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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 elastic stress strain behavior of rubber is

Nonlinear

No fixed relationship

Linear

Plastic

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

Malleable cast iron

White cast iron

Alloy cast iron

Nodular cast iron

3. Mild steel belongs to the following category

High carbon steel

Medium carbon steel

Low carbon steel

Alloy steel

4. Neutral solution is one which has pH value

Greater than 7

Equal to 7

Less than 7

pH value has nothing to do with neutral solution

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

Hot tempering

Creep

Fatigue

Hot hardness

6. 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 first start forming from molten metal when it is cooled

At which crystals grow bigger in size

7. Malleability of a material can be defined as

Ability to recover its original form

Ability to undergo large permanent deformations in compression

Ability to undergo large permanent deformations in tension

All of the above

8. Brass is an alloy of

None of these

Copper, tin and zinc

Copper and zinc

Copper and tin

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

Concrete

Vitrified clay

Asbestos cement

Cast iron

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

Remain constant

Increase

Decrease

First increase and then decrease

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

Phosphor bronze

Nichrome

Babbitt metal

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

Reduce machinability

Increase endurance strength

Increase wear resistance

Increase hardenability

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

Ferrite

Pearlite

Cementite

Austenite

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

Light load and pressure

High pressure and load

Large surface wear

Elevated temperatures

15. Isotropic materials are those which have the same

Elastic properties in all directions

Thermal properties in all directions

Stresses induced in all directions

Electric and magnetic properties in all directions

16. Closed packed hexagonal space lattice is found in

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

Zinc, magnesium, cobalt, cadmium, antimony and bismuth

Alpha-iron, tungsten, chromium and molybdenum

None of the above

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

None of the above

Deformation under stress

Fracture due to high impact loads

Externally applied forces with breakdown or yielding

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

Eutectic cast irons

Hypoeutectic cast irons

Hypereutectic cast irons

None of these

19. The molecules in a solid move

Back and forth like tiny pendulums

In a random manner

In circular motion

In a haphazard way

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

Plasticity

Stiffness

Ductility

Resilience

Page 3 of 4

21. The steel widely used for motor car crankshafts is

Nickel-chrome steel

Chrome steel

Nickel steel

Silicon steel

22. 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

23. The percentage of carbon in low carbon steel is

0.05%

0.5%

0.3%

0.15%

24. 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

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

Endurance

Fatigue

Creep

Plastic deformation

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

Hot working

Normalizing

Annealing

Tempering

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

Close packed hexagonal space lattice

None of these

Face centered cubic space lattice

Body centered cubic space lattice

28. Delta iron occurs at temperature of

Above melting point

Room temperature

Between 1400°C and 1539°C

Between 910°C and 1400°C

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

Shot peening

Nitriding of surface

Surface decarburisation

Cold working

30. White cast iron has

All of these

Carbon in the form of carbide

High compressive strength

Low tensile strength

Page 4 of 4

31. Foundry crucible is made of

German silver

Graphite

Lead

Mild steel

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

There is no change in grain size

The grain size increases very rapidly

The average grain size is a minimum

The grain size first increases and then decreases very rapidly

33. 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

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

(D) None of these

(C) Both (A) and (B)

(A) Blackheart cast iron

(B) Whiteheart cast iron

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

Has a fixed structure under all conditions

Responds to heat treatment

Exists in several crystal forms at different temperatures

Has its atoms distributed in a random pattern

36. Balls for ball bearings are made of

Carbon-chrome steel

Mild steel

Stainless steel

Cast iron

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

Eighteen

Six

Twenty

Twelve

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

Slowly in the furnace

In still air

Any one of these

Suddenly in a suitable cooling medium

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

Induction hardening

Cyaniding

Nitriding

Electroplating

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

Stack

Throat

Tyres

Bosh

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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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