Question Bank for Railways NTPC (Technical Ability) Materials Science Materials Science

List-I (Ingredients)		List-II (Welding function)
A.	Silica	1.	Arc stabilizer
B.	Potassium silicate	2.	De-oxidizer
C.	Ferro silicon	3.	Fluxing agent
D.	Cellulose	4.	Gas forming

Codes:

A)

A\[\to \]3, B\[\to \]4, C\[\to \]2, D\[\to \]1

B)

A\[\to \]2, B\[\to \]1, C\[\to \]3, D\[\to \]4

C)

A\[\to \]3, B\[\to \]1, C\[\to \]2, D\[\to \]4

D)

A\[\to \]2, B\[\to \]4, C\[\to \]3, D\[\to \]1

View Solution

4)

A carbon steel having Brinell Hardness number 100 should have ultimate tensile strength closer to:

A)

\[1000\,\,\text{N/m}{{\text{m}}^{\text{2}}}\]

B)

\[200\,\,\text{N/m}{{\text{m}}^{\text{2}}}\]

C)

\[350\,\,\text{N/m}{{\text{m}}^{\text{2}}}\]

D)

\[1000\,\,\text{N/m}{{\text{m}}^{\text{2}}}\]

View Solution

5)

In case carburizing carbon is introduced to form a high carbon layer at the surface. The carbon is introduce in the form of:

A)

Graphite flakes

B)

pearlite

C)

Cementite

D)

free carbon

View Solution

6)

Match the following:

List-I (Alloying element in steel)		List-II (Effect)
A.	Lead	1.	Restricts grain growth
B.	Aluminium	2.	Raises yield point
C.	Copper	3.	Reduces strength to impact
D.	Phosphorus	4.	Free machining

Codes:

A)

A\[\to \]1, B\[\to \]2, C\[\to \]3, D\[\to \]4

B)

A\[\to \]2, B\[\to \]3, C\[\to \]4, D\[\to \]1

C)

A\[\to \]3, B\[\to \]4, C\[\to \]1, D\[\to \]2

D)

A\[\to \]4, B\[\to \]1, C\[\to \]2, D\[\to \]3

View Solution

7)

Presence of hydrogen in steel causes:

A)

Reduced neutron absorption cross-section

B)

Improved weld ability

C)

embrittlement

D)

Corrosion resistance.

View Solution

8)

The main alloying elements in high speed steel in order of increasing proportion:

A)

Vanadium, Chromium, Tungesten

B)

Tungsten, Titanium, Vanadium

C)

Chromium, Titanium, Vanadium

D)

Tungsten, Chromium, Titanium

View Solution

9)

Dye penetrant method is generally used to locate:

A)

Core defects

B)

surface defects

C)

Superficial defects

D)

temporary defects.

View Solution

10)

Herbert cloudburst hardness test is conducted to know:

A)

Uniformity of hardness over a surface

B)

Softness of non-metallic components

C)

Hardness of non-metallic components

D)

Hardness at specified depth inside the surface

View Solution

11)

Which of the following statement is true about brittle fracture?

A)

High temperature and low strain rates favour brittle fracture

B)

Many metal with HCP crystal structure commonly show brittle fracture

C)

Brittle fracture is always preceded by noise

D)

Cup and cone formation is characteristic for brittle materials.

View Solution

12)

Which of the following is a point imperfection

1. Vacancy

2. Interstitially

3. Frenkel imperfection

4. Schottky imperfection

A)

1 and 2 only

B)

2 and 3 only

C)

2, 3 and 4 only

D)

1, 2, 3 and 4

View Solution

13)

Fillers are added to plastics to:

A)

Improve flow

B)

Reduce brittleness

C)

Facilitate processibility

D)

Reduce cost.

View Solution

14)

Quenching is not necessary when hardening is done by:

A)

Case carburizing

B)

Flame hardening

C)

nitriding

D)

Any of the above processes.

View Solution

15)

Specify the sequence correctly:

A)

Grain growth, recrystallization, stress relief

B)

Stress relief, grain growth, recrystallization

C)

Stress relief, recrystallization grain growth

D)

Grain growth, stress relief, recrystallization

View Solution

16)

Small percentage of boron is added to steel to:

A)

Increases hardenability

B)

Reduce machinability

C)

Increases wear resistance

D)

Increase endurance strength.

View Solution

17)

Machine tool frame should have:

A)

High rigidity to weight ratio

B)

Graphite in the form of nodules

C)

Low hardness

D)

High work hardness.

View Solution

18)

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

1. Black-heart cast iron

2. White-heart cast iron

3. Gray cast iron

4. Pig iron

A)

1 and 2 only

B)

3 and 4 only

C)

2 and 4 only

D)

1 and 3 only

View Solution

19)

For the pipe fitting like elbow, tee, union etc. which of the following is preferred?

