Control Systems

21. By which of the following the control action is determined when a man walks along a path?

1. Brain
2. Hands
3. Legs
4. Eyes

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22. By which of the following the system response can be tested better?

1. Ramp input signal
2. Sinusoidal input signal
3. Unit impulse input signal
4. Exponentially decaying signal

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23. can be extended to systems which are time-varying?

1. Bode-Nyquist stability methods
2. Transfer functions
3. Root locus design
4. State model representatives

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24. directly converts temperature into voltage.

1. Thermocouple
2. Potentiometer
3. Gear train
4. LVDT

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25. Due to which of the following reasons excessive bond width in control systems should be avoided?

1. It leads to slow speed of response
2. It leads to low relative stability
3. Noise is proportional to band width
4. None of the above

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26. For open control system which of the following statements is incorrect?

1. Less expensive
2. Recalibration is not required for maintaining the required quality of the output
3. Construction is simple and maintenance easy
4. Errors are caused by disturbances

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27. From which of the following transfer function can be obtained?

1. Signal flow graph
2. Analogous table
3. Output-input ratio
4. Standard block system

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28. has tendency to oscillate.

1. Open loop system
2. Closed loop system
3. Both (a) and (b)
4. Neither (a) nor (b)

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29. If a step function is applied to the input of a system and the output remains below a certain level for all the time, the system is

1. not necessarily stable
2. stable
3. unstable
4. always unstable

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30. If the gain of the critical damped system is increased it will behave as

1. oscillatory
2. critically damped
3. overdamped
4. underdamped

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