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Control Systems

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

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

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Control Systems
In signal flow graph output node is node having only------------

None of these
 incoming branches
 outgoing branches
 both 1 and 2

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Control Systems
Certain control system has input u(t) and output c(t). If the input is first passed through a block having transfer function e-s and unit gain is applied to the applied to the system. The modified output will be

 c(t-1).u(t-1)
 c(t)u(t)
 c(t).u(t-1)
 c(t-1).u(t)

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Control Systems
A second order control system has a transfer function 16/(s² + 4s + 16). What is the time for the first overshoot?

 π/4√3 sec
 π/2√3 sec
 π/√3 sec
 2π/√3 sec

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Control Systems
The characteristic equation has the following roots for over damped stable system?

 -2±j4
 -2,-2
 -2,2
 -2,-4

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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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