A)

Pig iron

B)

Malleable iron

C)

Spheroidal graphite cast iron

D)

High carbon steel.

View Solution

20)

Addition of which of the following improves 3 machining of copper?

A)

sulphur

B)

vanadium

C)

Tin

D)

zinc

View Solution

21)

Temperature required for full annealing in hyper- eutectoid steel is:

A)

\[50{}^\circ C\] above upper critical temperature \[(A{{C}_{3}})\]

B)

\[50{}^\circ C\] below upper critical temperature \[(A{{C}_{3}})\]

C)

\[50{}^\circ C\] above lower critical temperature \[(A{{C}_{1}})\]

D)

\[50{}^\circ C\] below lower critical temperature \[(A{{C}_{1}})\]

View Solution

22)

Polyamides are characterized by:

A)

Flexible chain

B)

Rigid chain

C)

amorphous structure

D)

Crystalline structure

View Solution

23)

Which of the following would you prefer for checking the hardness of thin sections?

A)

Hebert cloud burst test

B)

Shore's Seleroscope

C)

Knoop hardness test

D)

Vickers hardness test

View Solution

24)

The percentage of phosphorous in phosphor bronze is:

A)

0.1

B)

1

C)

11.1

D)

98

View Solution

25)

Invar is used or measuring tapes primarily due to its:

A)

Non-magnetic properties

B)

High nickel content

C)

Low coefficient of thermal expansion

D)

Hardenability

View Solution

26)

Which of the following statement is incorrect about duralumin?

A)

It is prone to age hardening

B)

It can he forged

C)

It has good machining properties

D)

It is lighter than pure aluminium.

View Solution

27)

Carriage brass can be:

A)

Cold rolled into sheets

B)

Drawn into wires

C)

Formed into tubes

D)

Any of the above.

View Solution

28)

Induction hardening is basically a:

A)

Carburising process

B)

Surface hardening process

C)

Core-hardening process

D)

None of the above.

View Solution

29)

The microstructure composition of pearlite for and \[F{{e}_{3}}C\] diagram consists of:

A)

Carbon dissolved in alpha iron having a body- centered cubic structure

B)

Carbon dissolved in gama iron having a face- centered cubic structure

C)

A mixture of body-centered alpha iron and face entered gamma iron

D)

Carbon dissolved in body-centered alpha iron and an \[{{F}_{e}}F{{e}_{3}}C.\]

View Solution

30)

Match List-I with List-II and select the correct answer using the codes given be lists:

List-I (Steel type)		List-II (Product)
A.	Mild steel	1.	Screw driver
B.	Tool steel	2.	Commercial beams
C.	Medium carbon steel	3.	Crane hooks
D.	High carbon steel	4.	Blanking dies

Codes:

A)

A\[\to \]1, B\[\to \]4, C\[\to \]3, D\[\to \]4

B)

A\[\to \]2, B\[\to \]4, C\[\to \]4, D\[\to \]1

C)

A\[\to \]1, B\[\to \]3, C\[\to \]1, D\[\to \]2

D)

A\[\to \]2, B\[\to \]1, C\[\to \]2, D\[\to \]3

View Solution

31)

Which of the following statements are true of annealing of steels?

(1) Steels are heated to 500 to \[700{}^\circ C\]

(2) Cooling is done slowly and steadily

(3) Internal stresses are relieved

(4) Ductility of steel is reduced.

Select the correct answer using the codes given below:

A)

2, 3 and 4

B)

1, 3and 4

C)

1, 2 and 4

D)

1, 2 and 3.

View Solution

32)

Duralumin alloy contains aluminium and copper in the ratio of:

A)

% AI	% Cu
94	4

B)

% AI	% Cu
90	8

C)

% AI	% Cu
88	10

D)

% AI	% Cu
86	12

View Solution

33)

Eutectic reaction for iron-carbon system occurs at:

A)

\[600{}^\circ C\]

B)

\[723{}^\circ C\]

C)

\[1147{}^\circ C\]

D)

\[1493{}^\circ C\]

View Solution

34)

The blade of a power saw is made of:

A)

Boron steel

B)

high speed steel

C)

Stainless steel

D)

malleable cast iron

View Solution

35)

Which of the following pairs arc correctly matched?

1. Cellulose nitrate..........Table tenis ball.

2. Phenol furfurol...........Brake linings.

3. Kpoxits ..........Jigs and fixtures.

Select the correct answer using the codes given below:

Codes:

A)

1 and 2

B)

2 and 3

C)

1 and 3

D)

1, 2 and 3

View Solution

36)

Quartz is a:

A)

Ferroelectric material

B)

Ferromagnetic material

C)

Piezoelectric material

D)

Diamagnetic material.

