JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech III AIRCRAFT SYSTEMS AND CONTROLS Previous Question Paper (August - 2022 - R18)
Answer any five questions. All questions carry equal marks.
Main
How the feedback controls improve the performance of a system?
Answer
- Reduction of Sensitivity: Feedback reduces the system's sensitivity to variations in internal parameters and external disturbances, making the overall performance more robust.
- Disturbance Rejection: By sensing the output, the system can detect the effect of unwanted external inputs (disturbances) and apply corrective actions to negate their influence.
- Improved Transient Response: Feedback allows for the adjustment of system damping and natural frequency, enabling faster settling times and reduced overshoot.
- Bandwidth Enhancement: It increases the operating frequency range of the system, allowing it to track rapidly changing inputs more accurately.
- Steady-State Accuracy: By integrating the error signal, feedback can drive the steady-state error toward zero, ensuring precise tracking of the command signal.
What are the various elements responsible for a system architecture and explain the internal and external parameters responsible in the efficient functioning of a system.
Answer
The efficiency of these systems is governed by two categories of parameters:
- Internal Parameters: These relate to the system's physical and logical construction, including:
- Component Reliability: The MTBF (Mean Time Between Failures) of individual hardware elements.
- Processing Latency: The time taken by the controller to compute control laws.
- System Gain and Time Constants: The inherent dynamics that dictate stability and response speed.
- External Parameters: These represent the operating environment and interactions, including:
- Environmental Disturbances: Factors like temperature, vibration, and electromagnetic interference that affect sensor accuracy.
- Load Variations: Changes in the external force or mass that the actuator must overcome.
- Reference Signal Characteristics: The frequency and amplitude of the command inputs the system is expected to track.
What are the various parameters to be considered in finding the total power to be generated in an aircraft.
Answer
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What are the various components and systems require A.C and D.C power supply.
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What is the basic cycle used for the working of air-conditioning system used in aircraft and mention its disadvantages.
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What are the various sensors used in the detection of fire in aircraft and mention various methods used to extinguish the fire.
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Differentiate between hydraulic and pneumatic systems used for various applications in the aircraft.
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What are the various properties to be considered in selecting the hydraulic fluid used in the operation of various systems?
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How the capacity of reservoir used in the hydraulic system is decided and explain the design procedure.
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What are the different systems operated by pneumatic system in aircraft and mention its advantages and limitations over other controls.
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What are the different types of gas-turbines used for aircraft propelling and explain the advantages of after burning.
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What safety measures are to be taken in the design and fabrication of fuel tank used in the aircraft?
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How the optic fibres are used in the fully powered flight control systems?
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How the navigation and communication systems are used for the effective performance of aircraft travel?
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Write the following:
Control laws and implementation
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Need for sensors indicator
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Landing gear.
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