Gujarat Technological University 2009 B.E Aeronautical Engineering - Question Paper

AERONAUTICAL ENGINEERING Semester-I

Seat No.:__Enrolment No._

(CH-1)

GUJARAT TECHNOLOGICAL UNIVERSITY

B.E. all Sem-I Examination December 08/January 09 Chemistry (110001)

DATE: 26-12-2008, Friday TIME: 12.00 to 2.30 p.m.    MAX. MARKS: 70

Instructions:

1.    Attempt all questions.

2.    Make suitable assumptions wherever necessary.

3.    Figures to the right indicate full marks.

Q.1.

(a)    What is meant by softening of water?    07 With a neat schematic diagram, describe any one industrial method of softening of water.

(b)    What is biogas? Explain the manufacture of biogas from animal (cow) dung. 04 Giving two illustrations for each bring out the differences between

(c)    thermoplastics and thermosetting plastics.    03

Q.2.

(a)    With a neat diagram of fractional distillation column, discuss about refining 07 of crude oil.

(b)    Explain break point chlorination. What are its advantages?    03

OR

(b)    What is the principle of reverse osmosis? How is it used for desalination? 03

(c)    A sample of water, on analysis, was found to contain the following 04 impurities in mg/L: Ca(HCO₃)₂ = 32.4; Mg(HCO₃)₂ = 14.6; CaSO₄ = 27.2; MgSO₄ = 30.0; CaCl₂ = 11.1. Calculate the temporary hardness and the permanent harness of water. Given: Molecular weight of Ca(HCO₃)₂ = 162; Mg(HCO3)2 = 146; CaSO4 = 136; MgSO4 = 120; CaCh = 111.

OR

(c) Calculate the amount of lime and soda required to soften 20,000 liters of 04 water having the following analysis:

Ca(HCO₃)₂ = 40.5 ppm; Mg(HCO₃)₂ = 36.5 ppm; CaSO₄ = 34.0 ppm; MgSO₄ = 30.0 ppm; CaCl₂ = 27.75 ppm; NaCl = 5.85 ppm.

Q.3.(a) What are the raw materials required for manufacturing cement?

With a neat diagram of rotary kiln, describe how Portland cement is 06 manufactured by wet process.

(b)    Why does natural rubber need vulcanization? Discuss the process of 04 vulcanization in brief.

(c)    With a schematic diagram, describe the process of melt spinning of fibres. 04

OR

Q.3.

(a)    State ISI specification of cements. Discuss about setting and hardening of 06 Portland cement with the sequence of chemical reactions involved in it.

(b)    Mention the compounding materials used in plastics and indicate their 04 functions.

(c) Explain the following terms and their effects on the environment:    04

(i) Green house effect; (ii) Ozone depletion.

What are the purposes of alloy making? Illustrate with suitable examples. 06 Name two non-ferrous alloys and their applications

Give the factors responsible for corrosion of a boiler. Discuss the measures 04 for its prevention.

What is cathodic protection? With an illustration, explain sacrificial anode method of controlling corrosion.    04

OR

What is the function of carbon in steel?    06

Discuss the following methods of heat treatment of steel and their effects on alloys: (i) Annealing; (ii) Hardening; (iii) Tempering.

Define the term lubricant.    04

Explain the following properties of lubricants and their significance.

(i) Viscosity; (ii) Flash point.

Distinguish between paint and varnish.    0 4

Mention the essential constituents of paint and their functions.

State the conditions favourable for fermentation.    06

Cite two industrial fermentation processes in which enzymes are used and discuss about them in brief.

(b)    What are the characteristics of a good fuel?    04 Why is compressed natural gas (CNG) preferred over liquefied petroleum

gas (LPG)?

(c)    One gram of an air-dried coal sample was weighed in a silica crucible. After 04 heating for 1 hour at 105-110C, the dry coal weighed 0.980 g. The crucible

was covered with lid and then heated strongly for exactly 7 minutes at 950

20C. The residue weighed 0.750 g. The crucible was then heated strongly in air, until a constant weight was obtained. The residue was found to weigh

0.100 g. Give the proximate analysis of coal.

OR

Q.5.

(a)    Differentiate between scale and sludge.    06 How does the formation of sludge and scales affect boiler performance?

Give a method of prevention of scales.

(b)    Discuss about the environmental problems due to over utilization of natural 04 sources.

