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Engineering Materials
0

Engineering Materials Practice Set-5

May 13, 2021

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Page 1 of 4

1. The elastic stress strain behavior of rubber is

Linear

No fixed relationship

Nonlinear

Plastic

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

Endurance

Fatigue

Creep

Plastic deformation

3. Delta iron occurs at temperature of

Above melting point

Room temperature

Between 910°C and 1400°C

Between 1400°C and 1539°C

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

Large surface wear

Light load and pressure

Elevated temperatures

High pressure and load

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

Electroplating

Nitriding

Cyaniding

Induction hardening

6. Recrystallization temperature is one

At which change of allotropic form takes place

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

At which crystals grow bigger in size

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

7. Closed packed hexagonal space lattice is found in

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

None of the above

Zinc, magnesium, cobalt, cadmium, antimony and bismuth

Alpha-iron, tungsten, chromium and molybdenum

8. Neutral solution is one which has pH value

pH value has nothing to do with neutral solution

Equal to 7

Greater than 7

Less than 7

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

Nitriding of surface

Surface decarburisation

Shot peening

Cold working

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

Tyres

Throat

Bosh

Stack

Page 2 of 4

11. Foundry crucible is made of

German silver

Mild steel

Lead

Graphite

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

Normalizing

Hot working

Tempering

Annealing

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

Six

Twelve

Eighteen

Twenty

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

Pearlite

Austenite

Ferrite

Cementite

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

Responds to heat treatment

Exists in several crystal forms at different temperatures

Has its atoms distributed in a random pattern

Has a fixed structure under all conditions

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

Hot hardness

Hot tempering

Fatigue

Creep

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

Resilience

Plasticity

Stiffness

Ductility

18. The molecules in a solid move

In a random manner

In a haphazard way

Back and forth like tiny pendulums

In circular motion

19. The steel widely used for motor car crankshafts is

Nickel-chrome steel

Chrome steel

Silicon steel

Nickel steel

20. White cast iron has

Carbon in the form of carbide

All of these

High compressive strength

Low tensile strength

Page 3 of 4

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

Vitrified clay

Asbestos cement

Concrete

Cast iron

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

None of these

Hypoeutectic cast irons

Eutectic cast irons

Hypereutectic cast irons

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

Alloy cast iron

White cast iron

Nodular cast iron

Malleable cast iron

24. 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

Silicon and manganese has burnt and carbon has started oxidizing

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

25. Following elements have face-centered cubic structure

Mg, Zn, Ti, Zr, Br, Cd

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

26. Malleability of a material can be defined as

Ability to undergo large permanent deformations in compression

All of the above

Ability to recover its original form

Ability to undergo large permanent deformations in tension

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

Nichrome

Babbitt metal

Phosphor bronze

Monel metal

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

Increase

Decrease

Remain constant

First increase and then decrease

29. 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

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

Reduce machinability

Increase wear resistance

Increase endurance strength

Increase hardenability

Page 4 of 4

31. Which is false statement about properties of aluminium?

Fatigue strength is not high

Modulus of elasticity is fairly low

Wear resistance is very good

Creep strength limits its use to fairly low temperatures

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

Fracture due to high impact loads

None of the above

Deformation under stress

Externally applied forces with breakdown or yielding

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

Close packed hexagonal space lattice

Body centered cubic space lattice

None of these

Face centered cubic space lattice

34. Balls for ball bearings are made of

Cast iron

Stainless steel

Carbon-chrome steel

Mild steel

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

(A) Blackheart cast iron

(C) Both (A) and (B)

(D) None of these

(B) Whiteheart cast iron

36. Brass is an alloy of

Copper and zinc

Copper, tin and zinc

Copper and tin

None of these

37. Isotropic materials are those which have the same

Electric and magnetic properties in all directions

Stresses induced in all directions

Elastic properties in all directions

Thermal properties in all directions

38. Mild steel belongs to the following category

Low carbon steel

High carbon steel

Medium carbon steel

Alloy steel

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

There is no change in grain size

The average grain size is a minimum

The grain size increases very rapidly

The grain size first increases and then decreases very rapidly

40. The percentage of carbon in low carbon steel is

0.3%

0.5%

0.15%

0.05%

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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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