Engineering Materials Practice Set-5

Page 1 of 4

1. Mild steel belongs to the following category

Low carbon steel

Alloy steel

High carbon steel

Medium carbon steel

2. The molecules in a solid move

In a random manner

In a haphazard way

Back and forth like tiny pendulums

In circular motion

3. In full annealing, the hypo eutectoid steel is heated from 30°C to 50°C above the upper critical temperature and then cooled

Suddenly in a suitable cooling medium

Slowly in the furnace

In still air

Any one of these

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

Eutectic cast irons

None of these

Hypoeutectic cast irons

Hypereutectic cast irons

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

First increase and then decrease

Decrease

Remain constant

Increase

6. Recrystallization temperature is one

At which crystals grow bigger in size

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

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

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

Eighteen

Twenty

Six

Twelve

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

Vitrified clay

Asbestos cement

Cast iron

Concrete

9. Malleability of a material can be defined as

Ability to undergo large permanent deformations in compression

Ability to undergo large permanent deformations in tension

Ability to recover its original form

All of the above

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

Malleable cast iron

White cast iron

Nodular cast iron

Alloy cast iron

Page 2 of 4

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

(D) None of these

(A) Blackheart cast iron

(C) Both (A) and (B)

(B) Whiteheart cast iron

12. 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

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

Resilience

Plasticity

Ductility

Stiffness

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

Monel metal

Babbitt metal

Nichrome

Phosphor bronze

15. 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

16. 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

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

Fatigue

Hot hardness

Hot tempering

Creep

18. 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

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

Tyres

Bosh

Stack

Throat

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

Nitriding of surface

Surface decarburisation

Shot peening

Cold working

Page 3 of 4

21. Balls for ball bearings are made of

Cast iron

Stainless steel

Carbon-chrome steel

Mild steel

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

Increase hardenability

Reduce machinability

Increase endurance strength

Increase wear resistance

23. Neutral solution is one which has pH value

Equal to 7

Less than 7

Greater than 7

pH value has nothing to do with neutral solution

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

The grain size increases very rapidly

The average grain size is a minimum

The grain size first increases and then decreases very rapidly

There is no change in grain size

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

Has its atoms distributed in a random pattern

Responds to heat treatment

Has a fixed structure under all conditions

Exists in several crystal forms at different temperatures

26. Brass is an alloy of

None of these

Copper, tin and zinc

Copper and zinc

Copper and tin

27. 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

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

All of the above

28. Isotropic materials are those which have the same

Stresses induced in all directions

Elastic properties in all directions

Electric and magnetic properties in all directions

Thermal properties in all directions

29. The percentage of carbon in low carbon steel is

0.3%

0.05%

0.5%

0.15%

30. The steel widely used for motor car crankshafts is

Nickel steel

Nickel-chrome steel

Chrome steel

Silicon steel

Page 4 of 4

31. White cast iron has

All of these

High compressive strength

Carbon in the form of carbide

Low tensile strength

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

Cyaniding

Electroplating

Induction hardening

Nitriding

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

Normalizing

Annealing

Hot working

Tempering

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

None of these

Close packed hexagonal space lattice

Body centered cubic space lattice

Face centered cubic space lattice

35. The elastic stress strain behavior of rubber is

Plastic

No fixed relationship

Linear

Nonlinear

36. Which is false statement about properties of aluminium?

Modulus of elasticity is fairly low

Fatigue strength is not high

Creep strength limits its use to fairly low temperatures

Wear resistance is very good

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

Cementite

Ferrite

Austenite

Pearlite

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

Plastic deformation

Fatigue

Endurance

Creep

39. Foundry crucible is made of

Graphite

German silver

Lead

Mild steel

40. Delta iron occurs at temperature of

Between 1400°C and 1539°C

Above melting point

Room temperature

Between 910°C and 1400°C

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