(c)    One gram of accurately weighed coal sample was burnt in a current of 04 oxygen in a combustion apparatus. Carbon and hydrogen of the coal sample were converted into CO2 and H2O respectively, which were then absorbed respectively in KOH and CaCl₂ tubes of known weight. The increase in the weight of KOH tube was 3.0 g and the increase in weight of CaCl₂ tube was

0.9 g. Find the percentage of carbon and hydrogen.

2

(C-2)

GUJARAT TECHNOLOGICAL UNIVERSITY

B.E. all Sem-I Examination December 08/January 09

Seat No.:    Enrolment No.

Communication Skills (110002)

DATE: 17-12-2008, Wednesday TIME: 12.00 to 2.30 p.m.    MAX. MARKS: 70

Instructions:

1.    Attempt all questions.

2.    Make suitable assumptions wherever necessary.

3.    Figures to the right indicate full marks.

Define communication. Explain communication cycle and distinguish between General and Technical communication.

Explain benefits of effective listening.

What is meant by barriers to communication? Explain intrapersonal barriers to communication.

Discuss the main elements of non-verbal communication.

OR

Discuss levels of communication.

Narrate types of Visual Aids generally used in presentation along with some tips pertaining to the use of Visual Aids.

Explain expectations in you from your prospective employer when you appear for an interview.

OR

Q.3 (a) As the Purchase Manager of Alpha Engineering Co., Salt Lake City, Kolkata, you placed an order for 15 HP scanners to National Systems Limited, Electronic City, M.G. Road, Bangalore- 560 100. You received only 12 scanners. Write a letter to General Manager (Sales & Marketing) of NSL, making a complaint and asking him to send the remaining 3 scanners immediately (Use block layout format).

Explain importance of writing resume in job application. Discuss standard parts of a resume.

You are an assistant engineer. There has been a fire in the factory and three of the workers have been badly burnt and hospitalised. You are asked to send a report to the manager. Write the report using memorandum form.

(b) Rewrite the following sentences using the correct verb from the bracket.

(i)    The mechanic and driver (is, are) ill.

(ii)    Neither the engineer nor the overseers (discharge, discharges) the duties honestly.

(iii)    None of the students (has, have) done their homework.

(iv)    Each of the boxes (weighs, weigh) ten Kilograms.

(v)    All of the students (is, are) present.

(vi)    My brother as well as my father (is, are) good at English.

OR

Q.4 (a) As the general secretary of the students union of your institution, 08 prepare a proposal of setting up of a canteen on the campus. The proposal is to be written in the form of letter and submitted to the vicepresident of students Gymkhana.

(b) Complete the following sentences using appropriate tense of the verbs 06 given in bracket.

(i)    What messages they (receive) from them today?

(ii)    He (work) as an assistant engineer for ten years now.

(iii)    He (take up) a new job already.

(iv)    We (be) in Delhi last year.

(v)    We asked him what dams he (see).

(vi)    The workmen (leave) as soon as the trouble had started.

Q.5 (a) Discuss techniques of organizational group discussion.    08

(b) Use the following homonyms in sentences so that meaning of each 06 can be understood clearly (any three pairs):

(i)	Date, Date
(ii)	Racket, Racket
(iii)	Palm, Palm
(iv)	Litter, Litter
(v)	Flap, Flap

OR

Q.5 (a) What are the reasons for poor reading comprehension? Discuss 08 techniques for good comprehension.

(b) Use the following confusables in sentences so that meaning of each 06 can be understood clearly (any three pairs):

(i)	Loath, Loathe
(ii)	Hoard, Horde
(iii)	Ingenious, Ingenuous
(iv)	Precipitate, Precipitous
(v)	Titillate, Titivate.

2

Seat No.:__Enrolment No.

(CP-3)

GUJARAT TECHNOLOGICAL UNIVERSITY

B.E. all Sem-I Examination December 08/January 09 Computer Programming and Utilization (110003)

DATE: 24-12-2008, Wednesday TIME: 12.00 to 2.30 p.m.

Instructions:

1.    Attempt all questions.

2.    Make suitable assumptions wherever necessary.

3.    Figures to the right indicate full marks.

Attempt following programs in C/C++ language.

Write a program to read two matrix from the user and store the multiplication of 05 two matrix in the resultant matrix.

i.e. C=A * B

Write a program to generate Fibonacci series of n given numbers using    05

function named fibbo.

i.e. 1 1 2 3....

