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Engineering Materials
0

Engineering Materials Practice Set-5

May 13, 2021

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Page 1 of 4

1. White cast iron has

Carbon in the form of carbide

All of these

Low tensile strength

High compressive strength

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

Deformation under stress

Externally applied forces with breakdown or yielding

Fracture due to high impact loads

None of the above

3. Balls for ball bearings are made of

Mild steel

Cast iron

Carbon-chrome steel

Stainless steel

4. The molecules in a solid move

In a haphazard way

Back and forth like tiny pendulums

In a random manner

In circular motion

5. The elastic stress strain behavior of rubber is

Nonlinear

Plastic

No fixed relationship

Linear

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

Ductility

Resilience

Plasticity

Stiffness

7. Brass is an alloy of

Copper and zinc

None of these

Copper and tin

Copper, tin and zinc

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

There is no change in grain size

The grain size first increases and then decreases very rapidly

The grain size increases very rapidly

The average grain size is a minimum

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

Nitriding of surface

Shot peening

Cold working

Surface decarburisation

10. Following elements have face-centered cubic structure

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

All of the above

Page 2 of 4

11. Which is false statement about properties of aluminium?

Fatigue strength is not high

Modulus of elasticity is fairly low

Creep strength limits its use to fairly low temperatures

Wear resistance is very good

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

Cyaniding

Induction hardening

Electroplating

Nitriding

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

Remain constant

Decrease

First increase and then decrease

Increase

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

Six

Twelve

Twenty

Eighteen

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

Nichrome

Phosphor bronze

Babbitt metal

Monel metal

16. Foundry crucible is made of

German silver

Graphite

Mild steel

Lead

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

Cementite

Ferrite

Pearlite

Austenite

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

Large surface wear

Elevated temperatures

High pressure and load

Light load and pressure

19. The percentage of carbon in low carbon steel is

0.3%

0.05%

0.15%

0.5%

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

Body centered cubic space lattice

Face centered cubic space lattice

None of these

Close packed hexagonal space lattice

Page 3 of 4

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

Annealing

Hot working

Normalizing

Tempering

22. Closed packed hexagonal space lattice is found in

Zinc, magnesium, cobalt, cadmium, antimony and bismuth

Alpha-iron, tungsten, chromium and molybdenum

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

None of the above

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

Increase wear resistance

Increase endurance strength

Reduce machinability

Increase hardenability

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

Vitrified clay

Asbestos cement

Cast iron

Concrete

25. Neutral solution is one which has pH value

pH value has nothing to do with neutral solution

Less than 7

Greater than 7

Equal to 7

26. 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

Slowly in the furnace

In still air

Suddenly in a suitable cooling medium

27. Recrystallization temperature is one

At which crystals grow bigger in size

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

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

28. The steel widely used for motor car crankshafts is

Chrome steel

Nickel-chrome steel

Nickel steel

Silicon steel

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

Plastic deformation

Creep

Fatigue

Endurance

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

Malleable cast iron

Alloy cast iron

Nodular cast iron

White cast iron

Page 4 of 4

31. Isotropic materials are those which have the same

Electric and magnetic properties in all directions

Elastic properties in all directions

Thermal properties in all directions

Stresses induced in all directions

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

Hypoeutectic cast irons

Hypereutectic cast irons

None of these

Eutectic cast irons

33. Delta iron occurs at temperature of

Room temperature

Above melting point

Between 910°C and 1400°C

Between 1400°C and 1539°C

34. Mild steel belongs to the following category

Alloy steel

Low carbon steel

High carbon steel

Medium carbon steel

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

(D) None of these

(A) Blackheart cast iron

(B) Whiteheart cast iron

(C) Both (A) and (B)

36. 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

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

Air is burning out silicon and manganese

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

Hot tempering

Creep

Fatigue

Hot hardness

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

Throat

Bosh

Stack

Tyres

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

Responds to heat treatment

Has its atoms distributed in a random pattern

Exists in several crystal forms at different temperatures

Has a fixed structure under all conditions

40. 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 tension

Ability to undergo large permanent deformations in compression

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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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