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Engineering Materials
0

Engineering Materials Practice Set-5

May 13, 2021

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Page 1 of 4

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

Increase endurance strength

Reduce machinability

Increase wear resistance

Increase hardenability

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

Fracture due to high impact loads

Deformation under stress

Externally applied forces with breakdown or yielding

None of the above

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

(C) Both (A) and (B)

(B) Whiteheart cast iron

(A) Blackheart cast iron

(D) None of these

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

Cyaniding

Induction hardening

Electroplating

Nitriding

5. Recrystallization temperature is one

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 crystals grow bigger in size

At which change of allotropic form takes place

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

None of these

Eutectic cast irons

Hypereutectic cast irons

Hypoeutectic cast irons

7. White cast iron has

All of these

Low tensile strength

Carbon in the form of carbide

High compressive strength

8. Balls for ball bearings are made of

Cast iron

Carbon-chrome steel

Stainless steel

Mild steel

9. The percentage of carbon in low carbon steel is

0.05%

0.3%

0.5%

0.15%

10. Foundry crucible is made of

German silver

Lead

Graphite

Mild steel

Page 2 of 4

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

Annealing

Tempering

Normalizing

Hot working

12. Isotropic materials are those which have the same

Stresses induced in all directions

Electric and magnetic properties in all directions

Thermal properties in all directions

Elastic properties in all directions

13. The molecules in a solid move

In a haphazard way

In circular motion

Back and forth like tiny pendulums

In a random manner

14. Delta iron occurs at temperature of

Between 910°C and 1400°C

Above melting point

Room temperature

Between 1400°C and 1539°C

15. Brass is an alloy of

Copper, tin and zinc

Copper and tin

None of these

Copper and zinc

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

Twelve

Six

Eighteen

Twenty

17. Mild steel belongs to the following category

High carbon steel

Alloy steel

Low carbon steel

Medium carbon steel

18. 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

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

Ferrite

Austenite

Pearlite

Cementite

20. Following elements have face-centered cubic structure

Mg, Zn, Ti, Zr, Br, Cd

All of the above

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

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

Page 3 of 4

21. 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

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

Bosh

Stack

Tyres

Throat

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

Light load and pressure

Elevated temperatures

High pressure and load

Large surface wear

24. 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

25. The elastic stress strain behavior of rubber is

Nonlinear

Linear

No fixed relationship

Plastic

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

Fatigue

Endurance

Plastic deformation

Creep

27. The steel widely used for motor car crankshafts is

Nickel steel

Nickel-chrome steel

Silicon steel

Chrome steel

28. 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

Suddenly in a suitable cooling medium

In still air

Slowly in the furnace

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

Surface decarburisation

Cold working

Nitriding of surface

Shot peening

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

Vitrified clay

Concrete

Asbestos cement

Cast iron

Page 4 of 4

31. Neutral solution is one which has pH value

pH value has nothing to do with neutral solution

Greater than 7

Equal to 7

Less than 7

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

There is no change in grain size

The average grain size is a minimum

The grain size first increases and then decreases very rapidly

The grain size increases very rapidly

33. Malleability of a material can be defined as

Ability to undergo large permanent deformations in tension

Ability to recover its original form

Ability to undergo large permanent deformations in compression

All of the above

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

White cast iron

Nodular cast iron

Malleable cast iron

Alloy cast iron

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

Fatigue

Creep

Hot hardness

Hot tempering

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

Plasticity

Stiffness

Ductility

Resilience

37. 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

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

Exists in several crystal forms at different temperatures

Responds to heat treatment

Has its atoms distributed in a random pattern

Has a fixed structure under all conditions

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

Body centered cubic space lattice

Face centered cubic space lattice

Close packed hexagonal space lattice

None of these

40. Which is false statement about properties of aluminium?

Fatigue strength is not high

Wear resistance is very good

Modulus of elasticity is fairly low

Creep strength limits its use to fairly low temperatures

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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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