View Solution

37)

Which of the following pairs are correctly matched?

1. Resilience........... resistance to deformation

2. Malleability ............ shape change

3. Creep........... progressive deformation

4. Plasticity.............. permanent deformation

Select the answer using codes given below:

Codes:

A)

2, 3 and 4

B)

1, 2 and 3

C)

1, 2 and 4

D)

1, 3 and 4

View Solution

38)

Consider the following treatments:

Hardness and tensile strength in austenitic stainless steel can be increased by:

A)

1, 2 and 3

B)

1 and 3

C)

2 and 4

D)

4 alone

View Solution

39)

Killed steels:

A)

Have minimum impurity level

B)

Have almost zero percentage of phosphorus and sulphur

C)

Are produced by LD process

D)

Are free from oxygen.

View Solution

40)

Which of following pairs are correctly matched?

1. Silicon steels .......... transformer stamping

2. Duralumin .......... cooking utensils

3. Gun metal.........bearings.

Select the correct answer using the codes given below:

Codes:

A)

1, 2, and 3

B)

1 and 2

C)

1 and 3

D)

2 and 3

View Solution

41)

Which of the following pairs of plastic and their modes of formation are correctly matched?

1. Polythene ............. condensation polymerization

2. Polycarbonate............ addition polymerization

3. Polystyrene .............addition polymerization

4. Polyamide..........either by addition or by condensation polymerization.

Select the correct answer using the codes given below:

Codes:

A)

1 and 2

B)

2 and 4

C)

1 and 4

D)

3 and 4

View Solution

42)

Cubic boron nitride is used:

A)

As lining material in induction furnaces

B)

For making optical quality glass

C)

For heat treatments

D)

as/for none of the above

View Solution

43)

Match List-I (materials) With List-II (applications) and select the correct answer using the codes given below the lists:

List-I		List-II
A.	Engineering ceramics	1.	Bearings
B.	Fiber reinforced	2.	Control plastics rods in nuclear reactors
C.	Synthetic carbon	3.	Aerospace industry
D.	Boron	4.	Electrical insulator

Codes:

A)

A\[\to \]1, B\[\to \]2, C\[\to \]3, D\[\to \]4

B)

A\[\to \]1, B\[\to \]4, C\[\to \]3, D\[\to \]2

C)

A\[\to \]2, B\[\to \]3, C\[\to \]1, D\[\to \]4

D)

A\[\to \]4, B\[\to \]3, C\[\to \]1, D\[\to \]2

View Solution

44)

Which of the following pairs are correctly matched?

1. Lead.......... screw nutphosphor bronze.

2. Piston..........cast iron.

3. Cam..........EN-31 steel.

4. Lead screw..........wrought iron.

Select the correct answer using the codes given below:

A)

2, 3 and 4

B)

1, 3 and 4

C)

1, 2 and 4

D)

1, 2 and 3

View Solution

45)

In low carbon steels, presence of small quantities sulphur improves:

A)

weldability

B)

formability

C)

Machinability

D)

hardenability.

View Solution

46)

Consider the following statements: Addition of silicon to cast iron

1. Promotes graphite module formation.

2. Promotes graphite flake formation.

3. Increases the fluidity of the molten metal.

4. Improves the ductility of cast iron.

Of these statements:

A)

1 and 4 are correct

B)

2 and 3 are correct

C)

1 and 3 are correct

D)

3 and 4 are correct.

View Solution

47)

Match List-I with List-II and select the correct answer using the codes given below the lists:

List-I (Heat treatment)		List-II (Effect on the properties)
A.	Annealing	1.	Refined grain structure
B.	Nitriding	2.	Improves the hardness of the whole mass
C.	Martempering	3.	Increases surface hardness
D.	Normalizing	4.	Improves ductility.

Codes:

A)

A\[\to \]4, B\[\to \]3, C\[\to \]2, D\[\to \]1

B)

A\[\to \]1, B\[\to \]3, C\[\to \]4, D\[\to \]2

C)

A\[\to \]4, B\[\to \]2, C\[\to \]1, D\[\to \]3

D)

A\[\to \]2, B\[\to \]1, C\[\to \]3, D\[\to \]4

View Solution

48)

Eutectoid reaction occurs at:

A)

\[600{}^\circ C\]

B)

\[723{}^\circ C\]

C)

\[114{}^\circ C\]

D)

\[1493{}^\circ C\]

View Solution

49)

Match List-I with List-II and select the correct answer using the codes give below the lists:

