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Control Systems

Control Systems
A open loop transfer function is given as G(s) = (s+2)/(s+1)(s-1). Find the number of encirclements about '-1+j0'?

 3
 0
 1
 2

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

 0
 e-2s
 2
 2s

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

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Control Systems
The system having characteristic equation is used to be an oscillator. What is the value of k?

 2
 1
 4
 3

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Control Systems
Given a unity feedback system with G(s) = k/s(s+4), the value of k for damping ratio of 0.5 is

 4
 16
 64
 1

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Control Systems
The transfer function of the control system depends on

 the system parameters alone.
 nature of the input.
 initial conditions of input and output.
 nature of the output.

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