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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

Any one of these

In still air

Suddenly in a suitable cooling medium

Slowly in the furnace

2. 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 average grain size is a minimum

The grain size first increases and then decreases very rapidly

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

Has its atoms distributed in a random pattern

Has a fixed structure under all conditions

Responds to heat treatment

Exists in several crystal forms at different temperatures

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

Bosh

Throat

Tyres

Stack

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

First increase and then decrease

Remain constant

Decrease

Increase

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

Cementite

Pearlite

Austenite

Ferrite

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

Malleable cast iron

White cast iron

Nodular cast iron

Alloy cast iron

8. Delta iron occurs at temperature of

Between 910°C and 1400°C

Room temperature

Between 1400°C and 1539°C

Above melting point

9. Mild steel belongs to the following category

Medium carbon steel

High carbon steel

Low carbon steel

Alloy steel

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

Tempering

Annealing

Hot working

Normalizing

Page 2 of 4

11. 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

12. The molecules in a solid move

Back and forth like tiny pendulums

In a haphazard way

In a random manner

In circular motion

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

Fracture due to high impact loads

Externally applied forces with breakdown or yielding

None of the above

Deformation under stress

14. The steel widely used for motor car crankshafts is

Silicon steel

Nickel-chrome steel

Chrome steel

Nickel steel

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

Cyaniding

Nitriding

Induction hardening

Electroplating

16. 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)

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

Monel metal

Phosphor bronze

Nichrome

Babbitt metal

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

Large surface wear

Elevated temperatures

Light load and pressure

High pressure and load

19. 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

20. Foundry crucible is made of

Graphite

Mild steel

German silver

Lead

Page 3 of 4

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

Fatigue

Hot tempering

Hot hardness

Creep

22. White cast iron has

Carbon in the form of carbide

All of these

Low tensile strength

High compressive strength

23. Closed packed hexagonal space lattice is found in

None of the above

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

Alpha-iron, tungsten, chromium and molybdenum

Zinc, magnesium, cobalt, cadmium, antimony and bismuth

24. 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

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

Asbestos cement

Vitrified clay

Concrete

Cast iron

26. Which is false statement about properties of aluminium?

Modulus of elasticity is fairly low

Wear resistance is very good

Creep strength limits its use to fairly low temperatures

Fatigue strength is not high

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

Increase wear resistance

Increase endurance strength

Reduce machinability

Increase hardenability

28. Malleability of a material can be defined as

Ability to undergo large permanent deformations in compression

Ability to undergo large permanent deformations in tension

All of the above

Ability to recover its original form

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

Fatigue

Endurance

Plastic deformation

Creep

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

Hypoeutectic cast irons

None of these

Eutectic cast irons

Hypereutectic cast irons

Page 4 of 4

31. Neutral solution is one which has pH value

Equal to 7

pH value has nothing to do with neutral solution

Less than 7

Greater than 7

32. Balls for ball bearings are made of

Cast iron

Stainless steel

Mild steel

Carbon-chrome steel

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

Eighteen

Six

Twenty

Twelve

34. The elastic stress strain behavior of rubber is

Plastic

No fixed relationship

Nonlinear

Linear

35. Isotropic materials are those which have the same

Thermal properties in all directions

Electric and magnetic properties in all directions

Stresses induced in all directions

Elastic properties in all directions

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

Plasticity

Ductility

Resilience

Stiffness

37. The percentage of carbon in low carbon steel is

0.5%

0.3%

0.05%

0.15%

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

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

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

39. Brass is an alloy of

Copper and tin

Copper, tin and zinc

None of these

Copper and zinc

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

Surface decarburisation

Nitriding of surface

Cold working

Shot peening

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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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