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Engineering Materials
0

Engineering Materials Practice Set-5

May 13, 2021

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Page 1 of 4

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

Creep

Fatigue

Plastic deformation

Endurance

2. White cast iron has

Low tensile strength

All of these

Carbon in the form of carbide

High compressive strength

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

Tyres

Throat

Stack

Bosh

4. 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

5. Isotropic materials are those which have the same

Stresses induced in all directions

Thermal properties in all directions

Electric and magnetic properties in all directions

Elastic properties in all directions

6. Recrystallization temperature is one

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

At which new spherical crystals first begin to form from the old deformed one when a strained metal is heated

At which change of allotropic form takes place

At which crystals grow bigger in size

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

Cyaniding

Electroplating

Induction hardening

Nitriding

8. 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)

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

The average grain size is a minimum

The grain size increases very rapidly

The grain size first increases and then decreases very rapidly

There is no change in grain size

10. Balls for ball bearings are made of

Stainless steel

Cast iron

Mild steel

Carbon-chrome steel

Page 2 of 4

11. Which is false statement about properties of aluminium?

Creep strength limits its use to fairly low temperatures

Fatigue strength is not high

Modulus of elasticity is fairly low

Wear resistance is very good

12. Foundry crucible is made of

German silver

Graphite

Mild steel

Lead

13. The elastic stress strain behavior of rubber is

Plastic

Linear

Nonlinear

No fixed relationship

14. Malleability of a material can be defined as

All of the above

Ability to recover its original form

Ability to undergo large permanent deformations in tension

Ability to undergo large permanent deformations in compression

15. 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

Any one of these

Suddenly in a suitable cooling medium

Slowly in the furnace

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

Decrease

Remain constant

First increase and then decrease

Increase

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

Hot hardness

Fatigue

Creep

Hot tempering

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

None of the above

Externally applied forces with breakdown or yielding

Deformation under stress

Fracture due to high impact loads

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

Six

Twenty

Eighteen

Twelve

20. The percentage of carbon in low carbon steel is

0.15%

0.3%

0.5%

0.05%

Page 3 of 4

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

Stiffness

Ductility

Plasticity

Resilience

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

Austenite

Cementite

Pearlite

Ferrite

23. The steel widely used for motor car crankshafts is

Silicon steel

Nickel-chrome steel

Nickel steel

Chrome steel

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

Air is burning out silicon and manganese

Silicon and manganese has burnt and carbon has started oxidizing

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

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

None of these

Hypereutectic cast irons

Hypoeutectic cast irons

Eutectic cast irons

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

Cast iron

Asbestos cement

Vitrified clay

Concrete

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

None of these

Face centered cubic space lattice

Close packed hexagonal space lattice

Body centered cubic space lattice

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

White cast iron

Alloy cast iron

Nodular cast iron

Malleable cast iron

29. Brass is an alloy of

Copper, tin and zinc

None of these

Copper and tin

Copper and zinc

30. Following elements have face-centered cubic structure

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

All of the above

Mg, Zn, Ti, Zr, Br, Cd

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

Page 4 of 4

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

Increase endurance strength

Increase hardenability

Reduce machinability

Increase wear resistance

32. Delta iron occurs at temperature of

Between 910°C and 1400°C

Room temperature

Above melting point

Between 1400°C and 1539°C

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

Light load and pressure

Elevated temperatures

Large surface wear

High pressure and load

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

Responds to heat treatment

Has a fixed structure under all conditions

Has its atoms distributed in a random pattern

Exists in several crystal forms at different temperatures

35. Neutral solution is one which has pH value

Equal to 7

pH value has nothing to do with neutral solution

Greater than 7

Less than 7

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

Babbitt metal

Nichrome

Monel metal

Phosphor bronze

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

Normalizing

Hot working

Annealing

Tempering

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

Surface decarburisation

Cold working

Shot peening

Nitriding of surface

39. The molecules in a solid move

In circular motion

In a haphazard way

In a random manner

Back and forth like tiny pendulums

40. Mild steel belongs to the following category

High carbon steel

Low carbon steel

Medium carbon steel

Alloy steel

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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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