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Control Systems

Control Systems
The value of gain margin of the system having G ( s )H ( s ) = 8 / ( s + 2 )3 is

 6.
 2.
 4.
  8.

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Control Systems
The impulse response of a system is c(t) = -te-t + 2 e-t (t>0). Its open loop transfer function is

 (2s+1)/s²
 (2s+2)/(s+1)²
 (2s+1)/(s+1)²
 (2s+2)/s²

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Control Systems
A proportional plus derivative controller

 increases the stability of the system
 improves the steady state accuracy
 has high sensitivity
 both 1 and 2

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Control Systems
The second order system defined by 25/(s2 + 5s + 25) is given a step input. The time taken for the output to settle with in 2 % of input is

 0.4 sec.
 1.6 sec.
 1.2 sec.
 2 sec.

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Control Systems
None of the poles of a linear control system lie in the right half of s plane. For a bounded input, the output of this system

  could be unbounded.
  tends to zero.
  none of these.
  always bounded.

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Control Systems
The value of 'a' in to give phase margin = 45o will be

 0.707.
 1.18.
 0.9.
 1.414.

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