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Engineering Materials
0

Engineering Materials Practice Set-5

May 13, 2021

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Page 1 of 4

1. The molecules in a solid move

In circular motion

Back and forth like tiny pendulums

In a haphazard way

In a random manner

2. Which is false statement about properties of aluminium?

Modulus of elasticity is fairly low

Fatigue strength is not high

Wear resistance is very good

Creep strength limits its use to fairly low temperatures

3. White cast iron has

Carbon in the form of carbide

High compressive strength

Low tensile strength

All of these

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

Twelve

Twenty

Eighteen

Six

5. 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

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

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

7. The elastic stress strain behavior of rubber is

Plastic

No fixed relationship

Linear

Nonlinear

8. Foundry crucible is made of

German silver

Lead

Mild steel

Graphite

9. 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

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

Electroplating

Cyaniding

Induction hardening

Nitriding

Page 2 of 4

11. Delta iron occurs at temperature of

Room temperature

Between 1400°C and 1539°C

Between 910°C and 1400°C

Above melting point

12. Closed packed hexagonal space lattice is found in

Zinc, magnesium, cobalt, cadmium, antimony and bismuth

None of the above

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

Alpha-iron, tungsten, chromium and molybdenum

13. Following elements have face-centered cubic structure

All of the above

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

Mg, Zn, Ti, Zr, Br, Cd

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

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

Suddenly in a suitable cooling medium

Slowly in the furnace

In still air

Any one of these

15. The steel widely used for motor car crankshafts is

Nickel steel

Chrome steel

Nickel-chrome steel

Silicon steel

16. Brass is an alloy of

Copper and tin

Copper, tin and zinc

Copper and zinc

None of these

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

Remain constant

First increase and then decrease

Increase

Decrease

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

Babbitt metal

Nichrome

Monel metal

Phosphor bronze

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

Large surface wear

High pressure and load

Light load and pressure

Elevated temperatures

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

Hot hardness

Creep

Hot tempering

Fatigue

Page 3 of 4

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

(A) Blackheart cast iron

(D) None of these

(B) Whiteheart cast iron

(C) Both (A) and (B)

22. Malleability of a material can be defined as

Ability to recover its original form

Ability to undergo large permanent deformations in compression

All of the above

Ability to undergo large permanent deformations in tension

23. 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

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

Fracture due to high impact loads

Deformation under stress

None of the above

Externally applied forces with breakdown or yielding

25. The percentage of carbon in low carbon steel is

0.15%

0.3%

0.05%

0.5%

26. 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

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

Hypoeutectic cast irons

Hypereutectic cast irons

None of these

Eutectic cast irons

28. Neutral solution is one which has pH value

Greater than 7

Less than 7

pH value has nothing to do with neutral solution

Equal to 7

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

Austenite

Pearlite

Cementite

Ferrite

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

Plastic deformation

Endurance

Creep

Fatigue

Page 4 of 4

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

Cold working

Surface decarburisation

Shot peening

Nitriding of surface

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

Tempering

Annealing

Hot working

Normalizing

33. Mild steel belongs to the following category

High carbon steel

Alloy steel

Low carbon steel

Medium carbon steel

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

Throat

Bosh

Stack

Tyres

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

None of these

Body centered cubic space lattice

Face centered cubic space lattice

Close packed hexagonal space lattice

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

Cast iron

Asbestos cement

Vitrified clay

Concrete

37. Balls for ball bearings are made of

Cast iron

Stainless steel

Mild steel

Carbon-chrome steel

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

Has a fixed structure under all conditions

Has its atoms distributed in a random pattern

Exists in several crystal forms at different temperatures

Responds to heat treatment

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

Reduce machinability

Increase hardenability

Increase wear resistance

Increase endurance strength

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

Ductility

Stiffness

Resilience

Plasticity

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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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