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

Babbitt metal

Nichrome

Phosphor bronze

Monel metal

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

Austenite

Pearlite

Ferrite

Cementite

3. Mild steel belongs to the following category

Low carbon steel

Alloy steel

Medium carbon steel

High carbon steel

4. 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

5. Isotropic materials are those which have the same

Electric and magnetic properties in all directions

Thermal properties in all directions

Elastic properties in all directions

Stresses induced in all directions

6. The molecules in a solid move

In a random manner

In circular motion

In a haphazard way

Back and forth like tiny pendulums

7. The elastic stress strain behavior of rubber is

No fixed relationship

Plastic

Nonlinear

Linear

8. Recrystallization temperature is one

At which change of allotropic form takes place

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

At which crystals grow bigger in size

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

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

Close packed hexagonal space lattice

Body centered cubic space lattice

None of these

Face centered cubic space lattice

10. Malleability of a material can be defined as

Ability to undergo large permanent deformations in compression

All of the above

Ability to undergo large permanent deformations in tension

Ability to recover its original form

Page 2 of 4

11. 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

Suddenly in a suitable cooling medium

In still air

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

Plasticity

Resilience

Stiffness

Ductility

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

Hot working

Tempering

Annealing

Normalizing

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

Twenty

Twelve

Six

Eighteen

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

Stack

Throat

Tyres

Bosh

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

(C) Both (A) and (B)

(B) Whiteheart cast iron

(D) None of these

(A) Blackheart cast iron

17. Balls for ball bearings are made of

Stainless steel

Cast iron

Mild steel

Carbon-chrome steel

18. White cast iron has

All of these

Carbon in the form of carbide

High compressive strength

Low tensile strength

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

Increase hardenability

Increase wear resistance

Reduce machinability

Increase endurance strength

20. The steel widely used for motor car crankshafts is

Silicon steel

Nickel-chrome steel

Chrome steel

Nickel steel

Page 3 of 4

21. Which is false statement about properties of aluminium?

Creep strength limits its use to fairly low temperatures

Modulus of elasticity is fairly low

Fatigue strength is not high

Wear resistance is very good

22. Neutral solution is one which has pH value

Equal to 7

Less than 7

Greater than 7

pH value has nothing to do with neutral solution

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

Alloy cast iron

White cast iron

Nodular cast iron

Malleable cast iron

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

Deformation under stress

Fracture due to high impact loads

None of the above

Externally applied forces with breakdown or yielding

25. 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

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

Eutectic cast irons

Hypereutectic cast irons

Hypoeutectic cast irons

None of these

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

Induction hardening

Nitriding

Cyaniding

Electroplating

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

First increase and then decrease

Increase

Remain constant

Decrease

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

Concrete

Asbestos cement

Cast iron

Vitrified clay

30. Following elements have face-centered cubic structure

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

All of the above

Mg, Zn, Ti, Zr, Br, Cd

Page 4 of 4

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

Endurance

Fatigue

Creep

Plastic deformation

32. Foundry crucible is made of

Graphite

German silver

Lead

Mild steel

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

Creep

Fatigue

Hot tempering

Hot hardness

34. The percentage of carbon in low carbon steel is

0.15%

0.5%

0.05%

0.3%

35. Brass is an alloy of

Copper, tin and zinc

Copper and tin

Copper and zinc

None of these

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

Nitriding of surface

Shot peening

Cold working

Surface decarburisation

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

Air is burning out silicon and manganese

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

Silicon and manganese has burnt and carbon has started oxidizing

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

38. 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

39. Closed packed hexagonal space lattice is found in

Zinc, magnesium, cobalt, cadmium, antimony and bismuth

Alpha-iron, tungsten, chromium and molybdenum

None of the above

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

40. Delta iron occurs at temperature of

Between 1400°C and 1539°C

Between 910°C and 1400°C

Room temperature

Above melting point

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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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