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APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
FIRST SEMESTER M.TECH DEGREE EXAMINATION, DECEMBER 20 1 7

Electrical Engineering

(Guidance and Navigational Control, Control Systems)

01೯೯6203 Introduction to Flight

Max. Marks : 60 Duration: 3 Hours
Answer any two full questions from each Part. Standard Atmospheric Tables can be used

Part A

a. What is meant by standard atmosphere? Derive the pressure and density variation in the
gradient layer of the atmosphere.

b. Define temperature, density and pressure altitudes and explain their significances in
flight dynamics.

©. Anairplane is flying at a standard altitude of 5 km witha velocity of 270 m/s. At a point

on the wing of the airplane, the velocity is 330 m/s. Calculate the pressure at this point.
[4+3+2=9] 2.

a. What is meant by stable atmosphere? Derive the stability conditions of the
atmosphere.

b. Define aerodynamic flow. Explain how aerodynamic flow is classified based on flow
regimes.

c. The pressure and temperature at certain unknown altitude are measured to be 7 1 800
N/m and -10°C. Investigate the stability of the atmosphere between MSL and the
unknown altitude. Also compute the unknown altitude. Assume a linear variation of
temperature with altitude. [4+3+2—9]

a. Define Mach number. How do flight regimes classified based on Mach numbers?

b. Consider an airplane flying with a velocity of 70 m/s at a standard altitude of 4 km. At a
point on the wing of the airplane, the airflow velocity is 80 m/s. Calculate the pressure
at this point. Assume incompressible flow.

c. What is meant by boundary layer? What causes boundary layer separation? Distinguish
between laminar and turbulent flows. [3+3+3=9]

Part B