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Engineering Materials
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Engineering Materials Practice Set-5

May 13, 2021

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Page 1 of 4

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

In still air

Any one of these

Suddenly in a suitable cooling medium

Slowly in the furnace

2. The elastic stress strain behavior of rubber is

No fixed relationship

Plastic

Nonlinear

Linear

3. Foundry crucible is made of

Lead

Mild steel

German silver

Graphite

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

Induction hardening

Cyaniding

Nitriding

Electroplating

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

Plasticity

Resilience

Ductility

Stiffness

6. 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

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

Air is burning out silicon and manganese

Silicon and manganese has burnt and carbon has started oxidizing

7. Malleability of a material can be defined as

Ability to undergo large permanent deformations in tension

Ability to recover its original form

Ability to undergo large permanent deformations in compression

All of the above

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

Fatigue

Creep

Hot tempering

Hot hardness

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

Cementite

Pearlite

Ferrite

Austenite

10. 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

Page 2 of 4

11. 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

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

Hypereutectic cast irons

Hypoeutectic cast irons

None of these

Eutectic cast irons

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

Nitriding of surface

Surface decarburisation

Cold working

Shot peening

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

Twenty

Eighteen

Twelve

Six

15. Brass is an alloy of

Copper, tin and zinc

Copper and zinc

Copper and tin

None of these

16. Neutral solution is one which has pH value

pH value has nothing to do with neutral solution

Greater than 7

Equal to 7

Less than 7

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

(D) None of these

(A) Blackheart cast iron

(B) Whiteheart cast iron

(C) Both (A) and (B)

18. Closed packed hexagonal space lattice is found in

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

Zinc, magnesium, cobalt, cadmium, antimony and bismuth

None of the above

Alpha-iron, tungsten, chromium and molybdenum

19. Balls for ball bearings are made of

Stainless steel

Cast iron

Carbon-chrome steel

Mild steel

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

Normalizing

Tempering

Hot working

Annealing

Page 3 of 4

21. 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

22. The steel widely used for motor car crankshafts is

Nickel-chrome steel

Chrome steel

Nickel steel

Silicon steel

23. Mild steel belongs to the following category

Alloy steel

Medium carbon steel

High carbon steel

Low carbon steel

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

Fatigue

Plastic deformation

Endurance

Creep

25. Isotropic materials are those which have the same

Thermal properties in all directions

Electric and magnetic properties in all directions

Elastic properties in all directions

Stresses induced in all directions

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

Reduce machinability

Increase wear resistance

Increase hardenability

Increase endurance strength

27. The percentage of carbon in low carbon steel is

0.3%

0.05%

0.5%

0.15%

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

Cast iron

Vitrified clay

Concrete

Asbestos cement

29. 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

30. 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

Page 4 of 4

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

None of the above

Fracture due to high impact loads

Externally applied forces with breakdown or yielding

Deformation under stress

32. White cast iron has

Low tensile strength

Carbon in the form of carbide

All of these

High compressive strength

33. Recrystallization temperature is one

At which crystals grow bigger in size

At which change of allotropic form takes place

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

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

34. 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

35. The molecules in a solid move

In a random manner

In circular motion

Back and forth like tiny pendulums

In a haphazard way

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

Bosh

Tyres

Stack

Throat

37. 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

38. Delta iron occurs at temperature of

Room temperature

Between 1400°C and 1539°C

Above melting point

Between 910°C and 1400°C

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

Remain constant

First increase and then decrease

Decrease

Increase

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

The grain size increases very rapidly

There is no change in grain size

The grain size first increases and then decreases very rapidly

The average grain size is a minimum

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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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