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Electronics and Communication Engineering - Automatic Control Systems

Exercise : Automatic Control Systems - Section 2
26.
In a second order system, the time constant t of exponential envelopes depends
only on damping factor
only on natural frequency
both on damping factor and natural frequency
neither on damping factor nor on natural frequency
Answer: Option
Explanation:

27.
The maximum shift which can be provided by a lead compensator with transfer function is
15°
30°
45°
60°
Answer: Option
Explanation:

The maximum phase lead is given by

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

28.
The network of the given figure is a
lag network
lead network
lag-lead network
any of the above
Answer: Option
Explanation:

V0 will lead Vi. Hence lead network.

29.
For the given figure
Answer: Option
Explanation:

.

30.
The resistance R of a liquid flow system is defined as
change in level difference x change in flow rate
non of the above
Answer: Option
Explanation:

Electrical resistance , level difference or head is analogous to v and change in flow rate is analogous to current.

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