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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 is not the correct method of increasing fatigue limit?

Nitriding of surface

Surface decarburisation

Cold working

Shot peening

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

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

Silicon and manganese has burnt and carbon has started oxidizing

Air is burning out silicon and manganese

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

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

Malleable cast iron

Nodular cast iron

White cast iron

Alloy cast iron

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

Fatigue

Hot hardness

Hot tempering

Creep

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

Electroplating

Nitriding

Induction hardening

Cyaniding

6. 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

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

Increase endurance strength

Reduce machinability

Increase hardenability

Increase wear resistance

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

Has its atoms distributed in a random pattern

Exists in several crystal forms at different temperatures

Responds to heat treatment

Has a fixed structure under all conditions

9. 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

10. 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

Page 2 of 4

11. White cast iron has

Carbon in the form of carbide

All of these

Low tensile strength

High compressive strength

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

Endurance

Plastic deformation

Creep

Fatigue

13. The elastic stress strain behavior of rubber is

Plastic

Linear

Nonlinear

No fixed relationship

14. 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

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

Eighteen

Twenty

Six

Twelve

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

Externally applied forces with breakdown or yielding

None of the above

Deformation under stress

Fracture due to high impact loads

17. Delta iron occurs at temperature of

Above melting point

Room temperature

Between 910°C and 1400°C

Between 1400°C and 1539°C

18. Closed packed hexagonal space lattice is found in

None of the above

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

Alpha-iron, tungsten, chromium and molybdenum

Zinc, magnesium, cobalt, cadmium, antimony and bismuth

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

Elevated temperatures

Light load and pressure

Large surface wear

High pressure and load

20. The steel widely used for motor car crankshafts is

Silicon steel

Nickel-chrome steel

Nickel steel

Chrome steel

Page 3 of 4

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

The grain size increases very rapidly

The average grain size is a minimum

There is no change in grain size

The grain size first increases and then decreases very rapidly

22. Foundry crucible is made of

German silver

Lead

Graphite

Mild steel

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

Plasticity

Ductility

Resilience

Stiffness

24. 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

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

Decrease

First increase and then decrease

Increase

Remain constant

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

Hypereutectic cast irons

Hypoeutectic cast irons

Eutectic cast irons

None of these

27. The molecules in a solid move

In a haphazard way

In circular motion

Back and forth like tiny pendulums

In a random manner

28. Brass is an alloy of

Copper and tin

Copper, tin and zinc

Copper and zinc

None of these

29. Malleability of a material can be defined as

All of the above

Ability to undergo large permanent deformations in compression

Ability to undergo large permanent deformations in tension

Ability to recover its original form

30. 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

Page 4 of 4

31. 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

Any one of these

In still air

Slowly in the furnace

32. Balls for ball bearings are made of

Mild steel

Cast iron

Stainless steel

Carbon-chrome steel

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

Stack

Bosh

Tyres

Throat

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

Ferrite

Cementite

Pearlite

Austenite

35. Mild steel belongs to the following category

Medium carbon steel

High carbon steel

Low carbon steel

Alloy steel

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

Hot working

Tempering

Normalizing

Annealing

37. Recrystallization temperature is one

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 crystals first start forming from molten metal when it is cooled

At which change of allotropic form takes place

38. The percentage of carbon in low carbon steel is

0.15%

0.05%

0.5%

0.3%

39. Neutral solution is one which has pH value

Equal to 7

pH value has nothing to do with neutral solution

Less than 7

Greater than 7

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

Vitrified clay

Cast iron

Concrete

Asbestos cement

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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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