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Engineering Materials
0

Engineering Materials Practice Set-5

May 13, 2021

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Page 1 of 4

1. 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

2. Brass is an alloy of

Copper and zinc

Copper and tin

Copper, tin and zinc

None of these

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

Large surface wear

Light load and pressure

Elevated temperatures

High pressure and load

4. Neutral solution is one which has pH value

Less than 7

Equal to 7

pH value has nothing to do with neutral solution

Greater than 7

5. 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

6. Closed packed hexagonal space lattice is found in

Alpha-iron, tungsten, chromium and molybdenum

None of the above

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

Zinc, magnesium, cobalt, cadmium, antimony and bismuth

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

Pearlite

Ferrite

Austenite

Cementite

8. The molecules in a solid move

In circular motion

Back and forth like tiny pendulums

In a random manner

In a haphazard way

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

Tempering

Normalizing

Annealing

Hot working

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

Decrease

Increase

Remain constant

First increase and then decrease

Page 2 of 4

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

Babbitt metal

Monel metal

Phosphor bronze

Nichrome

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

Endurance

Plastic deformation

Fatigue

Creep

13. Isotropic materials are those which have the same

Stresses induced in all directions

Thermal properties in all directions

Elastic properties in all directions

Electric and magnetic properties in all directions

14. Balls for ball bearings are made of

Mild steel

Carbon-chrome steel

Stainless steel

Cast iron

15. 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

Slowly in the furnace

Suddenly in a suitable cooling medium

In still air

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

(B) Whiteheart cast iron

(A) Blackheart cast iron

(C) Both (A) and (B)

(D) None of these

17. Malleability of a material can be defined as

Ability to recover its original form

All of the above

Ability to undergo large permanent deformations in compression

Ability to undergo large permanent deformations in tension

18. Mild steel belongs to the following category

Medium carbon steel

Alloy steel

High carbon steel

Low carbon steel

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

The average grain size is a minimum

There is no change in grain size

The grain size increases very rapidly

The grain size first increases and then decreases very rapidly

20. Foundry crucible is made of

Mild steel

Graphite

German silver

Lead

Page 3 of 4

21. White cast iron has

Carbon in the form of carbide

All of these

High compressive strength

Low tensile strength

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

Nodular cast iron

White cast iron

Alloy cast iron

Malleable cast iron

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

Concrete

Asbestos cement

Cast iron

Vitrified clay

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

Silicon and manganese has burnt and carbon has started oxidizing

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

Air is burning out silicon and manganese

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

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

Ductility

Plasticity

Stiffness

Resilience

26. Delta iron occurs at temperature of

Between 910°C and 1400°C

Between 1400°C and 1539°C

Above melting point

Room temperature

27. 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

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

Eutectic cast irons

Hypoeutectic cast irons

Hypereutectic cast irons

None of these

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

Increase wear resistance

Increase hardenability

Reduce machinability

Increase endurance strength

30. The steel widely used for motor car crankshafts is

Chrome steel

Nickel steel

Silicon steel

Nickel-chrome steel

Page 4 of 4

31. Which is false statement about properties of aluminium?

Modulus of elasticity is fairly low

Creep strength limits its use to fairly low temperatures

Wear resistance is very good

Fatigue strength is not high

32. The elastic stress strain behavior of rubber is

Linear

No fixed relationship

Plastic

Nonlinear

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

Stack

Throat

Bosh

Tyres

34. Recrystallization temperature is one

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

At which change of allotropic form takes place

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

Cold working

Surface decarburisation

Shot peening

Nitriding of surface

36. The percentage of carbon in low carbon steel is

0.05%

0.15%

0.3%

0.5%

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

Electroplating

Nitriding

Induction hardening

Cyaniding

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

Twelve

Twenty

Six

Eighteen

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

Hot tempering

Creep

Hot hardness

Fatigue

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

Has its atoms distributed in a random pattern

Responds to heat treatment

Has a fixed structure under all conditions

Exists in several crystal forms at different temperatures

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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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