List-I (Name of material)		List-II (% carbon range)
A.	Hypo-eutectoid steel	1.	\[4.3\,\,-\,\,5.67\]
B.	Hyper-eutectoid steel	2.	\[2.0\,\,-\,\,4.3\]
C.	Hypo-eutectic cast iron	3.	\[0.8\,\,-\,\,2.0\]
D.	Hyper-eutectic cast iron	4.	\[0.008\,\,-\,\,0.8\]

Codes:

A)

A\[\to \]4, B\[\to \]3, C\[\to \]2, D\[\to \]1

B)

A\[\to \]1, B\[\to \]3, C\[\to \]2, D\[\to \]4

C)

A\[\to \]4, B\[\to \]1, C\[\to \]2, D\[\to \]3

D)

A\[\to \]1, B\[\to \]2, C\[\to \]3, D\[\to \]4

View Solution

50)

Which one of the following sets of constituents is expected in equilibrium cooling of a hypereutectoid steel from austenitic state?

A)

Ferrite and pearlite

B)

Cementite and pearlite

C)

Ferrite and bainite

D)

Cementite and martensite.

View Solution

51)

Match List-I with List-II and select the correct answer using the codes given below the lists:

List-I (Alloy)		List-II (Use)
A.	Low carbon steel	1.	Bearing
B.	Hadfield mangenese steel	2.	Thermocouple
C.	Constantan	3.	Wire nails
D.	Babbit alloy	4.	Bulldozer blades

Codes:

A)

A\[\to \]1, B\[\to \]2, C\[\to \]3, D\[\to \]4

B)

A\[\to \]3, B\[\to \]4, C\[\to \]1, D\[\to \]2

C)

A\[\to \]3, B\[\to \]2, C\[\to \]1, D\[\to \]4

D)

A\[\to \]3, B\[\to \]4, C\[\to \]2, D\[\to \]1

View Solution

52)

The structure of a polymer is shown in the given figure. This polymer finds special application in:

A)

Packaging

B)

adhesives

C)

Bearings

D)

fertilizer

View Solution

53)

Addition of magnesium to cast iron increases its:

A)

Hardness

B)

Ductility and strength in tension

C)

Corrosion resistance

D)

Creep strength.

View Solution

54)

Which one of the following materials will require the largest size of riser for the same casting?

A)

Aluminum

B)

Cast iron

C)

Steel

D)

Copper.

View Solution

55)

Consider the following statements: When a metal or alloy is cold worked:

(1) It is worked below room temperature.

(2) It is worked below recrystallization temperature.

(3) Its hardness and strength increase.

(4) Its hardness increases but strength does

Of these statements:

A)

1 and 4 are correct

B)

1 and 3 are correct

C)

2 and 3 are correct

D)

2 and 4 are correct.

View Solution

56)

Which of the following pairs regarding the effect of alloying elements in steel are correctly matched?

1. Molybdenum: Forms abrasion resisting particles.

2. Phosphorus: Improves machinability in free cutting steels.

3. Cobalt: Contributes to red hardness by hardening ferrite.

4. Silicon: Reduces oxidation resistance.

Select the correct answer using the codes given below:

A)

2, 3 and 4

B)

1, 3 and 4

C)

1, 2 and 4

D)

1, 2 and 3

View Solution

57)

Machine tool guideways are usually hardened by:

A)

Vacuum hardening

B)

Martempering

C)

Induction hardening

D)

Name hardening.

View Solution

58)

18/8 stainless steel contains:

A)

18%, stainless, 8% chromium

B)

18% chromium, 8% nickel

C)

18% tungsten, 8% nickel

D)

18% tungsten, 8% chromium

View Solution

59)

Tin base white metals are used were the bearings are subjected to:

A)

Large surface wear

B)

Elevated temperatures

C)

Light load and pressure

D)

High pressure and load.

View Solution

60)

Alloy steel which is work hardenable and which is used to make the blades of bulldozers, bucket wheel excavators and other earth moving equipment contain iron, carbon and:

A)

Chromium

B)

silicon

C)

Manganese

D)

magnesium.

View Solution

61)

Consider the following statements:

Thermosetting plastics are

1. Formed by addition polymerisation.

2. Formed by condensation polymerisation.

3. Softened on heating and hardened on cooling for any number of times.

4. Moulded by heating and cooling.

Of these statements:

A)

1 and 3 are correct

B)

2 and 4 are correct

C)

1 and 4 are correct

D)

3 and 4 are correct.

