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Control Systems

Control Systems
The unit step response of the system is 1 - e-t(1+t). Which is the system?

 oscillatory
 critically stable
 stable
 unstable

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Control Systems
The type number of the control system with G(s) = k(s+2)/(s(s²+2s+3) is

 2
 3
 0
 1

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Control Systems
A system has poles at 0.01 Hz, 1 Hz and 80 Hz; zeros at 5 Hz, 100 Hz and 200 Hz. The approximate phase of the system response at 20 Hz is

 -90°
 90°
 180°
 -180°

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Control Systems
Consider the following statements for phase lead compensation:

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

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Control Systems
The transfer function of a system is G(s) = 100/((s+1)(s+100)). For unit step input to the system the approximate settling time for 2% criterion is

 100 sec
 4 sec
 10 sec
 400 sec

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Control Systems
Consider the function F(s) = ω/(s²+ω²). Where F(s) = Laplace transform of f(t). The final value of f(t) is equal to

 a value between -1 and +1
 finite constant
 zero
 infinite

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