Engineering Materials Practice Set-5

Page 1 of 4

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

Malleable cast iron

White cast iron

Alloy cast iron

Nodular cast iron

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

Concrete

Asbestos cement

Vitrified clay

Cast iron

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

Six

Twelve

Eighteen

Twenty

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

Fatigue

Hot tempering

Creep

Hot hardness

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

Bosh

Throat

Stack

Tyres

6. 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

7. Neutral solution is one which has pH value

Less than 7

pH value has nothing to do with neutral solution

Equal to 7

Greater than 7

8. Brass is an alloy of

None of these

Copper and zinc

Copper, tin and zinc

Copper and tin

9. The elastic stress strain behavior of rubber is

Linear

Plastic

Nonlinear

No fixed relationship

10. Isotropic materials are those which have the same

Elastic properties in all directions

Stresses induced in all directions

Electric and magnetic properties in all directions

Thermal properties in all directions

Page 2 of 4

11. Delta iron occurs at temperature of

Room temperature

Between 1400°C and 1539°C

Above melting point

Between 910°C and 1400°C

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

Increase hardenability

Increase endurance strength

Reduce machinability

Increase wear resistance

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

Endurance

Fatigue

Plastic deformation

Creep

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

Austenite

Pearlite

Cementite

Ferrite

15. Balls for ball bearings are made of

Carbon-chrome steel

Mild steel

Cast iron

Stainless steel

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

Increase

Remain constant

Decrease

First increase and then decrease

17. Mild steel belongs to the following category

High carbon steel

Low carbon steel

Alloy steel

Medium carbon steel

18. The percentage of carbon in low carbon steel is

0.15%

0.05%

0.3%

0.5%

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

Nitriding

Induction hardening

Cyaniding

Electroplating

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

Exists in several crystal forms at different temperatures

Responds to heat treatment

Has a fixed structure under all conditions

Has its atoms distributed in a random pattern

Page 3 of 4

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

Monel metal

Phosphor bronze

Babbitt metal

Nichrome

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

Hypoeutectic cast irons

Eutectic cast irons

Hypereutectic cast irons

None of these

23. Recrystallization temperature is one

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

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

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

Air is burning out silicon and manganese

Silicon and manganese has burnt and carbon has started oxidizing

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

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

Elevated temperatures

Light load and pressure

High pressure and load

Large surface wear

26. White cast iron has

High compressive strength

Carbon in the form of carbide

All of these

Low tensile strength

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

Deformation under stress

Externally applied forces with breakdown or yielding

Fracture due to high impact loads

None of the above

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

Tempering

Annealing

Hot working

Normalizing

29. Malleability of a material can be defined as

Ability to recover its original form

All of the above

Ability to undergo large permanent deformations in compression

Ability to undergo large permanent deformations in tension

30. The steel widely used for motor car crankshafts is

Silicon steel

Nickel steel

Chrome steel

Nickel-chrome steel

Page 4 of 4

31. Following elements have face-centered cubic structure

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

Mg, Zn, Ti, Zr, Br, Cd

All of the above

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

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

Nitriding of surface

Surface decarburisation

Cold working

Shot peening

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

(A) Blackheart cast iron

(B) Whiteheart cast iron

(C) Both (A) and (B)

(D) None of these

34. Which is false statement about properties of aluminium?

Modulus of elasticity is fairly low

Wear resistance is very good

Creep strength limits its use to fairly low temperatures

Fatigue strength is not high

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

Resilience

Plasticity

Stiffness

Ductility

36. 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

37. 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

38. Foundry crucible is made of

Lead

German silver

Graphite

Mild steel

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

None of these

Face centered cubic space lattice

Close packed hexagonal space lattice

Body centered cubic space lattice

40. The molecules in a solid move

In a random manner

In circular motion

Back and forth like tiny pendulums

In a haphazard way

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