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Engineering Materials
0

Engineering Materials Practice Set-5

May 13, 2021

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Page 1 of 4

1. 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

Any one of these

Suddenly in a suitable cooling medium

In still air

2. Closed packed hexagonal space lattice is found in

Alpha-iron, tungsten, chromium and molybdenum

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

Zinc, magnesium, cobalt, cadmium, antimony and bismuth

None of the above

3. Delta iron occurs at temperature of

Above melting point

Between 910°C and 1400°C

Room temperature

Between 1400°C and 1539°C

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

(B) Whiteheart cast iron

(A) Blackheart cast iron

(C) Both (A) and (B)

(D) None of these

5. Malleability of a material can be defined as

Ability to undergo large permanent deformations in compression

Ability to recover its original form

Ability to undergo large permanent deformations in tension

All of the above

6. Mild steel belongs to the following category

Alloy steel

Medium carbon steel

Low carbon steel

High carbon steel

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

Annealing

Tempering

Hot working

Normalizing

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

Throat

Bosh

Stack

Tyres

9. The elastic stress strain behavior of rubber is

Plastic

Linear

No fixed relationship

Nonlinear

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

Plastic deformation

Creep

Fatigue

Endurance

Page 2 of 4

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

Phosphor bronze

Nichrome

Monel metal

Babbitt metal

12. Foundry crucible is made of

German silver

Graphite

Mild steel

Lead

13. 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

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

Silicon and manganese has burnt and carbon has started oxidizing

Air is burning out silicon and manganese

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

Concrete

Asbestos cement

Vitrified clay

Cast iron

15. Isotropic materials are those which have the same

Elastic properties in all directions

Stresses induced in all directions

Thermal properties in all directions

Electric and magnetic properties in all directions

16. 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

All of the above

Mg, Zn, Ti, Zr, Br, Cd

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

Large surface wear

High pressure and load

Light load and pressure

Elevated temperatures

18. White cast iron has

All of these

Low tensile strength

High compressive strength

Carbon in the form of carbide

19. Brass is an alloy of

Copper and tin

Copper and zinc

Copper, tin and zinc

None of these

20. Neutral solution is one which has pH value

Equal to 7

Greater than 7

pH value has nothing to do with neutral solution

Less than 7

Page 3 of 4

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

Hot tempering

Hot hardness

Fatigue

Creep

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

The average grain size is a minimum

There is no change in grain size

The grain size increases very rapidly

The grain size first increases and then decreases very rapidly

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

Induction hardening

Cyaniding

Electroplating

Nitriding

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

Pearlite

Austenite

Ferrite

Cementite

25. Balls for ball bearings are made of

Stainless steel

Cast iron

Carbon-chrome steel

Mild steel

26. The molecules in a solid move

In a haphazard way

In circular motion

Back and forth like tiny pendulums

In a random manner

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

Nitriding of surface

Surface decarburisation

Shot peening

Cold working

28. The steel widely used for motor car crankshafts is

Chrome steel

Nickel steel

Silicon steel

Nickel-chrome steel

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

Six

Eighteen

Twelve

Twenty

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

Ductility

Plasticity

Stiffness

Resilience

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. 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

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

Decrease

Increase

Remain constant

First increase and then decrease

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

Hypoeutectic cast irons

None of these

Eutectic cast irons

Hypereutectic cast irons

35. Which is false statement about properties of aluminium?

Creep strength limits its use to fairly low temperatures

Fatigue strength is not high

Wear resistance is very good

Modulus of elasticity is fairly low

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

Increase wear resistance

Increase endurance strength

Increase hardenability

Reduce machinability

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

Face centered cubic space lattice

Close packed hexagonal space lattice

None of these

Body centered cubic space lattice

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

White cast iron

Malleable cast iron

Alloy cast iron

Nodular cast iron

39. The percentage of carbon in low carbon steel is

0.05%

0.15%

0.3%

0.5%

40. 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 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

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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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