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Control Systems

Control Systems
For a unity feedback control system open loop transfer function then position error constant is

 40.
 20.
 infinity.
 0.

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Control Systems
The open loop transfer function of a unity feedback control system is given by G(s) = k/s(s+1). If the gain k is increased to infinity, then damping ratio will tend to become

 infinite
 0.707
 unity
 zero

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Control Systems
Given the Laplace transform of f(t) = F(s), the Laplace transform of (f(t)e-at) is equal to

 F(s+a)
 e-as*F(s)
 eas*F(s)
 F(s)/(s+a)

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Control Systems
A unity feedback control system has an open loop transfer function G(s) = k/(s(s² + 7s + 12) The gain k for which s = -1 + j1 will lie on the root locus of the system is

 5
 6.5
 4
 10

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

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

 4.
 6.
  8.
 2.

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