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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 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

2. The steel widely used for motor car crankshafts is

Nickel-chrome steel

Nickel steel

Chrome steel

Silicon steel

3. Mild steel belongs to the following category

Low carbon steel

High carbon steel

Alloy steel

Medium carbon steel

4. The percentage of carbon in low carbon steel is

0.05%

0.5%

0.15%

0.3%

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

Asbestos cement

Concrete

Cast iron

Vitrified clay

6. Balls for ball bearings are made of

Carbon-chrome steel

Mild steel

Stainless steel

Cast iron

7. The molecules in a solid move

In a haphazard way

In a random manner

In circular motion

Back and forth like tiny pendulums

8. Closed packed hexagonal space lattice is found in

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

None of the above

Zinc, magnesium, cobalt, cadmium, antimony and bismuth

Alpha-iron, tungsten, chromium and molybdenum

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

The grain size increases very rapidly

There is no change in grain size

The grain size first increases and then decreases very rapidly

The average grain size is a minimum

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

Annealing

Normalizing

Tempering

Hot working

Page 2 of 4

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

Monel metal

Babbitt metal

Phosphor bronze

Nichrome

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

(C) Both (A) and (B)

(D) None of these

(A) Blackheart cast iron

(B) Whiteheart cast iron

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

Plasticity

Stiffness

Resilience

Ductility

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

Hot hardness

Fatigue

Creep

Hot tempering

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

Cold working

Shot peening

Nitriding of surface

Surface decarburisation

16. 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

17. 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

In still air

Any one of these

Slowly in the furnace

18. Neutral solution is one which has pH value

Greater than 7

pH value has nothing to do with neutral solution

Equal to 7

Less than 7

19. The elastic stress strain behavior of rubber is

Linear

Plastic

Nonlinear

No fixed relationship

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

White cast iron

Malleable cast iron

Alloy cast iron

Nodular cast iron

Page 3 of 4

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

Increase hardenability

Increase wear resistance

Increase endurance strength

Reduce machinability

22. Delta iron occurs at temperature of

Between 1400°C and 1539°C

Room temperature

Above melting point

Between 910°C and 1400°C

23. Foundry crucible is made of

Mild steel

German silver

Graphite

Lead

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

Deformation under stress

None of the above

Fracture due to high impact loads

Externally applied forces with breakdown or yielding

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

Plastic deformation

Creep

Endurance

Fatigue

26. 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

27. 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

28. 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

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

Induction hardening

Nitriding

Cyaniding

Electroplating

30. 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

Page 4 of 4

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

Face centered cubic space lattice

None of these

Body centered cubic space lattice

Close packed hexagonal space lattice

32. White cast iron has

Low tensile strength

Carbon in the form of carbide

High compressive strength

All of these

33. Brass is an alloy of

Copper and zinc

Copper, tin and zinc

Copper and tin

None of these

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

Throat

Tyres

Bosh

Stack

35. Malleability of a material can be defined as

Ability to undergo large permanent deformations in tension

All of the above

Ability to recover its original form

Ability to undergo large permanent deformations in compression

36. Recrystallization temperature is one

At which crystals grow bigger in size

At which change of allotropic form takes place

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

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

Ferrite

Pearlite

Cementite

Austenite

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

Twelve

Twenty

Eighteen

Six

39. Following elements have face-centered cubic structure

Mg, Zn, Ti, Zr, Br, Cd

All of the above

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

40. Which is false statement about properties of aluminium?

Fatigue strength is not high

Creep strength limits its use to fairly low temperatures

Wear resistance is very good

Modulus of elasticity is fairly low

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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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