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Control Systems

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

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

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Control Systems
A system is stable for (where GM = Gain Margin and PM = Phase Margin):

 GM -ve.
 GM and PM both +ve.
 GM and PM both -ve.
 PM - ve.

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Control Systems
what is the Laplace transform of a function δ(t-2)?

 0
 2
 2s
 e-2s

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Control Systems
The phase of lead compensator of the system G ( s ) = ( s + a ) / ( s + b ) is at its maximum at:

  √( ab ).
 √( a / b).
  ab.
  a / b.

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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

 zero
 infinite
 unity
 0.707

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Control Systems
Find the Laplace transform for sinωt?

 1/s
 ω/(s²+ω²)
 s/(s²+ω²)
 1/s²

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