View Solution

62)

Match List-I with List-II and select the correct answer

List-I		List-II (Nature of product)
A.	Polyethylene	1.	Adhesive
B.	Polyurethane	2.	Film
C.	Cyano-acrylate	3.	Wire
D.	Nylon	4.	Foam

Codes:

A)

A\[\to \]2, B\[\to \]4, C\[\to \]3, D\[\to \]1

B)

A\[\to \]4, B\[\to \]2, C\[\to \]3, D\[\to \]1

C)

A\[\to \]2, B\[\to \]4, C\[\to \]1, D\[\to \]3

D)

A\[\to \]4, B\[\to \]2, C\[\to \]1, D\[\to \]3

View Solution

63)

Consider the following statements: Fibre reinforced plastics are

1. Made of thermosetting resins and glass fibre.

2. Made of thermoplastic resins and glass fibre.

3. Anisotropic.

4. Isotropic.

Of these statements:

A)

1 and 4 are correct

B)

1 and 3 are correct

C)

2 and 3 are correct

D)

2 and 4 are correct

View Solution

64)

The highest stress that a material can withstand for a specified length of time without excessive deformation is called:

A)

Fatigue strength

B)

Endurance strength

C)

Creep strength

D)

Creep rupture strength

View Solution

65)

Guideways of lathe beds are hardened by

A)

Carburizing

B)

Cyaniding

C)

nitriding

D)

Flame hardening.

View Solution

66)

A given steel test specimen is studied under metallurgical microscope, magnification used is 100 X. In that different phases are observed. One of them is \[F{{e}_{3}}C.\] The observed phase \[F{{e}_{3}}C\] is also known as:

A)

Ferrite

B)

cementite

C)

Austenite

D)

martensite

View Solution

67)

Match List-I with List-II and select the correct answer using the codes given below the lists:

List-I		List-II
A	Toughness	1.	Moment area methode
B.	Endurance strength	2.	Hardness
C.	Resistance to abrasion	3.	Energy absorbed before fracture in a tension test
D.	Deflection in beam	4.	Fatigue loading

Codes:

A)

A\[\to \]4, B\[\to \]3, C\[\to \]1, D\[\to \]2

B)

A\[\to \]4, B\[\to \]3, C\[\to \]2, D\[\to \]1

C)

A\[\to \]3, B\[\to \]4, C\[\to \]2, D\[\to \]1

D)

A\[\to \]3, B\[\to \]4, C\[\to \]1, D\[\to \]2

View Solution

68)

In metals subjected to cold working, strain hardening effect is due to:

A)

Slip mechanism

B)

Twining mechanism

C)

Dislocation mechanism

D)

Fracture mechanism.

View Solution

69)

Match List-I with List-II and select the correct answer using the codes are given below the lists:

List-I		List-II
A.	Neoprene	1.	Electric switches
B.	Bakelite	2.	Adhesive
C.	Foamed polyurethane	3.	Thermal insulator
D.	Araldite	4.	Oil seal

Codes:

A)

A\[\to \]4, B\[\to \]1, C\[\to \]2, D\[\to \]3

B)

A\[\to \]1, B\[\to \]4, C\[\to \]2, D\[\to \]3

C)

A\[\to \]4, B\[\to \]1, C\[\to \]3, D\[\to \]2

D)

A\[\to \]1, B\[\to \]4, C\[\to \]3, D\[\to \]2

View Solution

70)

Which one of the following materials is used for car types as a standard material?

A)

Styrene-butadiene rubber (SBR)

B)

Butyl rubber

C)

Nitrile rubber

D)

Any one of the above depending upon the need

View Solution

71)

Which one of the following refractory materials is recommended for steel furnaces containing CaO stages?

A)

Alumina

B)

Silica

C)

Magnesia

D)

Fireclay

View Solution

72)

Which of the following properties of a solid are dependent on crystal imperfections?

Select the correct answer using the codes given below:

A)

1 and 3

B)

1, 3 and 4

C)

2, 3 and 4

D)

2 and 4

View Solution

73)

Match List-I (Alloying element in steel) with List-II (Property conferred or steel by the element) and select the correct answer using below the lists:

List-I		List-II
A.	Nickel	1.	Corrosion resistance
B.	Chromium	2.	Magnetic permeability
C.	Tungsten	3.	Heat resistance
D.	Silicon	4.	Hardenabiliry

Codes:

A)

A\[\to \]4, B\[\to \]1, C\[\to \]3, D\[\to \]2

B)

A\[\to \]4, B\[\to \]1, C\[\to \]2, D\[\to \]3

C)

A\[\to \]1, B\[\to \]4, C\[\to \]3, D\[\to \]2

D)

A\[\to \]1, B\[\to \]4, C\[\to \]2, D\[\to \]3

View Solution

74)

In the basic EOQ model, if demand is 60 per month ordering costing Rs.12 per order holding cost is Rs.1 per unit per month what is the EOQ?

