Final2006(2) - FINAL ASE370LFlight Control Systems Dr...

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FINAL ASE370L–Flight Control Systems Dr. Robert H. Bishop December 14, 2006 TRUE or FALSE 1. A closed-loop control system uses a measurement of the output and feed- back of the signal to compare it with the desired input. ± TRUE ± 2. This is an example of a closed-loop feedback system. R(s) Y(s) ± TRUE ± 3. A multivariable system is a system with more than one input and/or more than one output. ± TRUE ± 4. Very few physical systems are linear within some range of the variables. ± TRUE ± 5. The roots of the characteristic equation are the zeros of the closed-loop system. ± TRUE ± 6. The transfer function is the ratio of the Laplace transform of the output variable to the Laplace transform of the input variable, with all initial conditions equal to zero. ± TRUE ± 7. The state-variables of a system comprise a set of variables that describe the future response of the system, when given the present state, all future excitation inputs, and the mathematical model describing the dynamics. ± TRUE ± 8. The outputs of a linear system can be related to the state variables and the input signals by the state di±erential equation. ± TRUE ±
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9. A time-invariant control system is a system for which one or more of the parameters of the system may vary as a function of time. ± TRUE ± FALSE 10. One of the most important characteristics of control systems is their tran- sient response. ± TRUE ± 11. The system sensitivity is the ratio of the change in the system transfer function to the change of a process transfer function for a small incremental change. ± TRUE ± 12. One advantage of using feedback is a decreased sensitivity of the system to variations in the parameters of the process. ± TRUE ± 13. For a second-order system with no zeros, the percent overshoot to a unit step is a function of the damping ratio. ± TRUE ± 14. A type 1 system has a zero steady-state tracking error to a ramp input. ± TRUE ± 15. A stable system is a dynamic system with a bounded output response for any input. ± TRUE ± 16. A marginally stable system has poles on the ω -axis. ± TRUE ± 17. The Routh-Hurwitz criterion is a necessary and sufficient criterion for determining the stability of linear time-invariant systems. ± TRUE ± 18. The root-locus is the path the roots of the characteristic equation (given by 1 + KG ( s ) = 0) trace out on the s-plane as the system parameter K varies.
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This note was uploaded on 09/01/2010 for the course ASE 270L taught by Professor Dr.bishop during the Spring '10 term at University of Texas.

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Final2006(2) - FINAL ASE370LFlight Control Systems Dr...

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