Write a c++ program which is having class named student. It has two functions named readdata() and writedata() It has member elements called studID,    04

studname, studphno, studpercentage. assume suitable data type for variable.

And read the data element from the user and print the same on the screen using member functions.

Do as directed.

Find out the output of following C code. Assume all the libraries has been included and code is syntactically correct.

Void main()

{

Char cAddress[30]=Gtu Examination;

Int iX=67584;

Float fZ=95.7658;

Printf(%.6s\n,cAddress);

Printf(%7s\n,cAddress);

Printf(%010d\n,iX);

Printf(%10d\n,-iX);

Printf(%*.*f\n,7,2,fZ);

Printf(%e\n,fZ);

Printf(%12.4e\n,-fZ);

}

Find out the error if any in the following code and correct it and give the output. Void main()

^{

Int iNo[3] = {10,20,30,40};

Char cName[] = exam;

Char cMidd[]= university;

Strcpy(cName,cMidd);

Printf(%d,iNo[0]);

Printf (%s,cName);

^}

Attempt any two.

What is structure? How do we declare and access structure variables?

What do you mean by recursive function? Explain with small example.

Explain conditional operator with small example.

Do as directed.

Draw a flow chart to find the maximum number out of three given numbers. What is program? Explain break and continue with example.

Explain following string manipulation functions. Strncmp(),strlen(),strcat(),strstr(),strchr();

OR

Do as directed.

Draw a flow chart to do the sum of 10 elements read from the user.

List out operators used in C language and explain any four with example.

What do you mean by constants in C language? Explain types of constants in detail.

Do as directed.

What is pointer? Write a program to do swapping of two elements using pointers.

List out the categories of functions. Explain any one category with example. State the difference between Structure and Union.

OR

Do as directed.

Write a program to find out sum of 6 elements of array using pointer.

What is scope, visibility and life time of variables? Explain Static variables with example.

State the difference between entry control loop and exit control loop.

Do as directed.

Explain the concept of Class, Object, Polymorphism and Inheritance.

Explain structure of class with example.

What is inline function? Explain with example.

OR

Do as directed.

Give the difference between object oriented language and procedure oriented language.

Explain friend function with example.

What are the characteristics of constructor? Explain how to initialize the variable using constructor.

Seat No.:__Enrolment No._

(EC-7)

GUJARAT TECHNOLOGICAL UNIVERSITY

B.E. all Sem-I Examination December 08/January 09 Elements of Civil Engineering (110004)

DATE: 29-12-2008, Monday TIME: 12.00 to 2.30 p.m._MAX. MARKS: 70

Instructions:

1.    Attempt all questions.

2.    Make suitable assumptions wherever necessary.

3.    Figures to the right indicate full marks.

Q.1    14

(a)    Discuss the impact of infrastructural development on the economy of a country.

(b)    Explain the fundamental principles of surveying. List the moden tools used for surveying and mapping. Explain any ONE in detail.

(c)    Explain the loads which are to be taken into account while designing the foundations of a structure.

Q.2

(a)    Explain with a neat sketch the hydrological cycle. List the various sources of 07 water. Briefly explain the term "Watershed development

(b)    Explain the various aids and devices used to control, regulate and guide traffic. 07 Also give the advantages and disadvantages of traffic signals.

OR

(b) What is meant by traverse surveying? How does it differ from chain surveying? 07 Distinguish between a closed traverse and an open traverse.

Q. 3    14

(a)    Describe, with a neat sketch, the optical square and explain its principle. How is it used in field? How is it tested and adjusted?

(b)    Draw a neat sectional elevation of a prismatic compass and name the parts of the instrument thereon. Also describe the use of prismatic compass.

(c)    A line was measured with a steel tape which was exactly 30 m at 18 ⁰C and a pull of 50 N and the measured length was 459.2m. Temperature during measurement was 28 ⁰C and the pull applied was 100 N. The tape was uniformly supported during the measurement. Find the true length of the line if the cross sectional area of the tape was 0.02 cm² , the coefficient of expansion per ⁰C =

0.0000117 and modulus of elasticity = 21 x 10⁶ N/cm².

OR

Q.3    14

(a)    What is meant by local attraction? How is it detected? How is the observed bearing corrected for local attraction?

