Engineering Materials Practice Set-5

Page 1 of 4

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

Fatigue

Plastic deformation

Endurance

Creep

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

Tyres

Throat

Stack

Bosh

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

(C) Both (A) and (B)

(B) Whiteheart cast iron

(A) Blackheart cast iron

(D) None of these

4. White cast iron has

Carbon in the form of carbide

High compressive strength

All of these

Low tensile strength

5. Following elements have face-centered cubic structure

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

Mg, Zn, Ti, Zr, Br, Cd

6. 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

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

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

Air is burning out silicon and manganese

8. 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

9. Which is false statement about properties of aluminium?

Modulus of elasticity is fairly low

Fatigue strength is not high

Wear resistance is very good

Creep strength limits its use to fairly low temperatures

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

Normalizing

Tempering

Annealing

Hot working

Page 2 of 4

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

Fracture due to high impact loads

Externally applied forces with breakdown or yielding

Deformation under stress

None of the above

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

Resilience

Stiffness

Ductility

Plasticity

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

Nitriding of surface

Shot peening

Cold working

Surface decarburisation

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

Fatigue

Hot tempering

Creep

Hot hardness

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

Cast iron

Concrete

Vitrified clay

Asbestos cement

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

Monel metal

Nichrome

Phosphor bronze

Babbitt metal

17. Delta iron occurs at temperature of

Between 910°C and 1400°C

Above melting point

Between 1400°C and 1539°C

Room temperature

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

Alloy cast iron

Nodular cast iron

Malleable cast iron

White cast iron

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

Ferrite

Austenite

Cementite

Pearlite

20. Mild steel belongs to the following category

Alloy steel

Medium carbon steel

High carbon steel

Low carbon steel

Page 3 of 4

21. The elastic stress strain behavior of rubber is

Linear

No fixed relationship

Plastic

Nonlinear

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

Responds to heat treatment

Has its atoms distributed in a random pattern

Exists in several crystal forms at different temperatures

Has a fixed structure under all conditions

23. Recrystallization temperature is one

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

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

24. 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

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

There is no change in grain size

The grain size increases very rapidly

The average grain size is a minimum

The grain size first increases and then decreases very rapidly

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

None of these

Eutectic cast irons

Hypereutectic cast irons

Hypoeutectic cast irons

27. Brass is an alloy of

Copper and zinc

Copper and tin

None of these

Copper, tin and zinc

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

Increase wear resistance

Increase hardenability

Reduce machinability

Increase endurance strength

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

Cyaniding

Induction hardening

Electroplating

Nitriding

30. The molecules in a solid move

In a random manner

In a haphazard way

In circular motion

Back and forth like tiny pendulums

Page 4 of 4

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

Body centered cubic space lattice

None of these

Close packed hexagonal space lattice

Face centered cubic space lattice

32. Foundry crucible is made of

Mild steel

German silver

Lead

Graphite

33. The steel widely used for motor car crankshafts is

Nickel-chrome steel

Chrome steel

Silicon steel

Nickel steel

34. 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

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

Elevated temperatures

Large surface wear

Light load and pressure

High pressure and load

36. Balls for ball bearings are made of

Carbon-chrome steel

Stainless steel

Mild steel

Cast iron

37. The percentage of carbon in low carbon steel is

0.3%

0.5%

0.05%

0.15%

38. 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

39. Neutral solution is one which has pH value

pH value has nothing to do with neutral solution

Equal to 7

Less than 7

Greater than 7

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

Eighteen

Twenty

Twelve

Six

Engineering Materials Practice Set-5

Related

Leave a ReplyCancel reply

Secured Payments

Protection

Engineering Materials Practice Set-5

Share this Now with Friends:

Related

Leave a ReplyCancel reply

Secured Payments

Protection