All of the above

14. Delta iron occurs at temperature of

Between 1400°C and 1539°C

Between 910°C and 1400°C

Room temperature

Above melting point

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

Pearlite

Cementite

Ferrite

Austenite

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

Throat

Bosh

Stack

Tyres

17. Foundry crucible is made of

Graphite

Mild steel

Lead

German silver

18. Balls for ball bearings are made of

Mild steel

Stainless steel

Cast iron

Carbon-chrome steel

19. The elastic stress strain behavior of rubber is

No fixed relationship

Linear

Nonlinear

Plastic

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

Ductility

Plasticity

Stiffness

Resilience

Page 3 of 4

21. 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

22. White cast iron has

All of these

High compressive strength

Low tensile strength

Carbon in the form of carbide

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

Shot peening

Surface decarburisation

Cold working

Nitriding of surface

24. The steel widely used for motor car crankshafts is

Silicon steel

Chrome steel

Nickel-chrome steel

Nickel steel

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

Alloy cast iron

Nodular cast iron

Malleable cast iron

White cast iron

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

Cast iron

Asbestos cement

Concrete

Vitrified clay

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

First increase and then decrease

Decrease

Increase

Remain constant

28. Mild steel belongs to the following category

Alloy steel

High carbon steel

Low carbon steel

Medium carbon steel

29. The molecules in a solid move

In a random manner

In a haphazard way

In circular motion

Back and forth like tiny pendulums

30. Malleability of a material can be defined as

Ability to recover its original form

Ability to undergo large permanent deformations in compression

All of the above

Ability to undergo large permanent deformations in tension

Page 4 of 4

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

Cyaniding

Induction hardening

Electroplating

Nitriding

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

Eutectic cast irons

Hypoeutectic cast irons

None of these

Hypereutectic cast irons

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

Increase endurance strength

Reduce machinability

Increase wear resistance

Increase hardenability

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

Exists in several crystal forms at different temperatures

Responds to heat treatment

Has a fixed structure under all conditions

Has its atoms distributed in a random pattern

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

Babbitt metal

Nichrome

Monel metal

Phosphor bronze

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

Close packed hexagonal space lattice

None of these

Face centered cubic space lattice

Body centered cubic space lattice

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

High pressure and load

Large surface wear

Elevated temperatures

Light load and pressure

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

Creep

Fatigue

Hot hardness

Hot tempering

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

There is no change in grain size

The grain size increases very rapidly

The average grain size is a minimum

The grain size first increases and then decreases very rapidly

40. Neutral solution is one which has pH value

Less than 7

Greater than 7

pH value has nothing to do with neutral solution

Equal to 7

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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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