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Engineering Materials
0

Engineering Materials Practice Set-5

May 13, 2021

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Page 1 of 4

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

Elevated temperatures

High pressure and load

Light load and pressure

Large surface wear

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

The grain size increases very rapidly

The grain size first increases and then decreases very rapidly

The average grain size is a minimum

There is no change in grain size

3. White cast iron has

Low tensile strength

All of these

Carbon in the form of carbide

High compressive strength

4. 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

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

Twenty

Six

Twelve

Eighteen

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

(B) Whiteheart cast iron

(C) Both (A) and (B)

(A) Blackheart cast iron

(D) None of these

7. The elastic stress strain behavior of rubber is

Nonlinear

Linear

Plastic

No fixed relationship

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

Cyaniding

Induction hardening

Electroplating

Nitriding

9. 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

10. The steel widely used for motor car crankshafts is

Chrome steel

Nickel steel

Silicon steel

Nickel-chrome steel

Page 2 of 4

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

Bosh

Stack

Tyres

Throat

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

Externally applied forces with breakdown or yielding

None of the above

Fracture due to high impact loads

Deformation under stress

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

Eutectic cast irons

None of these

Hypereutectic cast irons

Hypoeutectic cast irons

14. Isotropic materials are those which have the same

Stresses induced in all directions

Electric and magnetic properties in all directions

Elastic properties in all directions

Thermal properties in all directions

15. 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

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

Air is burning out silicon and manganese

Silicon and manganese has burnt and carbon has started oxidizing

16. Balls for ball bearings are made of

Stainless steel

Cast iron

Mild steel

Carbon-chrome steel

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

Shot peening

Cold working

Surface decarburisation

Nitriding of surface

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

Increase wear resistance

Increase endurance strength

Reduce machinability

Increase hardenability

19. Recrystallization temperature is one

At which crystals grow bigger in size

At which change of allotropic form takes place

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

20. Brass is an alloy of

Copper and zinc

Copper and tin

Copper, tin and zinc

None of these

Page 3 of 4

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

None of these

Body centered cubic space lattice

Close packed hexagonal space lattice

Face centered cubic space lattice

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

Endurance

Creep

Plastic deformation

Fatigue

23. Which is false statement about properties of aluminium?

Wear resistance is very good

Modulus of elasticity is fairly low

Fatigue strength is not high

Creep strength limits its use to fairly low temperatures

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

Concrete

Asbestos cement

Cast iron

Vitrified clay

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

First increase and then decrease

Remain constant

Decrease

Increase

26. Foundry crucible is made of

Graphite

Lead

Mild steel

German silver

27. Mild steel belongs to the following category

Low carbon steel

High carbon steel

Medium carbon steel

Alloy steel

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

Exists in several crystal forms at different temperatures

Has its atoms distributed in a random pattern

Responds to heat treatment

Has a fixed structure under all conditions

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

Hot hardness

Fatigue

Hot tempering

Creep

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

Cementite

Austenite

Pearlite

Ferrite

Page 4 of 4

31. Closed packed hexagonal space lattice is found in

None of the above

Alpha-iron, tungsten, chromium and molybdenum

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

Zinc, magnesium, cobalt, cadmium, antimony and bismuth

32. Neutral solution is one which has pH value

pH value has nothing to do with neutral solution

Greater than 7

Equal to 7

Less than 7

33. The molecules in a solid move

Back and forth like tiny pendulums

In circular motion

In a random manner

In a haphazard way

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

Tempering

Normalizing

Annealing

Hot working

35. Following elements have face-centered cubic structure

Mg, Zn, Ti, Zr, Br, Cd

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

All of the above

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

36. 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

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

Ductility

Stiffness

Plasticity

Resilience

38. The percentage of carbon in low carbon steel is

0.5%

0.05%

0.3%

0.15%

39. Malleability of a material can be defined as

All of the above

Ability to undergo large permanent deformations in compression

Ability to undergo large permanent deformations in tension

Ability to recover its original form

40. Delta iron occurs at temperature of

Between 1400°C and 1539°C

Above melting point

Between 910°C and 1400°C

Room temperature

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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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