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Reg.No.

B.E/B.Tech. DEGREE EXAMINATION, APRIL/MAY 2006

Third semester

Aeronautical Engineering

AE 1203ELEMENTS OF AERONAUTICS

(Regulation 2004)

Time: Three hours maximum: 100 marks

Answer all questions

PART A - (10 2 = 20marks)

1. Write down the principle difference between lighter than air and heavier

than airplanes.

2.

What are biplane and monoplane/ Write down the advantages and

disadvantages of biplane over monoplanes

3. Sketch the push-pull rod control actuation for aileron operation

4.

List out the difference classification of flight vehicles

5. What are TAS and IAS

6. Define AR, Camber of an airfoil

7.

Differentiate between Pratt and Warren trusses of the fuselage constructions

8.

What are the functions of Ribs and Spars

9. Write down the difference between reciprocating and Gas turbine engines

10.Classify different types of rocket engine

C 3001


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PART-B (5 16=80 marks)

11.

(a) (i) What are the various requirements of an aircraft power plant? (4)

(ii) Explain the working of jet engine with neat sketch and discuss the merits

and demerits. (12)

Or

(b) Explain with neat sketch the components of an airplane and their

functions. (16)

12.(a) How the airplanes are classified? Discuss about various types of flight

vehicles with sketch wherever possible. (16)

Or

(b) (i) Sketch the lift coefficient versus angle of attach for different aspect

ratios. (8)

(ii) Define center of pressure and aerodynamic centre. (4)

(iii)Derive an expression for the speed of sound. (4)

13.

(a) (i) Write short notes on International Standard Atmosphere? (4)

(ii) Calculate the pressure and density at 8000m and 30000m in the

international standard atmosphere. The pressure at sea level is 101325 N/m,

the sea level temperature is 288 K and the lapse rate is 0.0065 K/m. (12)

Or

(b)Define and explain the significance of the following:

1. Bernoulli's theorem. (8)

2. Anhedral and Dihedral angle. (8)


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14.

(a) (i) Discuss the relative merits and demerits of the various materials used

in aircraft construction. (12)

(ii) Write short notes on composite materials and their merits. (4)

Or

(b)(i) Differentiate between semi-monocoque and Monocoque fuselage

structures. (5)

(ii) Explain the construction details of wing assembly. (5)

(iii) What are the forces encountered on aircraft structures during

cruising? (6)

15.(a) (i) Explain with neat sketches the construction and working of solid

propellant rocket engine system. (8)

(ii) Distinguish between turbo-jet and turbo-prop engines. (8)

Or

(b) (i) Explain with neat sketches the constructional details and working of a

bypass engine and what are its merits and demerits in comparison with

turbojet engine? (12)

(ii) What are the methods of thrust augmentation? (4)


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Reg.No.

B.E/B.Tech. DEGREE EXAMINATION, NOVEMBER/DECEMBER 2006

Third semester



(Regulation 2004)




1. Differentiate between biplane and monoplane.

2.

State the two kinds of aircraft.

3.

Differentiate between conventional and powered control.

4.

What are the basic instruments for flying?

5. Define absolute attitude.

6. Explain Mach number

7. Differentiate between Monocoque construction and semi monocoque

construction.

8.

Enumerate the composite materials.

9.

What is Ramjet engine?

10.What are the advantages and the disadvantages of rocket propulsion?


11.

(a) With the help of diagrams explain the elements of the four- stroke,

internal combustion, reciprocating engine in detail. (16)

Or

(b) (1) Explain the term Biplane Interference. (7)

T 8003


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(2)Explain the forces acting on an aero plane. (7)

(3)What is aspect ratio? (2)

12.

(a)(1) Enumerate the components used in an aero plane and explain the

purpose of each components. (6)

(2) Explain with a neat sketch the working principle of any one

instrument used for flying. (10)

Or

(b) With the help of sketches explain the flowing

(1) Longitunal control (6)

(2) Later control (6)

(3) Directional control (4)

13.

(a) (1) Explain the termsi.

Nose-heavy

ii.

Tail heavy (6)

(2) Discuss the pressure distribution round a using section. (10)

Or

(b) (1) Explain the ways an aircraft will be have when disturbs its path

(Degree of Stability) (10)

(2)Explain the terms rolling, pitching and yawing. (6)

14.

(a) (1) State the importance of composite materials used in aircraft

construction. (6)

(2) Briefly discuss the application of aluminum alloy and titanium I

air craft industry. (10)

Or

(b)Discuss in detail with the help of sketches the constructions of a typicalusing and fuselage structure. (16)

15.

(a) With the help of a diagram, explain the working and operation of turbojet

engine. (16)

Or


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(b) (1) Enumerate the types of rockets. (6)

(2) Explain with the help of a sketch, the principle of principle

operation of a rocket. (10)


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Reg.No.


Third semester


AE1203 ELEMENTS OF AERONAUTICS

(Regulation 2004)



PART A - (10 2 = 20 marks)

1. Distinguish between a glider and a sail plane.

2. What are control tabs and for what purpose they are used?

3. What the purpose is of turn and slip indicator?

4. Define international standard atmosphere (ISA) and explain its significance.

5. What are the effects of large camber on the flow over the upper surface of

the wing?

6. What are the most common maneuvers usually classed under the heading of

aerobatics?

7. What are the general types of construction of a fuselage structure?

8. What are the factors that influence the selection of the structural materials

for an aircraft?

9. What are the requirements of a good power plant?

10.Why does the blade angle of a propeller decrease from boss to tip?

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11. (a) Derive the relationship between pressure and temperature in the region

of stratosphere and troposphere. (16)

Or

(b) Calculate the pressure and density at 800m and 11000m in the

international standard atmosphere. The pressure at sea level is 101325N/ m,

the sea level temperature is 288 K and lapse rate is 0.0065K/m. (16)

12. (a) (i) Define Mach number and classify the flows based on Mac number

range. (6)

(ii) Explain indicated air speed, equivalent airspeed, and true airspeed of

an aircraft. (8)

(iii) What is meant by Magnus effect? (2)

Or

(b) (i) How do you achieve longitudinal, lateral and directional controls in

an aircraft? (8)

(ii) Sketch a typical three view diagram of an aircraft. (4)

(iii) What are the conventional types of landing gears used in aircraft?(4)

13. (a) (i) Explain with neat sketch the construction and working of an airspeed

indicator. (12)

(ii) What are the functions of flaps, winglets and slats? (2)

(iii) Define boundary layer. (2)

Or(b) (i) Define an aerofoil and what is aerodynamic efficiency? (4)

(ii) What is the cause of wing tip vortices? What is meant by induced

drag and what is the effect of aspect ratio on induced drag? (8)

(iii) What are streamlined and bluff bodies? (4)


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14.(a) (i) Explain with neat sketches the constructional details of a wing

assembly. (8)

(ii) Distinguish between monocoque and semi-monocoque structure.(8)

Or

(b) Explain in detail the main groups of materials used in aircraft

construction. (16)

15.(a) (i) Explain with neat sketches the operating principle of Turbo propeller

engine. What are its advantages and limitations? (8)

(ii) Explain why ramjet engine is not self starting type. (8)

Or

(b) (i) What is the working principle of an air-breathing engine? (4)

(ii) What are the relative merits and demerits of turbo jet and bypass

engines? (8)

(iii) What are the advantages and limitations of rocket propulsion? (4)


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Reg.No.


Third semester



(Regulation 2004)




1.

Distinguish between air breathing propulsion and rocket propulsion.

2. What are the new types of alloys used now-a-days for airframe construction

of modern aircraft?

3.

Name any four components of airframe of an airplane and mention their

functions.

4. What is stratospause?

5. Define Mach number.

6.

What are the general types of construction of an airplane structure?

7.

What are the general considerations for the fuselage design of an airplane.

Name any two.

8. What is the basic operating principle of a piston engine?

9.

Define specific impulse of a rocket.

10.

What is jet thrust?

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11.

(a) With neat illustrations, explain in detail the salient features of airplanes

with biplane and monoplane design from aerodynamics point of view. Bring

out the advantages and limitations of each type. (16)

Or

(b) Briefly describe the modern developments in aircraft design with

respect to the following: New airfoil profiles, new fuselage designs, gas

turbine engine powered propulsion system and flight control systems. (16)

12.

(a) (i) Discuss the classification of flight vehicles. Mention the criteria for

classification. (8)

(ii) What are the salient features of monologue construction of an

airplane structure? (8)

Or

(b) (i) Name any two basic instruments for flying. With illustrations explain

their operating principle. (8)

(ii) With neat sketch, explain the construction of a typical aircraft wing.Show all the structural components of wing construction and mention the

types of loads/stresses experienced by the structural members. (8)

13.

(a) Write short notes on the following:

(i) Geodesic constructions. (8)

(ii) Use of composite materials for aircraft structures. (8)

Or

(b)

Explain the following:

(i) Application of semi-monologue constructions for aircraft structures.


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(8)

(ii) Use of titanium and composite materials for aircraft components and

the need for such materials. (8)

14.

(a) (i) What is international standard atmosphere? How are the various

regions of atmosphere classified? (8)

(ii) With neat illustration, describe how lift and drag are produced, when

an airfoil is placed in a uniform air flow. (8)

Or

(b) (i) Explain how pressure, temperature and altitude are related in the

mathematical representation of atmospheric property variations with

altitude. (8)

(ii) Draw a typical sketch of an airfoil and identify the important

terminology with respect to its geometrical features. Draw any two NACA

airfoils and explain their nomenclature. (8)

15.

(a) (i) Bring out the essential differences between piston type engines and jet

engines for aircraft propulsion. (8)

(ii) What are the applications of rockets? How are they classified? (8)

Or

(b)

(i) Explain how a propeller produces thrust for aircraft propulsion. (8)

(ii) What are the merits and limitations of turbojet engines? (8)


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Reg.No.


Third semester



(Regulation 2004)



PART A-(10 2 = 20marks)

1. Distinguish between biplane and monoplane aircraft.

2.

Why it is that turbofan engine is very widely used in commercial aircraft?

3.

What is the role of rudder?

4. What is tropopause?

5. What is a cambered airfoil?

6.

What are the components of a modern airplane for which aluminum alloy is

used?

7. What are the main structural components of an aircraft wing?

8.

What are the limitations of piston engines for aircraft propulsion?

9.

Define specific impulse of a rocket.

10.Why it is that titanium is suitable as airframe material for supersonic

aircraft?

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11.(a)(1) Briefly explain how the modern developments in the subjects of

aerodynamics and aerospace materials influenced aircraft design? (8)

(2) Bring out the essential difference in the structural design approaches

of fuselage with respect to early airplane and modern airplane. (8)

Or

(b)(1) Briefly explain why replaced piston engines in aircraft propulsion

engines replaced piston engines in aircraft propulsion with modern

developments? (8)

(2) What factors limit the speed of present day commercial aircraft? (8)

12.

(a)(1) Discuss the classification of flight vehicles, with respect to principle

of operation and configuration. (8)

(2) Name the basic instruments for flying and explain the principle of

operation of any two with illustrations. (8)

Or

(b)(1)Distinguish between conventional; control a powered control ofaircraft. Bring out the essential difference. What are the limitations of

conventional control? (8)

(2)Sketch a typical system for control actuation. Explain the operation

.What are the recent development with a neat sketch. (8)

13.(a) (1) what is International standard Atmosphere? Describe the basic

structure of atmosphere with a neat sketch. (8)

(2) Derive relations for pressure and temperature variations with

altitude.(8)

Or


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(b) (1) Sketch a typical airfoil and explain how lift, drag and moment are

generated, when facing a prestream. What is the effect of angle of attack on

the pressure distribution on the surface of the airfoil? (10)

(2)Define Mach number. How is it related to the temperature of the

medium? What is the effect of Mach number on the drag of an airfoil? (6)

14.

(a) Write short notes on the following

(1)

Monocoque construction and (8)

(2)Geodesic construction of airplane structures (8)

Or

(b) (1) what is the role of composite materials in the modern airplane

construction? What are the prime components of the modern airplane?

Which are considered for the composite material? (10)

(2) Which parts/components of an airplane can be made of stainless

steel? What are the functional requirements of s such components? (6)

15.

(a) (1) Sketch a schematic diagram of a turboprop engine marks all the

subsystems and explain their functions what are the limitations of a turbo

prop engine? (10)

(2) Illustrate the principle of operation of a solid propellant rocket with a

neat sketch. What are the advantages of solid propellant rocket? (6)

Or

(b) (1) sketches a typical liquid propellant rocket power planet and namesthe important components. What are the advantages of liquid propellant

rockets or solid propellant rockets? (10)

(2) What are the applications o a turbojet engine? How does thrust vary

with altitude and fight velocity for a turbojet? (6)


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Reg.No


Third semester



(Regulation 2004)




1. What are high lift devices? What has prompted their development?

2.

What is the basic difference between a hot air balloon and an aircraft?

3.

What is equivalent air speed? How is it related to true air speed?

4. What are the functions of ailerons in an aircraft?

5. Define Troposphere and temperature lapse rate.

6.

Define aerodynamic centre.

7. Enumerate the stiffener shapes used in aircraft fuselage shell.

8.

What are the main advantages and disadvantages of composite materials foraircraft structures?

9.

State the propellant burning configurations possible in solid propellant

motors.

10.What are hypergolic propellants? Give an example.

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11.(a) (i) What are the advantages and disadvantages of monoplanes compared

to biplanes? (6)

(ii) Explain why swept back wing concept has been developed. (5)

(iii) Discuss the advantages of carry through structures connecting

cantilever wings. (5)

Or

(b) Describe a Ramjet engine and compare its working principle with

SCRAMJET and turbojet engines. (16)

12.

(a) Describe the major components of an aero plane with a neat sketch and

explain their functions. (16)

Or

(b) (i) Enumerate the basic instruments used for flying. (4)

(ii) Describe the flight instruments measuring ATTITUDE of an aircraft.

(12)

13.

(a) (i) Discuss the temperature variation with altitude of standard atmosphere

and classify the atmospheric layers. (6)

(ii) Derive the expressions relating the standard atmosphere values of

pressure, density and temperature at any altitude in the troposphere with that

of sea level values. (10)

Or


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(b) (i) Describe an aerofoil and explain its nomenclature. (5)

(ii) Define centre of pressure, coefficient of pressure and Mach number.

(6)

(iii) Express lift and drag of an aerofoil in terms of normal and axial

forces. (5)

14.

(a) Explain how aero plane wings are constructed and indicate the choice of

materials for the main components. (16)

Or

(b) (i) Write a short note on composite materials and their applications to

aircraft construction. (5)

(ii) Discuss briefly the choice of material for aircraft engine components.

(5)

(iii) Discuss the need for Alclad aluminum alloys for aircraft structures.

(6)

15.(a) (i) With a neat sketch explain the principle of operation of a turbo prop

engine. (10)

(ii) What is a cryogenic rocket engine? Explain. (6)

Or

(b) (i) Thrust produced by an aircraft engine is best explained by Newton's

third law of motion. True/False? Justify your answer. (4)

(ii) Define propeller efficiency. (2)

(iii) Describe a turbofan engine with a neat sketch and explain why the

efficiency of this engine is better than a turbojet engine. (10)


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