Download GTU BE/B.Tech 2019 Winter 5th Sem New 2150101 Flight Mechanics Question Paper

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Subject Code: 2150101

GUJARAT TECHNOLOGICAL UNIVERSITY

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Instructions:

1. Attempt all questions.

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2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.

1. 1. Define: Pressure, Temperature and Density altitudes. [03]
   2. Explain Attached flow and Separated flow with an example. [04]
   3. Write a note on International Standard Atmosphere. [07]

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2. 1. Explain Prandtl-Glauert rule. [03]
   2. Compare lift curves for symmetric and cambered airfoils with explanation. [04]
   3. Explain Critical Mach number. Show the effect of airfoil thickness on critical Mach number. [07]

   OR

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   1. List down different types of drag. Explain wave drag in detail. [07]
3. 1. Identify the performance of finite and infinite wings. [03]
   2. Relate the zero-lift drag and induced drag for minimum thrust requirement condition. [04]
   3. Derive expressions for Range and Endurance for jet airplane. [07]

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   OR

   1. Define: Range, Endurance, Wing Loading [03]
   2. Explain Absolute and Service Ceilings. [04]
   3. Explain V-n diagram with neat sketch. [07]

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4. 1. Define: Aspect Ratio, Pressure Coefficient, Induced drag. [03]
   2. Demonstrate the effect of altitude-on power required and power available. [04]
   3. Estimate the Landing ground roll distance at sea level for the aircraft having empty weight of 54966 kg. No thrust reversal is used; However, spoilers are operated such that L=0:"The maximum lift coefficient (CL max) with fully flaps employed at touch down is 2.5. Wing area is 29.54 m². Cpyp = 0.022 & p~0.4. [07]

   OR

   1. Derive Hydrostatic equation. [03]

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   2. Contrast Stick fixed stability and Stick free stability. [04]
   3. Make use of Newton’s 2™ law to derive the equation of motion for level unaccelerated flight. [07]
5. 1. Define and explain Elevator angle to trim the airplane to desired angle. [03]
   2. Explain Static margin. [04]

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   3. Explain Longitudinal static stability in detail. [07]

   OR

   1. Define Static Stability and Dynamic Stability. [03]
   2. Define Neutral point. Show that it is a crucial parameter for longitudinal static stability. [04]
   3. Classify different types of Flaps. [07]

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Date: 25/11/2019
Total Marks: 70

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