Exercise: Automatic Control Systems

Questions for: Automatic Control Systems

The network of the given figure is a
A:
lag network
B:
lead network
C:
lag-lead network
D:
any of the above
Answer: B

V0 will lead Vi. Hence lead network.

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The maximum shift which can be provided by a lead compensator with transfer function is
A:
15°
B:
30°
C:
45°
D:
60°
Answer: B

The maximum phase lead is given by

In this case a = 1/3. Hence sin Φm = = 0.5 or Φm = 30°.

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In a second order system, the time constant t of exponential envelopes depends
A:
only on damping factor
B:
only on natural frequency
C:
both on damping factor and natural frequency
D:
neither on damping factor nor on natural frequency
Answer: C

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The transfer function has the characteristics of high pass filter.
A:
True
B:
False
C:
D:
Answer: B

When ω is high, the output is low.

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The frequency at which magnitude of closed loop frequency response is 3 dB below its zero frequency value is called critical frequency.
A:
True
B:
False
C:
D:
Answer: B

It is not critical frequency.

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