metallurgy question bank quize metals 1

8/8/2019 Metallurgy Question Bank Quize Metals 1

1/8

1. Write a short note on

(a) Nucleation and growth

(b) Micro segregation and macro segregation

(c) Homogeneous and Heterogeneous nucleation

(d) Directional solidification. [4+4+4+4]

2. (a) Why is an octahedral void called Octahedral?

(b) Draw a unit cell of FCC and also show atleast one octahedral void in it. How

many such voids are present in it?

(c) Draw a unit cell of BCC and show atleast one octahedral void in it. How

many such voids are present in it?

(d) Draw a unit cell of HCP. Show one of the octahedral holes in it. How many

octahedral holes are present in it? [4+4+4+4]

3. Duralumin alloy rivets used in aircraft construction are kept at -400C after solution

treatment. Whenever required they are taken out and riveted on the spot. Explain

the reason for keeping them at -400C and also explain how rivets operation at room

temperature strengthen the rivets? [16]

4. (a) Give the classification of stainless steels?

(b) Explain each type of steel with chemical composition, microstructure, proper-

ties and applications? [4+12]

5. (a) What is Martensite? Distinguish between Lath Martensite and Accicular

martensite.

(b) Discuss briefly Nitriding of steels. [8+8]

6. Discuss the following alloys:

(a) Cupronickels

(b) Beryllium Bronzes. [8+8]7. (a) Compare the properties of crystalline ceramics and glass ceramics.

(b) Why annealing and tempering operations are performed on glass? Describe.

8. (a) What is the role of matrix in a composite material? Discuss various types

matrix materials.

(b) Indicate any one important metal matrix composite and mention its charac-

teristics, properties and applications.

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1. (a) Define grain and grain boundary? How does the presence of grain boundary

affect the physical and mechanical properties of metals?

(b) What is the effect of heating rate and cooling rate of steel on grain growth

and properties of steel?( Consider heating to Austenite zone and cooling from

the same zone)? [8+8]

2. (a) What are intermediate phases? Discuss various types of intermediate phases?

(b) What is the importance of ratio of radius of interstitial to solvent atom in
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interstitial compounds? [8+8]

3. (a) Discuss the effect of alloying elements in Fe-Fe3C diagram?

(b) Discuss the effect of carbon on

i. Mechanical properties

ii. Grain size. [8+8]

4. (a) Give the heat treatment and applications for the following steels

i. Austenitic stainless steels

ii. Martensitic stainless steels

iii. Ferritic stainless steels

iv. Precipitation hardening stainless steels.

(b) Explain each type of steel with chemical composition, microstructure, proper-

ties and applications? [16]

5. (a) What is the difference between Iron-Cementite and Iron-graphite phase dia-

gram?

(b) Draw T-T-T diagram for a eutectoid steel and explain the effect of cooling

rate on the transformation products and hardness obtained. [6+10]

6. (a) Differentiate between oxygen free high conductivity copper and electrolytic

tough pitch copper. Indicate their relative conductivities.

(b) For any three important brasses, give composition, treatment, structure, prop-

erties and applications. [4+12]

7. Discuss the effect of the following factors on mechanical behaviour of ceramic ma-

terials:

(a) grain size and shape

(b) Purity and

(c) Porosity [8+4+4]8. (a) What are laminates? Indicate their characteristics.

(b) Compare and contrast carbon matrices with glass matrices.

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1. (a) Define crystallization of metal? How is that commercial alloy invariably so-

lidify with heterogeneous nucleation?

(b) What factor favours the formation of fine grained material? How is a large

single crystal being produced? [8+8]

2. (a) Discuss in detail the necessity of alloying with few examples.

(b) Explain how are alloys actually made in industry? [8+8]

3. (a) Define cast irons ? Explain the cooling history of 4.3% C in Fe-Fe3C system

by drawing cooling curve?

(b) Calculate proportionate of different phases for 2.8%C in Fe-Fe3C diagram at

12000C, 11730C, and 6000C. Also draw the microstructures at room tempera-

ture? [6+10]
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4. (a) Why stainless steels are stainless?

(b) Is it possible to harden 18%Cr-8%Ni steels by heat treatment?

(c) Why Austenitic stainless steels prone to welddecay? How can you avoid weld

decay? [2+7+7]

5. (a) Distinguish between hardness and hardenability.

