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

Light load and pressure

Elevated temperatures

Large surface wear

High pressure and load

2. The steel widely used for motor car crankshafts is

Silicon steel

Chrome steel

Nickel steel

Nickel-chrome steel

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

Throat

Stack

Tyres

Bosh

4. Following elements have face-centered cubic structure

All of the above

Mg, Zn, Ti, Zr, Br, Cd

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

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

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

Cementite

Ferrite

Austenite

Pearlite

6. The molecules in a solid move

In a random manner

In a haphazard way

Back and forth like tiny pendulums

In circular motion

7. Foundry crucible is made of

Mild steel

Lead

German silver

Graphite

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

Electroplating

Induction hardening

Nitriding

Cyaniding

9. 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

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

Close packed hexagonal space lattice

Face centered cubic space lattice

Body centered cubic space lattice

None of these

Page 2 of 4

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

Creep

Hot hardness

Hot tempering

Fatigue

12. 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

Responds to heat treatment

Has its atoms distributed in a random pattern

13. Brass is an alloy of

Copper and zinc

Copper and tin

None of these

Copper, tin and zinc

14. Malleability of a material can be defined as

Ability to undergo large permanent deformations in compression

All of the above

Ability to recover its original form

Ability to undergo large permanent deformations in tension

15. Balls for ball bearings are made of

Mild steel

Stainless steel

Cast iron

Carbon-chrome steel

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

Twelve

Six

Eighteen

Twenty

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

Alloy cast iron

Nodular cast iron

White cast iron

Malleable cast iron

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

Asbestos cement

Vitrified clay

Concrete

Cast iron

19. 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 grain size first increases and then decreases very rapidly

The average grain size is a minimum

20. Mild steel belongs to the following category

High carbon steel

Low carbon steel

Alloy steel

Medium carbon steel

Page 3 of 4

21. 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

Suddenly in a suitable cooling medium

Slowly in the furnace

Any one of these

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

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

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

23. 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)

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

Increase endurance strength

Increase hardenability

Reduce machinability

Increase wear resistance

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

Hot working

Annealing

Tempering

Normalizing

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

Surface decarburisation

Cold working

Nitriding of surface

Shot peening

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

Plasticity

Resilience

Stiffness

Ductility

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

Babbitt metal

Phosphor bronze

Monel metal

Nichrome

29. Which is false statement about properties of aluminium?

Creep strength limits its use to fairly low temperatures

Wear resistance is very good

Fatigue strength is not high

Modulus of elasticity is fairly low

30. 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

Page 4 of 4

31. White cast iron has

High compressive strength

Carbon in the form of carbide

All of these

Low tensile strength

32. Delta iron occurs at temperature of

Between 910°C and 1400°C

Between 1400°C and 1539°C

Room temperature

Above melting point

33. 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

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

Creep

Fatigue

Plastic deformation

Endurance

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

Hypoeutectic cast irons

Hypereutectic cast irons

Eutectic cast irons

None of these

36. Isotropic materials are those which have the same

Thermal properties in all directions

Elastic properties in all directions

Electric and magnetic properties in all directions

Stresses induced in all directions

37. The elastic stress strain behavior of rubber is

No fixed relationship

Plastic

Nonlinear

Linear

38. The percentage of carbon in low carbon steel is

0.15%

0.05%

0.3%

0.5%

39. Closed packed hexagonal space lattice is found in

None of the above

Zinc, magnesium, cobalt, cadmium, antimony and bismuth

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

Alpha-iron, tungsten, chromium and molybdenum

40. Neutral solution is one which has pH value

Less than 7

Greater than 7

Equal to 7

pH value has nothing to do with neutral solution

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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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