JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech III AIRCRAFT STABILITY AND CONTROL Previous Question Paper (May - 2019 - R16)
Part A is compulsory. Part B consists of 5 Units. Answer any one full question from each unit.
Part A
What is the purpose of controls in an aircraft?
Answer
The primary purpose of aircraft controls is to provide the pilot with the means to manipulate aerodynamic forces and moments to achieve and maintain a desired flight path, attitude, and airspeed. They enable the pilot to maneuver the aircraft, counteract disturbances, and maintain trimmed flight.
What is the need for stability of an airplane?
Answer
Stability is essential for safety and pilot workload reduction. A stable aircraft naturally tends to return to its equilibrium state after being disturbed by external factors like gusts. This reduces the need for constant pilot intervention, ensures predictable handling characteristics, and prevents the aircraft from diverging into hazardous flight attitudes.
What is significance of geometry of an aircraft on its stability?
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Write about flight configuration.
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What is the significance of maneuver points?
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What is the dependence of the hinge moment in analyzing stick-free stability?
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Define control fixed neutral point.
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Explain about trim gradients.
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What is adverse yaw?
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Explain about aileron reversal.
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Part B
Write the equations of motion of rigid body in both body and inertial axes system. Also write the relationship between body and inertial axes system.
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Explain the variation of longitudinal and lateral derivatives with Mach number.
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Derive the expressions for aerodynamic Stability and control derivatives.
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Explain the effect of compressibility on aerodynamic stability.
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Explain the variation of hinge moment coefficient with αt and δe.
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What are the limits on stick force gradient per g?
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Define maneuver point stick-free. Derive an expression for it.
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Explain the effect of elevator deflection on Cmcg vs α curve.
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Explain about the contribution of wing and tail to pitching moments.
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Explain in detail about dihedral effect.
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Explain about any one of the solutions to the stability quadratic of the linearised equations of motion.
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