(b) Critically discuss Pack carburizing of steels. [5+11]

6. (a) What are light metals? Explain the important characteristics of aluminium

and its alloys.

(b) Describe alloy and temper designation of Al and its alloys. [8+8]

7. (a) Calculate the density of FeO which has an NaCl-type structure. (assume

stoichiometry). Radius of Iron is 0.74A0 & oxygen is 1.40 A0.

(b) Discuss briefly the structure, properties and uses of Al2O3. [6+10]

8. (a) Explain how to improve damping ability of a composite.

(b) Compare and contrast whisker and particulate reinforced composites

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1. (a) What is the importance of grain size in steel? How do you determine grain

size of the given steel?

(b) Explain why grains are stronger than grain boundaries at high temperature

and grain boundaries are stronger than grains at room temperatures? [8+8]

2. (a) Distinguish between commercially pure metal and an alloy?

(b) What is a master alloy? What are its chief characteristics?

(c) Justify the statement Alloy is a material which is expected of a metal, but

it is not a pure metallic element. [6+6+4]

3. (a) Name possible types of Cementite in Fe-Fe3C diagram? Explain why proeu-

tectiod product forms at grain boundaries of austenite ?

(b) Differentiate between

i. Proeutectiod ferrite and eutectoid ferrite

ii. Hypoeutectic and Hyper eutectic white cast iron. [8+8]

4. What are four basic types of cast Irons? Explain them with respect to properties,

microstructure with a diagram and applications? [16]

5. (a) What is an alloy? Give two examples.

(b) Discuss in detail the effect of alloying elements in steels.

[4+12]

6. (a) Alpha brasses are cold worked while Alpha-Beta brasses are hot worked. Ex-

plain.

(b) Extensive coring occurs in cast bronzes compared to cast brasses. Give rea-

sons.

(c) What is dezincification? What are its effects? How is it prevented? [7+4+5]
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7. (a) In a heterogeneous multiphase refractory, what are the microstructural fea-

tures present? Mention their applications.

(b) Why chemically synthesized magnesium-aluminate spinel is used exclusively

as refractory in molten salt electrolysis cell for producing magnesium? [10+6]

8. (a) What is aspect ratio? Why is it so important?

(b) Discuss briefly about whisker reinforced composites?

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The ratio of the lateral strain to linear strain is called the Engineering Metallurgy

Deflection of a cantilever beam under load on doubling itswidth will _________ the deflection.

Engineering Metallurgy

A cantilever beam subjected to several concentrated loads

has maximum ...Engineering Metallurgy

Which one has the maximum capillary rise relative to

mercury?Engineering Metallurgy

Hydraulic controllers are used to control upto a distance of

_________ metres.Engineering Metallurgy

Pneumatic control valves are generally designed for pressureupto ________ kg/cm


Which of the following factors does not influence the

measurement accuracy?Engineering Metallurgy

Thermit welding is a form of _______ welding. Engineering Metallurgy

When welding is in progress, the arc voltage range is

________ volts.Engineering Metallurgy

Filter material need not be necessarily used in case of Engineering Metallurgy

The oxidising flame mixes the oxygen and acetelene in theratio of


TIG is especially useful in welding Engineering Metallurgy

Most weldable of the following steels is the Engineering Metallurgy

The normal defects, which occur in a welding joint are Engineering Metallurgy

Refractoriness of a typical silica brick corresponds to segercone number 32, which is equivalent to a temperature of

________ C


With increase in the alumina content in fire bricks, its fusion Engineering Metallurgy
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point (refractoriness)

In panel test for spalling resistance, the average face

temperature of panel assembly is maintained at _______C

for 24hours.


Fireclay bricks are not used in the Engineering Metallurgy

Air infiltration in a furnace Engineering Metallurgy

Ceramic recuperators compared to metallic recuperators for

the same dutyEngineering Metallurgy

The thermal efficiency of a steel slab reheating furnace(pusher type) may be about _________ percent.