(b)    The bearing of the sides of a traverse ABCDE are as follows:

Side	Fore bearing	Back bearing
AB	1070	2870
BC	220	2020
CD	2810 30'	'0 3 0 01
DE	1890	90
EA	1240 30'	3040 30'

Compute the interior angles of the traverse.

(c ) What is meant by closing error in a closed traverse? How would you adjust it graphically?

Q.4    14

(a) The following consecutive readings were taken with a level and a 4m leveling staff on a continuously sloping ground at a common interval of 30 m on line AB.

Chainage (m)	0	30	60	90	120	150
Level staff reading (m)	0.585	0.930	1.95	2.845	3.645	3.930
Station	A					B

The reduced level (RL) of station A is 50.00. Calculate the reduced levels at all the points where the leveling staff is placed. Tabulate the results and apply usual checks.

Also determine the gradient of line AB.

(b)    Describe with sketches, the characteristics of contours and also explain the uses of contour maps.

(c)    Name five construction works where you would use stonework? State also what stones would you recommend for these works?

OR

Q.4    14

(a)    What are OPC, PPC and PSC? What types of cements are commonly available in India and used for reinforced concrete construction?

(b)    Explain the necessity of conservation and development of water resources in a region.

(c)    What are the various systems of classifying roads? Briefly outline the classification based on location and function as suggested in the Nagpur Road Plan.

Q.5    14

(a)    Enumerate the important ingredients used in modern concrete. Give a brief account of the different types of steel bars used in reinforced concrete construction.

(b)    Draw a detailed PLAN of a room of size 4 m x 3 m. Take plinth height = 60 cm.

Also prepare the schedule giving relevant description of door, window, and ventilator and cupboard.

(c)    Explain how the traffic flow characteristics studies are useful.

OR

Q.5    14

(a)    Draw a detailed sketch of a cross section of a wall showing the components of the building.

(b)    Explain the different types of paints used in building construction.

(c)    List the hydraulic structures constructed for storage and conveyance of water and explain any ONE in detail.

2

Seat No.:__Enrolment No._

(EE-8)

GUJARAT TECHNOLOGICAL UNIVERSITY

B.E. all Sem-I Examination December 08/January 09

Elements of Electrical Engineering (110005)

DATE: 31-12-2008, Wednesday TIME: 12.00 to 2.30 p.m. MAX. MARKS: 70

Instructions:

1.    Attempt all questions.

2.    Make suitable assumptions wherever necessary.

3.    Figures to the right indicate full marks.

4.    Symbols have their usual meanings.

Q.1

(a)    Define temperature co-efficient of resistance. How resistances of different 08 materials vary with temperature? Prove that a_t = a₀/(1+ a₀t)

(b)    Explain the following terms: (i) Magnetomotive force (ii) Magnetic field 06 Intensity (iii) Reluctance

Q.2

(a)    Derive the expression for the voltage across the capacitor at any instant after 07 the application of dc voltage V to a circuit having a capacitance C in series with resistance R.

(b)    An iron ring having a cross sectional area of 5cm x 4cm and a mean 07 diameter of 18 cm has a coil of 270 turns uniformly wound over it. A current of 1.27 A flows through the coil which produces a flux of 1.13 mWb in the ring. Find the reluctance of the circuit, the absolute and relative permeabilities of iron

OR

(b) Two inductive coils are connected in parallel. Derive the expression for 07 total inductance when (i) coils are in parallel aiding connection (ii) coils are in parallel opposing connection

Q.3

(a)    Explain the method of transforming a star network of resistances into delta 09 network and vice versa.

(b)    For the network shown in figure 1, determine the current supplied by the 05 battery using star-delta transformation.(All resistances are in ohms)

figure 1 OR

Define (i) form factor (ii) peak factor. Obtain the rms value and average 08 value of half wave rectified sinusoidal voltage wave.

Three currents are represented by ii = 10sinrot; i₂ = 20sin(rot - n/6); 04 i₃ = 30sin(rot + n/4).Find magnitude and phase angle of resultant current.

A certain waveform has a form factor of 1.2 and a peak factor of 1.5. If the 02 maximum value is 100, find rms value and average value.

Discuss resonance in R-L-C series circuit. Explain how pf, X_L and R vary 10 with frequency.

Define power factor. What is the power factor of a pure inductor? Give the 04 difference between active and reactive power.

