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Control Systems

Control Systems
The Laplace transform of a transportation lag of 5 seconds is

 e-5s.
 1/(s-5).
 e5s.
 1/(s+5).

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Control Systems
The open loop transfer function of a unity feedback system is given by G(s) = 1/(s+2)². The closed loop transfer function will have poles at

 -2,2
 -2+j,-2-j
 -2,-2
 -2,-1

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Control Systems
Force balancing equation for elastic element (K) is (where, x = displacement)

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

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Control Systems
The transfer function of a plant is T(s) = 5/(s+5)(s² + 5 + 1). The second order approximation of T(s) using dominant pole concept is

 5/(s+1)(s+5)
 1/(s² + 5 + 1)
 5/(s² + 5 + 1)
 1/(s+1)(s+5)

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Control Systems
A proportional plus integral controller

 it increases rise time
 increases the stability of the system
 both 2 and 3
 has high sensitivity

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Control Systems
The following transfer function represents a phase-lead compensator?

 (4s+2)/(6s+1)
 1/s
 (s+4)/(3s+6)
 (s+4)/(s+6)

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