2012 - content.kopykitab.comb) explain the concept of dotted decimal notation of ip address. write...

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Name : ……………………………………………………………

Roll No. : ……………………………………………..…………..

Invigilator's Signature : ………………………………………..

CS/B.TECH(ME/PE)/SEM-8/CS-815/2012

2012

COMPUTER NETWORKING ANDWEB BASED TECHNOLOGY

Time Allotted : 3 Hours Full Marks : 70

The figures in the margin indicate full marks.

Candidates are required to give their answers in their own words asfar as practicable.

GROUP – A

( Multiple Choice Type Questions )

1. Choose the correct alternatives for the following :

10 × 1 = 10i) A search engine resides in the

a) Browser b) Nearest router

c) PC hardware d) Server.

ii) Which of the following classes of IP address is used formulticast addressing ?

a) Class A b) Class B

c) Class C d) Class D.

iii) Cookie is created and sent by

a) Application Server b) Web Server

c) Web Browser d) Database Server.


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iv) Applet is based on the concept of

a) Server Push b) Server Pull

c) Client Push d) Client Pull.

v) HTTP is a protocol of the type

a) Stateless b) Stateful

c) Both (a) and (b) d) None of these.

vi) Which of the following is not used in LAN ?

a) Ethernet b) Token Ring

c) Token Bus d) DQDB.

vii) Which of the following TCP/IP protocols is used for file

transfer with minimal capability and minimal overhead ?

a) FTP b) RARP

c) TETP d) TELNET.

viii) In an optical fibre, the inner core is ................ the

cladding.

a) less dense than b) denser than

c) the same density as d) another name for.

ix) The Hamming code is a method of

a) Error detection b) Error correction

c) Error encapsulation d) both (a) and (b).

x) Connection establishment involves a .............

handshake.

a) one-way b) two-way

c) three-way d) all of these.


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GROUP – B

( Short Answer Type Questions )

Answer any three of the following. 3 × 5 = 15

2. Explain the difference between OSI and TCP/IP model.

3. a) Explain the concept of switching in computer network.

b) Briefly discuss the various types of switching.

1 12 + 3

12

4. a) Briefly explain the different types of guided media.

b) Explain the merits and demerits of unguided media.

2 12 + 2

12

5. a) What is Search Engine ?

b) Explain the technology on which a search engine is

based upon. 2 + 3

6. Java is considered as a language which is based on the

principle of WORA ( Write Once Run Anywhere ). Discuss

this principle in the context of web technology.

GROUP – C

( Long Answer Type Questions )


7. Let a sender is sending a message to a recipient who resides

in a different country. Briefly describe how this message

transmission will be successful with special reference to OSI

model.


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8. a) What are the different classes of IP addressing system

?

b) Explain the concept of dotted decimal notation of IP

address. Write each of the following in dotted decimal

notation :

i) 10011011 11000110 10110100 10001101

ii) 10001100 11100110 10101100 11000110

iii) 10110010 00101101 01001000 00011011

iv) 10001100 11000110 10011011 10001101

v) 01001011 00000001 00110011 10000000

9. Briefly describe the influence of advanced java in web

technology.

10. a) What is DNS and why is it used ?

b) If a DNS domain name is kal.cnn.edu, how many labels

are involved here ?

c) Differentiate between iterative and recursive searching

through the Application Layer.

d) What is three-way handshaking and how is it

performed ?

11. Write short notes on any three of the following : 3 × 5

a) Ethernet

b) LAN and WAN

c) HTTP

d) Packet Switching

e) JVM.

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Name : …………………………………………….……………… Roll No. : …………………………………………...…………….. Invigilator’s Signature : ………………………………………..

CS/B.Tech/ME/SEM-8/ME-823/2013

2013 FRACTURE MECHANICS


The figures in the margin indicate full marks. Candidates are required to give their answers in their own words

as far as practicable.