OR

Prove that power in a 3-phase balanced circuit can be deduced from the 10 readings of two wattmeters. Draw the relevant connection and phasor diagrams. Discuss the nature of power factor (i) when two readings are equal and positive (ii) when two readings are equal but opposite in sign (iii) when one wattmeter reads zero.

Three similar coils each of resistance 28Q and inductance 0.7H are 04 connected in (i) star (ii) delta. If the supply voltage is 230V, 50Hz, calculate the line current and total power absorbed.

Explain the following methods of charging a battery (i) Constant current method (ii) Constant voltage method    06

Classify and explain various types of lighting schemes.    06

What is the function of fuse in an electrical circuit? State the desirable 02 properties of fuse element.

OR

Explain the wiring diagram of a tubelight with choke and glow starter.

(b) State the different methods of earthing and explain any one of them.

GUJARAT TECHNOLOGICAL UNIVERSITY

B.E. all Sem-I Examination December 08/January 09

Seat No.:    Enrolment No.

(E-1)

Elements of Mechanical Engineering (110006)

DATE: 15-12-2008, Monday

Instructions:

1.    Attempt all questions.

2.    Make suitable assumptions wherever necessary.

3.    Figures to the right indicate full marks.

4.    Use of Steam Tables and Molliers Chart is permissible.

(a)    Derive an expression for efficiency of Carnot cycle.

(b)    In an Otto cycle the compression ratio is 8.The temperatures at the beginning of compression and at the end of heat supply are 310 K and 1600 K respectively. Assume y = 14 and Cv = 0.717 kJ/kg K .

Find :

(i)    Heat Supplied

(ii)    Efficiency of the cycle.

(c)    The compression ratio of an oil engine working on Diesel Cycle is 15. Cut off takes place at 12 % of the working stroke. The air is drawn in to cylinder at 100 kPa and 27⁰C. Assume Cp=1.006 kJ/kg K and Cv =0.717 kJ/kg K. Calculate:

(i)    Temperature at the end of compression

(ii)    Pressure at the end of compression

(iii)    Air std. efficiency of the cycle.

OR

(a)    Differentiate between fire tube and water tube boiler.

(b)    List various mountings and accessories and explain fusible plug.

(c)    A stem generator evaporates 18000 kg of water per hour at 10 bar ab. pressure. The steam is 97 % dry. Feed water temperature is 40⁰ C. Coal is fired at a rate of 2050 kg per hour, having calorific value 28000 kJ/kg.

Calculate:

(i)    Thermal efficiency

(ii)    Equivalent evaporation per kg of coal.

(a)    Explain working of Watt governor with sketch.

(b)    Explain working of single acting reciprocating pump with air vessels.

(c)    Define volumetric efficiency with p-v diagram and usual notations. Prove that volumetric efficiency of reciprocating compressor is 1-C [(p2/p0¹'ⁿ -1]

OR

(a)    What is split air conditioner? State its advantages over window airconditioner

(b)    What is refrigeration? What is refrigerating effect? What is one ton refrigeration?

(c)    A single stage, single cylinder reciprocating air compressor with negligible clearance takes 1 m³ of air per minute at 1.013 bar and 15C. The delivery pressure is 7 bar. Assuming law of compression pv¹³⁵ = C, R=0.287 kJ/kg K. Calculate:

(i)    Mass of air delivered per minute

(ii)    Delivery temperature

(iii)    Indicated Power

(iv)    Isothermal efficiency

(a)    Differentiate between clutch and coupling. Describe Disc clutch.

(b)    Compare belt drive, chain drive and gear drive.

(c)    Explain the function of Flywheel with turning moment diagram.

OR

(a)    Define Ductility, Elasticity, Plasticity and Weldability

(b)    State the first law of thermodynamics. State its limitations.

(c)    List the various liquid fuels. State its advantages over solid fuels.

Attachment: gujarat-technological-university-2009-b-e-aeronautical-engineering-52375-1.pdf gujarat-technological-university-2009-b-e-aeronautical-engineering-52375-2.pdf gujarat-technological-university-2009-b-e-aeronautical-engineering-52375-3.pdf gujarat-technological-university-2009-b-e-aeronautical-engineering-52375-4.pdf gujarat-technological-university-2009-b-e-aeronautical-engineering-52375-5.pdf gujarat-technological-university-2009-b-e-aeronautical-engineering-52375-6.pdf

Earning:   Approval pending.