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Control Systems

Control Systems
In a control system, an integrator is represented by

  1 / s.
  s2.
 1 / s2.
  s.

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Control Systems
Which of the following is the correct expression for the transfer function of an electrical RC phase lag compensating network?

 RCS/(1+RCS)
 C/(1+RCS)
 RC/(1+RCS)
 1/(1+RCS)

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Control Systems
Force balancing equation of a dash-pot element is (where, x = displacement)

None of these
 B *x
 B dx/dt
 B d2x/dt2

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Control Systems
The impulse response of an initally relaxed linear system is e-2tu(t). To produce a response of te-2tu(t), the input must be equal to

 e-2tu(t).
 2e-tu(t).
 e-tu(t).
 (0.5)e-2tu(t).

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Control Systems
At which frequency does the Bode magnitude plots for the functions K/S2 have gain crossover frequency

 ω = K2 rad/sec.
 ω = 0 rad/sec.
 ω = √K rad/sec.
 ω = K rad/sec.

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Control Systems
Consider the following statements for phase lead compensation:

 nether 1 nor 2
 Phase lead compensation shifts the gain crossover frequency to the right
 The maximum phase lag occurs at the arithmetic mean of the two corner frequencies.
 both 1 and 2

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