A)

12

B)

144

C)

24

D)

28

View Solution

75)

Match List-I (Alloys) with List-II (Applications) and select the correct answer using the codes given below the lists:

List-I		List-II
A.	Chromal	1.	Journal bearing
B.	Babbit alloy	2.	Milling cutter
C.	Nimonic alloy	3.	Thermocouple wire
D.	High speed steel	4.	Gas turbine blades

Codes:

A)

A\[\to \]3, B\[\to \]1, C\[\to \]4, D\[\to \]2

B)

A\[\to \]3, B\[\to \]4, C\[\to \]1, D\[\to \]2

C)

A\[\to \]2, B\[\to \]4, C\[\to \]1, D\[\to \]3

D)

A\[\to \]2, B\[\to \]1, C\[\to \]4, D\[\to \]3

View Solution

76)

Which one or the following is correct? In the basis EOQ model, if lead time increases from 5 to 10 days, the EOQ will:

A)

Double

B)

Decrease by a factor of two

C)

Remain the same

D)

The data is insufficient to find EOQ.

View Solution

77)

Match List-I with List-II and select the correct answer using the codes given below the lists:

List-I (Material)		List-II (Structure)
A.	Charcoal	1.	I. F.C.C.
B.	Graphite	2.	H.C.P.
C.	Chromium	3.	Amorphous
D.	Copper	4.	B.CC.

Codes:

A)

A\[\to \]3, B\[\to \]2, C\[\to \]1, D\[\to \]4

B)

A\[\to \]3, B\[\to \]2, C\[\to \]4, D\[\to \]1

C)

A\[\to \]2, B\[\to \]3, C\[\to \]4, D\[\to \]1

D)

A\[\to \]2, B\[\to \]3, C\[\to \]1, D\[\to \]4

View Solution

78)

Consider the following statements: The strength the fibre reinforced plastic product

1. Depends upon the strength of the fibre alone

2. Depends upon the fibre and plastic

3. Is isotropic

4. Is anisotropic.

Which of these statements are correct?

A)

1 and 3

B)

1 and 4

C)

2 and 3

D)

2 and 4

View Solution

79)

Match List-I (Crystal structure) with List-II (atomic packing factor) and select the correct answer using the codes given below the lists:

List-I		List-II
A.	Simple cubic	1.	94%
B.	Body-centred cubic	2.	74%
C.	Face-centred cubic	3.	52%
D.	Hexagonal close packed	4.	68%

Codes:

A)

A\[\to \]3, B\[\to \]4, C\[\to \]2, D\[\to \]1

B)

A\[\to \]4, B\[\to \]3, C\[\to \]2, D\[\to \]1

C)

A\[\to \]3, B\[\to \]4, C\[\to \]1, D\[\to \]2

D)

A\[\to \]4, B\[\to \]3, C\[\to \]1, D\[\to \]2

View Solution

80)

Consider the following pairs of plastics and their distinct characteristics:

1. Acrylics very good transparency to light

2. Polycarbonate poor impact resistance.

3. PTEF low coefficient of friction.

4. Polypropylene excellent fatigue strength-

Which of these statements are correct?

A)

2 and 3

B)

1 and 3

C)

1 and 4

D)

2 and 4.

View Solution

81)

Gibb's phase rule is given by (F = number of degrees of freedom, C = number of components, P = number of phases):

A)

\[F=C+P\]

B)

\[F=C+P\,-\,2\]

C)

\[F=C\,-\,P\,-\,2\]

D)

\[F=C\,-\,P+2\]

View Solution

82)

Which of the following are the benefits inventory control?

1. Improvement in customers relationship.

2. Economy in purchasing

3. Elimination of the possibility of duplicate ordering.

Select the correct answer using the code given below:

A)

1, 2 and 3

B)

1 and 2 only

C)

2 and 3 only

D)

1 and 3 only

View Solution

83)

Match List-I with List-II and select the correct answer using the codes given below the lists:

List-I (Material)		List-II (Applications)
A.	Tungsten carbide	1.	Abrasive wheels
B.	Silicon nitride	2.	Heating elements
C.	Aluminium oxide	3.	Pipes for conveying liquid metals
D.	Silicon carbide	4.	Drawing dies

Codes:

A)

A\[\to \]3, B\[\to \]4, C\[\to \]1, D\[\to \]2

B)

A\[\to \]4, B\[\to \]3, C\[\to \]2, D\[\to \]1

C)

A\[\to \]3, B\[\to \]4, C\[\to \]2, D\[\to \]1

D)

A\[\to \]4, B\[\to \]3, C\[\to \]1, D\[\to \]2

View Solution

84)

Heating the hypo-eutectoid steels to \[30{}^\circ C\] above the upper critical temperature line, soaking at the temperature and then cooling slowly to room temperature to form a pearlite and ferrite structure, is known as;

A)

Hardening

B)

Normalizing

C)

Tempering

D)

Annealing

View Solution

85)

In a eutectic system, two elements are completely:

A)

Insoluble in solid and liquid state

B)

Soluble in liquid state

C)

Soluble in solid state

D)

Insoluble in liquid state.