The reason for excessive clinker formation in gas producers

is theEngineering Metallurgy

Higher ash in coal for metallurgical coal making Engineering Metallurgy

Which is not a manufactured fuel? Engineering Metallurgy

Caking index of coal is a measure of its Engineering Metallurgy

Swelling index of coal is a measure of its Engineering Metallurgy

Thorium can be converted into U-233 in a _______ reactor. Engineering Metallurgy

Which of the following does not need a moderator? Engineering Metallurgy

U-235 content in enriched that is normally used in power

reactors (e.g. at Tarapur Atomic Power Plant) is about

_______ percent.


Liquid metal (e.g. molten sodium) is preferred as a coolantin case of a/an _________ reactor.


With increase in size of grains, the Engineering Metallurgy

A system is called non-variant system, if the degree of

freedom is zero. This system (consisting of ice, water and

steam) at triple point is


Electrons can move through lattice, only when the ________is satisfied as per free electron theory.


__________ states that "no two electrons in an atom are in

the same energy state as defined by four quantum numbers."Engineering Metallurgy

Bell metal comprises of __________ Engineering Metallurgy

Machining properties of steel as improved by adding Engineering Metallurgy
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Presence of nitrogen in steel ... Engineering Metallurgy

Zircalloy used as a fuel cladding material in a nuclear

reactor (thermal) is an alloy of zirconium and which of the

following?


Which of the following defects in metal does not get weldedup during its hot working


Machanical working of metals does NOT change its Engineering Metallurgy

Stress relief annealing of cold worked matals Engineering Metallurgy

Bauschinger effect is Engineering Metallurgy

Refractory lining life in Kaldo Vessel is about ______ heats. Engineering Metallurgy

For de-phosphorisation in LD process the slag should be Engineering Metallurgy

Alloying elements in steel which tend to stabilise austeniteare


Metallic yield of steel during steel making in Indian steel

plant is about _____ percentage.Engineering Metallurgy

In one day of normal Blast Furnace operation, maximum

tonnage of ________ is produced.Engineering Metallurgy

A blast furnace operating with high top pressure has higher Engineering Metallurgy

Which of the following factors does not favour de-

sulphurisation in the blast furnace


Basicity of acidic sinter is Engineering Metallurgy

Question Subject Category

Cinnabar is an important ore of Engineering Metallurgy

During extraction of zinc from its ore, smelting operation is

carried out in aEngineering Metallurgy

Iron ________ is the most predominant conponent in slagproduced in the pyro-metallurgical process for the extraction

of copper from its sulphide ore


The product of calcination of Aluminium trihydrate at

1100C isEngineering Metallurgy

In which of the following surface hardening process of steel, Engineering Metallurgy
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7/8

change in chemistry of the steel surface takes place?

Which of the following is the most common and convenient

method for determination of harden-ability?Engineering Metallurgy

Internal Stresses in a body do not develop during Engineering Metallurgy

What is the menting point(C) of pure silica sand

SiO2(99.8%)?Engineering Metallurgy

Which of the following surface hardening treatment

increases the carbon content in the surface of material?Engineering Metallurgy

In malleable Iron, carbon is in the form of graphite _____. Engineering Metallurgy

Which of the following is a NDT technique used forcastings?


Choose a correct statement among the following: Engineering Metallurgy

Which of the following has the lowest prandtl number? Engineering Metallurgy

Latent heat absorbed by 1lb of water at 212 when it is

changed to steam at the same temperature may be around

_______ BTU.


Which of the following is the most widely used heatinsulating material for pipelines carrying stream?


Water always boils, when its Engineering Metallurgy

The equivalent diameter for fluid flow through square cross-section channel of the side 'x', for pressure drop calculation

purpose is given by


The reactions in a bem supported on rollers will be

__________ to the axis.Engineering Metallurgy

The ratio of the average fluid velocity to the maximumvelocity in case of laminar flow of the Newtonian fluid in a

circular pipe is _______.


Prandtl mixing Length is Engineering Metallurgy

The rate of gaseous phase reaction is given by K.Ca.Cb. Ifthe volume of the vessel is reduced to 1/4th of its initialvolume, then the reaction rate compared to the original rate

will be ________ times.


What is the unit of rate constant in a chemical reaction in

which 10% of the reactant decomposes in 1 hour, 20% in

two hours, 30% in three hours and so on?

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8/8

The unit of frequency factor in Arrhenius equation Engineering Metallurgy

B.E.T. method can be used to determine __________ of the

porous catalyst.Engineering Metallurgy
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metallurgy question bank quize metals 1

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