GROUP – A


1. Choose the correct alternatives for the following :

10 × 1 = 10

i) Method of crack identification is

a) ultrasonic crack detection

b) X-ray

c) magnetic flux method

d) all of these.

ii) More than 80% failures are caused by

a) UDL b) UVL

c) Fluctuating loads d) Point loads.


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iii) Ways of failure are

a) Yielding b) Buckling

c) Fracture d) All of these.

iv) ............. is to measure the potency of a crack for ductile material.

a) G b) K

c) Jc d) CTOD.

v) In mixed mode condition studies are carried out in finding

a) Crack extension direction

b) Critical load

c) Stability of crack path

d) All of these.

vi) Two dimensional problems of fracture mechanics are solved through FEM by using

a) Triangular elements

b) Quadrilateral elements

c) Isoparametric elements

d) All of these.

vii) S-N curve is the relation of

a) Applied stress vs. Number of cycles

b) Stress vs. Strain

c) Number of cycles vs. Applied stress

d) None of these.


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viii) Free energies develop because of

a) Atom is attracted by the neighbouring atoms

b) Atom is repulsed by the neighbouring atoms

c) Atoms close to the surface behave differently from

an atom at the interior

d) All of these.

ix) To minimize stresses a design engineer should modify

a) Notches b) Cutouts

c) Keyways d) None of these.

x) Which one is the field equation ?

a) Equilibrium equations relating stress components

b) Strain-displacement relations

c) Stress-strain relations for the given material of the

component

d) All of these.

GROUP – B

( Short Answer Type Questions )


2. Discuss with neat sketch the Intergranular and Transgranular Fractures.

3. Discuss about three modes of failure with neat sketch.

4. What is the ‘Dilemma of Griffith’ ? Discuss briefly.


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5. Determine energy release rate for an edge crack loaded as shown in the figure below.

6. A large plate of 5 mm thickness, made of medium carbon

steel ( σys = 350 MPa) with a through the thickness centre-

crack of 2a = 40 mm length, is subjected to a stress of 150 MPa. Determine the effective crack length using Irwin’s correction.

GROUP – C

( Long Answer Type Questions ) Answer any three of the following. 3 × 15 = 45 7. a) A steel plate ( σys = 350 MPa) of width 80 mm and

thickness 5 mm has a centre-crack of 2a = 40 mm length. If the far field is 150 MPa, determine SIF and the length of the effective crack using Irwin’s correction. 8

b) Determine J-Integral (Jc) for a component loaded in

mode I with a far field stress of 200 MPa and an edge crack of 40 mm length. The geometrical factors are β2 = 1.12 and H = 7; the material follows Ramberg-Osgood relation with the material constants given as :

E = 207 GPa, n = 6.8 and F = 1 × 1018 (MPa)6.8 7


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8. a) A centre cracked panel of width 2W = 500 mm and

thickness B = 20 mm is pulled normal to the crack

length 2a = 100 mm with a far field stress σ that can be

applied without causing the growth of the crack if

Jp = 400 kJ/m2. The material constants of the

Ramberg-Osgood equation are known to be n = 5, a = 5.4, σ ys ( = σ0) = 520 MPa and ε0 = 0.00251. 8

b) Consider an axially cracked pressured cylinder of steel

(E = 207 GPa) with internal radius of 80 mm and wall

thickness of 16 mm as shown in figure. An axial crack

of 3 mm depth has been identified on the inner surface of the cylinder. If the yield stress σ0 of the material is

700 MPa, hardening exponent n = 7, material constant of Ramberg-Osgood relation α = 6.2 and Jp = 280 J/m2,

determine maximum pressure that the cylinder can

resist against crack growth. 7


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9. a) Find the relation between CTOD, K1 and G1 for small

scale yielding. 8

b) An edge crack, detected on a large plate, is of length 3.1 mm under a constant amplitude cyclic load having σmax = 310 MPa and σmin = 172 MPa. If the plate is made of a ferriate-perlite steel and KIc = 165 MPa m1/2,

determine (a) propagation life up to failure and (b) propagation life if the crack length a is not allowed to exceed 25 mm. 7