View Solution

86)

Cast iron is used for machine beds because of its high:

A)

Tensile strength

B)

Endurance strength

C)

Damping capacity

D)

Compressive strength.

View Solution

87)

Cermets are:

A)

Metals for high temperature use with ceramic like properties

B)

Ceramics with metallic strength and luster

C)

Coated tool materials

D)

metal-ceramic composites.

View Solution

88)

Percentages of various alloying elements present in different steel materials are given below:

1. % W ; 4% Cr ; 1% V; 5% Co ; 0.7% C

2. 8% Mo; 4% Cr; 2% V; 6% W; 0.7% C

3. 27% Cr ; 3% Ni; 5% Mo ; 0.25% C

4. 18% Cr ; 8% Ni ; 0.15 C.

Which of these relate to that of high speed steel?

A)

1 and 3

B)

1 and 2

C)

2 and 3

D)

2 and 4

View Solution

89)

Pearlite consists of:

A)

6.67% C and 93.33% ferrite

B)

12% Fe and 87% cementite

C)

13% C and 87% ferrite

D)

13% cementite and 87% ferrite.

View Solution

90)

Addition of vanadium to steel results improvement of:

A)

Heat-treatability by quenching

B)

Hardenability

C)

Fatigue strength

D)

Resistance to oxidation at elevated temperature.

View Solution

91)

Atomic packing factor (APF) in the case of copper crystal is:

A)

0.52

B)

0.68

C)

0.74

D)

1.633

View Solution

92)

During packing solidification, one liquid:

A)

Combines with one solid to form a second new solid

B)

Solidifies into two different solids

C)

Forms one solid

D)

Forms one solid and another liquid.

View Solution

93)

Martensite is a super-saturated solution of carbon in:

A)

Alpha iron

B)

beta iron

C)

Gamma iron

D)

delta iron.

View Solution

94)

The correct sequence of creep deformation in a creep curve in order of their elongation is:

A)

Steady state, transient, accelerated

B)

Transient, steady state, accelerated

C)

Transient, accelerated, steady state

D)

Accelerated, steady state, transient

View Solution

95)

Nodular grey cast iron is obtained from the grey cast iron by adding a small amount of:

A)

Manganese

B)

Phosphorus

C)

Magnesium

D)

Chromium

View Solution

96)

Which one of the following pairs of axis lengths (a, b, c) and interaxial angles \[(\alpha ,\,\beta ,\,\gamma )\] represents the tetragonal crystal system?

A)

\[a=b=c;\,\alpha =\beta =\gamma =90{}^\circ \]

B)

\[a=b\ne c;\,\alpha =\beta =\gamma =90{}^\circ \]

C)

\[a\ne b\ne c;\,\alpha =\beta =\gamma =90{}^\circ \]

D)

\[a=b=c;\,\alpha =\beta =\gamma \ne 90{}^\circ \]

View Solution

97)

Consider the following quenching media:

The correct sequence of these media in order of increasing hardness of steel undergoing heat treatment is:

A)

1, 3, 2, 4

B)

2, 1, 3, 4

C)

1, 2, 3, 4

D)

4, 3, 2, 1

View Solution

98)

Which one of the following pairs is correctly matched?

A)

Solid solution strengthening - Increasing density of dislocations

B)

Dispersion hardening - Creating strained region in the crystal

C)

Strain-hardening - Creating particles to resist the movement of dislocations

D)

Precipitation-hardening - Creating particles by decreasing solubility of one phase in another

View Solution

99)

The alloy steel designated as 40 Cr 18 Ni 2 by Bureau of Indian Standards contains:

A)

0.4% C, 18% Cr and 2% Ni

B)

4.0% C, 1.8% Cr and 0.2% Ni

C)

0.4% C, 1.8% Cr and 0.2% Ni

D)

0.4% C, 1.8% Cr and 0.2 % Ni.

View Solution

100)

Tempering of quenched maritensitic steel is necessary to improve the:

A)

Hardness of the metal

B)

Surface texture of the metal

C)

Corrosion resistance of the metal

D)

Ductility of the metal.

