Exercise: Automatic Control Systems

Questions for: Automatic Control Systems

Which control action is also called rate control?
A:
Proportional
B:
Derivative
C:
Integral
D:
Proportional plus integral
Answer: B
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Examine the following statements
  1. Air and gases are compressible.
  2. Air, gases and some liquids are compressible.
  3. Oil can function as hydraulic fluid as well as lubricator.
Which of the above statements are correct?
A:
3 only
B:
2 and 3 only
C:
1 and 3 only
D:
2 only
Answer: C
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An open loop system has a forward path transfer function (42.25)/s(s + 6.5). The unit step response of the system starting from rest will have its maximum value at a time equal to
A:
0 sec
B:
0.56 sec
C:
5.6 sec
D:
infinity
Answer: D

Unit step response is Taking inverse transform, the time domain response is - 1 + 6.5t + e-6-5t. It reaches maximum value at t = infinity.

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For the system of the given figure, the undamped natural frequency of closed loop poles is
A:
2 rad/sec
B:
1 rad/sec
C:
0.5 rad/sec
D:
0.25 rad/sec
Answer: A

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In a second order undamped system, the poles are on
A:
positive real axis
B:
imaginary axis
C:
negative real axis
D:
either (a) or (c)
Answer: B

If poles are on imaginary axis the response is undamped and oscillatory.

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