10. a) Fluctuating load on a critical component of an offshore structure is shown by a histogram in the figure given below. During a routine check-up, an edge crack of length 1.5 mm is detected. If the crack length is not allowed to exceed 25 mm, determine the remaining life of the component. Use Paris Law with material constants as C = 6.0 × 10-12 (MPa)-3.2 m-0.6 and m = 3.2.

7


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b) Consider the finite plate of figure shown below with a

centre crack of length 2a. Find crack extension direction

and critical condition for crack extension using SED

criterion for −

i) pure mode I loading and

ii) pure mode II loading. The critical stress intensity factor in mode I. Determine experimentally, KIc and

Poisson’s ratio of the material if ν = 0.3. 8

11. Consider an infinite plate with a crack of length 2a = 80 mm,

inclined at angle β with the applied tensile stress σ0 as

shown in figure. KIc of the material is known to be

40 MPa m , elastic constants are E = 200GPa and v = 0.3,

and the plate is subjected to plain strain. (i) Determine initial

crack extension direction using MTS and SED fracture

criteria for β = 60°, (ii) the applied stress σ0 corresponding to

crack initiation using MTS and SED fracture criterion for


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β = 60°, and (iii) relations θc vs. β and σ0 vs. β for both

fracture criteria for β varying between 10° and 90°.

βσ=σ′ 2

11 cos ββσ=τ′ cossin212

βσ=σ′ 222 cos

8372 [ Turn over

Name : ……………………………………………………………

Roll No. : ……………………………………………..…………..

Invigilator's Signature : ………………………………………..

CS/B.TECH(ME)/SEM-8/ME-822/2012

2012MECHANICS OF COMPOSITE MATERIALS


The figures in the margin indicate full marks.

Candidates are required to give their answers in their own words asfar as practicable.

GROUP – A


1. Choose the correct alternatives for any ten of the following :

10 × 1 = 10i) Fibre reinforced plastics are used in

a) Automobile tyres b) Lenses

c) Aircraft d) Electric switch cover.

ii) Wood is a natural composite consiting of which of thefollowing ?

a) Lignin fibres in collagen matrix

b) Ligning fibres in apatite matrix

c) Cellulose fibres in apatite matrix

d) Cellulose fibres in lignin matrix.

iii) Which one of the following is not a ceramic ?

a) Alumina b) Porcelain

c) Whisker d) Pyrosil.

CS/B.TECH(ME)/SEM-8/ME-822/2012

8372 2

iv) In case of rubber, vulcanization refers to the process of

producing a

a) linear polymer b) branched polymer

c) cross-linked polymer d) network polymer.

v) Kevlar 49 is an example of

a) fibre material

b) matrix material

c) low strength composite material

d) high strength composite material.

vi) Epoxy is an example of

a) fibre b) matrix

c) composite d) none of these.

vii) The proper form of Halpin-Tsai equation is

a)E tE m

= 1 + ξ ηV f 1 – η V f

b)E mE t

= 1 + ξ ηV f 1 – ηV f

c)E tE m

= 1 + ξ ηV c 1 – ηV c

d)E tE m

= E fE m

1 – η V f

viii) Which of the following fibre materials are used for

reinforcement in composite materials ?

a) Glass b) Boron carbide

c) Graphite d) All of these.

ix) Choose the correct statement regarding composite

material :

a) Material is termed as advanced composite, if fibres

are directionally oriented and continuous

b) Reinforced fibre glass products are strong and

light weight

c) Pearlitic steels are composite material

d) All of these.

WBUT Mechanical Engineering 8thSemester Previous Year Question Paper

Publisher : Faculty Notes Author : Panel Of Experts

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