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Engineering Materials
0

Engineering Materials Practice Set-5

May 13, 2021

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Page 1 of 4

1. Foundry crucible is made of

German silver

Graphite

Lead

Mild steel

2. Balls for ball bearings are made of

Cast iron

Carbon-chrome steel

Stainless steel

Mild steel

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

Elevated temperatures

High pressure and load

Large surface wear

Light load and pressure

4. Delta iron occurs at temperature of

Above melting point

Room temperature

Between 1400°C and 1539°C

Between 910°C and 1400°C

5. Recrystallization temperature is one

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

At which crystals grow bigger in size

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

(C) Both (A) and (B)

(D) None of these

(B) Whiteheart cast iron

(A) Blackheart cast iron

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

Asbestos cement

Concrete

Vitrified clay

Cast iron

8. Mild steel belongs to the following category

Medium carbon steel

Alloy steel

High carbon steel

Low carbon steel

9. 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

10. 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

Page 2 of 4

11. Brass is an alloy of

Copper, tin and zinc

None of these

Copper and zinc

Copper and tin

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

Austenite

Pearlite

Cementite

Ferrite

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

Nodular cast iron

White cast iron

Malleable cast iron

Alloy cast iron

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

Hot tempering

Creep

Hot hardness

Fatigue

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

Cyaniding

Nitriding

Electroplating

Induction hardening

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

In still air

Slowly in the furnace

Any one of these

Suddenly in a suitable cooling medium

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

Eighteen

Six

Twelve

Twenty

18. 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

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

Decrease

Remain constant

Increase

First increase and then decrease

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

The grain size first increases and then decreases very rapidly

The average grain size is a minimum

The grain size increases very rapidly

There is no change in grain size

Page 3 of 4

21. White cast iron has

High compressive strength

All of these

Low tensile strength

Carbon in the form of carbide

22. Following elements have face-centered cubic structure

A iron (below 910°C and between 1400 to 1539°C), W

Mg, Zn, Ti, Zr, Br, Cd

Gamma iron (910° to 1400°C), Cu, Ag, Au, Al, Ni, Pb, Pt

All of the above

23. The steel widely used for motor car crankshafts is

Nickel-chrome steel

Nickel steel

Chrome steel

Silicon steel

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

Fatigue

Endurance

Plastic deformation

Creep

25. Malleability of a material can be defined as

All of the above

Ability to undergo large permanent deformations in tension

Ability to undergo large permanent deformations in compression

Ability to recover its original form

26. The elastic stress strain behavior of rubber is

Plastic

Linear

No fixed relationship

Nonlinear

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

Hot working

Annealing

Tempering

Normalizing

28. Which is false statement about properties of aluminium?

Fatigue strength is not high

Creep strength limits its use to fairly low temperatures

Modulus of elasticity is fairly low

Wear resistance is very good

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

Externally applied forces with breakdown or yielding

Deformation under stress

Fracture due to high impact loads

None of the above

30. 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

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. The charge is fed into the blast furnace through the

Throat

Bosh

Stack

Tyres

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

Shot peening

Surface decarburisation

Cold working

Nitriding of surface

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

Has its atoms distributed in a random pattern

Has a fixed structure under all conditions

Exists in several crystal forms at different temperatures

Responds to heat treatment

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

Resilience

Stiffness

Ductility

Plasticity

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

Increase wear resistance

Increase hardenability

Reduce machinability

Increase endurance strength

37. 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

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

Silicon and manganese has burnt and carbon has started oxidizing

38. The percentage of carbon in low carbon steel is

0.15%

0.5%

0.3%

0.05%

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

Babbitt metal

Monel metal

Phosphor bronze

Nichrome

40. The molecules in a solid move

In circular motion

Back and forth like tiny pendulums

In a random manner

In a haphazard way

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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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