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Engineering Materials
0

Engineering Materials Practice Set-5

May 13, 2021

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Page 1 of 4

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

Hot working

Normalizing

Tempering

Annealing

2. The steel widely used for motor car crankshafts is

Silicon steel

Nickel steel

Chrome steel

Nickel-chrome steel

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

Silicon and manganese has burnt and carbon has started oxidizing

Air is burning out silicon and manganese

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

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

4. Brass is an alloy of

Copper and zinc

None of these

Copper, tin and zinc

Copper and tin

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

The average grain size is a minimum

The grain size increases very rapidly

There is no change in grain size

The grain size first increases and then decreases very rapidly

6. The elastic stress strain behavior of rubber is

Linear

Nonlinear

Plastic

No fixed relationship

7. Foundry crucible is made of

German silver

Lead

Graphite

Mild steel

8. Delta iron occurs at temperature of

Above melting point

Between 1400°C and 1539°C

Room temperature

Between 910°C and 1400°C

9. 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

Slowly in the furnace

In still air

10. 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

Page 2 of 4

11. Balls for ball bearings are made of

Mild steel

Cast iron

Stainless steel

Carbon-chrome steel

12. Which is false statement about properties of aluminium?

Wear resistance is very good

Creep strength limits its use to fairly low temperatures

Modulus of elasticity is fairly low

Fatigue strength is not high

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

Fatigue

Hot hardness

Creep

Hot tempering

14. Neutral solution is one which has pH value

Less than 7

Greater than 7

pH value has nothing to do with neutral solution

Equal to 7

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

Eutectic cast irons

Hypereutectic cast irons

Hypoeutectic cast irons

None of these

16. Mild steel belongs to the following category

Low carbon steel

Alloy steel

Medium carbon steel

High carbon steel

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

Cast iron

Vitrified clay

Asbestos cement

Concrete

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

Fatigue

Creep

Endurance

Plastic deformation

19. The percentage of carbon in low carbon steel is

0.3%

0.05%

0.15%

0.5%

20. 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

Page 3 of 4

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

First increase and then decrease

Increase

Decrease

Remain constant

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

Plasticity

Resilience

Stiffness

Ductility

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

Monel metal

Babbitt metal

Nichrome

Phosphor bronze

24. The molecules in a solid move

Back and forth like tiny pendulums

In circular motion

In a haphazard way

In a random manner

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

Alloy cast iron

Malleable cast iron

Nodular cast iron

White cast iron

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

Throat

Bosh

Stack

Tyres

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

Responds to heat treatment

Has its atoms distributed in a random pattern

Has a fixed structure under all conditions

Exists in several crystal forms at different temperatures

28. 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

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

Electroplating

Cyaniding

Nitriding

Induction hardening

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

Cold working

Nitriding of surface

Shot peening

Surface decarburisation

Page 4 of 4

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

None of the above

Fracture due to high impact loads

Externally applied forces with breakdown or yielding

Deformation under stress

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

High pressure and load

Light load and pressure

Elevated temperatures

Large surface wear

33. Recrystallization temperature is one

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 grow bigger in size

At which crystals first start forming from molten metal when it is cooled

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

(B) Whiteheart cast iron

(D) None of these

(C) Both (A) and (B)

(A) Blackheart cast iron

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

Eighteen

Twelve

Six

Twenty

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

Austenite

Pearlite

Cementite

Ferrite

37. Closed packed hexagonal space lattice is found in

None of the above

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

Zinc, magnesium, cobalt, cadmium, antimony and bismuth

Alpha-iron, tungsten, chromium and molybdenum

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

Reduce machinability

Increase hardenability

Increase wear resistance

Increase endurance strength

39. White cast iron has

Carbon in the form of carbide

High compressive strength

All of these

Low tensile strength

40. Following elements have face-centered cubic structure

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

Mg, Zn, Ti, Zr, Br, Cd

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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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