View Solution

101)

The molecular weight of vinyl chloride is 62.5 Thus the molecular weight of a polyvinyl chloride with a degree of polymerisation of 20000 is:

A)

\[\frac{20000}{62.5}\]

B)

\[\frac{62.5}{20000}\]

C)

\[62.5\times 20000\]

D)

20000

View Solution

102)

Carbide-tipped cutting, tools are manufactured by powder-metal technology processes and have a composition of:

A)

Zirconium-Tungsten (35%-65%)

B)

Tungsten carbide-cobalt (90%-10%)

C)

Aluminium oxide-silica (70%-30%)

D)

Nickel-chromium tungsten (30%-15%55%)

View Solution

103)

Match List-I (Name of the element) with List-II (Crystal structure) and select the correct answer using the codes given below the lists:

List-I		List-II
A.	Fluorspar	1.	Body-centered cubic
B.	Alpha-iron	2.	Hexagonal close packed
C.	Silver	3.	Simple cubic
D.	Zinc	4.	Face-centered cubic

Codes:

A)

A\[\to \]3, B\[\to \]2, C\[\to \]4, D\[\to \]1

B)

A\[\to \]4, B\[\to \]1, C\[\to \]3, D\[\to \]2

C)

A\[\to \]4, B\[\to \]2, C\[\to \]3, D\[\to \]1

D)

A\[\to \]3, B\[\to \]1, C\[\to \]4, D\[\to \]2

View Solution

104)

Which of the following factors govern solubility of two non-ferrous metals both inliquid state as well as in solid state?

1. Crystal structure

2. Relative size factor

3. Chemical-affinity factor

4. Relative valence factor

Select the correct answer using the codes giver below:

A)

1, 2 and 3

B)

2, 3 and 4

C)

1 and 4

D)

3 and 4

View Solution

105)

Which of the following are fabricated using| engineering plastics?

(1) Surface plate

(2) Gears

(3) Guide way for machine tools

(4) Foundry patterns.

Select the correct answer using the codes given below:

Codes:

A)

1, 2 and 3

B)

1

C)

2, 3 and 4

D)

1, 2/3 and 4

View Solution

106)

Consider the following statements]

Poly-tetra-fluorothene is

1. A thermoplastic material

2. Having high friction coefficient

3. A thermosetting material

4. Having low friction coefficient

5. An electric insulator

6. Non sticking to surfaces.

Which of the above statements are correct?

A)

1, 2 and 5

B)

2, 3 and 6

C)

3, 4 and 5

D)

3, 2 and 5

View Solution

107)

Which of the following fibre materials are used for reinforcement in composite materials:

1. Glass

2. Boron carbide

3. Graphite

Select the correct answer using the codes given below:

Codes:

A)

1 and 2

B)

1 and 3

C)

2 and 3

D)

1, 2 and 3

View Solution

108)

Match List-I (material) with List-II (application) and select the correct answer using the codes given below the list

List-I (Material)		List-II (Application)
A.	Ceramics chemical	1.	Construction of plants
B.	Refractories	2.	Columns and pillars
C.	Stones	3.	Lining of furnaces
D.	High silica glass	4.	Tiles

Codes:

A)

A\[\to \]4, B\[\to \]3, C\[\to \]2, D\[\to \]1

B)

A\[\to \]2, B\[\to \]1, C\[\to \]4, D\[\to \]3

C)

A\[\to \]4, B\[\to \]1, C\[\to \]2, D\[\to \]3

D)

A\[\to \]2, B\[\to \]3, C\[\to \]4, D\[\to \]1

View Solution

109)

A shop owner with an annual constant demand of 'A' units has ordering costs of Rs. 'P' per order and carrying costs Rs. 'l' T per unit per year. The economic order quantity for a purchasing model having no shortage may be determined from:

A)

\[\sqrt{\frac{24\,P}{Al}}\]

B)

\[\sqrt{\frac{24\,AP}{I}}\]

C)

\[\sqrt{\frac{2\,AP}{I}}\]

D)

\[\sqrt{\frac{2\,AI}{P}}\]

View Solution

110)

A furniture company is maintaining a constant work force which can produce 3000 tables per quarter. The annual demand is 12000 units and is distributed seasonally in accordance with the quarterly indexes \[{{Q}_{1}}=0.80,\] \[{{Q}_{2}}=1.40,\] \[{{Q}_{3}}=1.00\] and \[{{Q}_{4}}=0.80.\] Inventories are accumulated when demand is less than the capacity and are used up during periods of strong demand to supply the total demand. To take into account any seasonal demand the inventories on hand at the beginning of the first quarter should be at least:

A)

0

B)

600

C)

1200

D)

2400

View Solution

111)

Match List-I (Phase diagram) with List-II (Characteristic) and select the correct answer using the codes given below the lists:

List-I (Phase diagram)		List-II (Characteristic)
A.	Isomorphous system	A.	One liquid decomposes into another liquid and solid
B.	Eutectic system	B.	One liquid and another solid combine to form a new solid
C.	Peritectic system	C.	Two metals are corn pletely soluble in liquid state and completely insoluble in solid slate
D.	Monotectic system	D.	Two metals, soluble in solid and liquid state

Codes: