Download PTU B.Tech 2020 March Aero 5th Sem ANE 315 Aircraft Performance Question Paper

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Roll No. [ TTTTTT] [ ] Total No. of Pages : 02
Total No. of Questions : 09

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INSTRUCTIONS TO CANDIDATES :

1. SECTION-A is COMPULSORY consisting of TEN questions carrying TWO marks each.
2. SECTION-B contains FIVE questions carrying FIVE marks each and students have to attempt any FOUR questions.
3. SECTION-C contains THREE questions carrying TEN marks each and students have to attempt any TWO questions.

SECTION-A

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1. Attempt the following :
   1. Define ‘Wing loading” and explain its importance.
   2. Distinguish between ‘Range’ and ‘Endurance’.
   3. Define ‘Aerodynamic Center’-& ‘Center of Pressure’
   4. Distinguish between ‘Geometric’ and ‘Geo-potential’ altitude.
   5. Distinguish between ‘Isothermal” and ‘Gradient’ regions.

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   6. Distinguish between ‘Washin’ and ‘Washout’.
   7. Distinguish between ‘Chord line’ and ‘Camber line’.
   8. Define ‘Temperature altitude’.
   9. Define ‘Drag divergence Mach number’ and explain its importance.
   10. Define ‘zero-lift” angle of attack.

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SECTION-B

2. Calculate the standard atmospheric values of T, p and p at a geo-potential altitude of 18 km. Assume Lapse rate of —6.5 K/km in the gradient region. (1,2,2)
3. Explain ‘Delta Wing Aerodynamics’ at Low Speed with the help of labeled illustration/plots. (5)
4. Derive the expression for lift coefficient and drag coefficient for minimum power condition. (5)

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5. Define and explain various high lift devices. Show their effect on lift curve slopes. (5)
6. Derive the expression for take-off distance. (5)

SECTION-C

6. Gulfstream-IV twin turbofan executive transport with weight of 200000N, planform area of 80 m” and drag polar as Cp = 0.015 + 0.08C.* is flying at an altitude of 10 km (p=0413 kg/m3). Calculate :
   1. (CL*/Cp)maxs (CL/Cp max and (Cr."*/Cp)Yuas values. (5)
   2. Velocities at which (C**/Cp)maxs.(CL/Cp)max and (CL"*/Cp)max 0ccur. (3)

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7. Write notes on the following :
   1. Drag and its categorization (5)
   2. V/STOL vehicles (5)
8. Define 4-digit, 5-digit and 6-digit NACA series airfoils. What are laminar and supercritical airfoils? Where are these airfoils used? (6,4)

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NOTE : Disclosure of Identity by writing Mobile No. or Making of passing request on any page of Answer Sheet will lead to UMC against the Student.

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