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Control Systems

Control Systems
A control system has open loop transfer function G(s) = k/(s(s + 2). Find the break away point?

 1
 -2
 2
 -1

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Control Systems
Number of roots in left hand half of s plane if characteristic equation is s3 - 4s2 + s + 6 = 0 ?

 3.
 2.
 1.
 0.

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Control Systems
Resonant peak of a marginally stable system is

 0
 finite value
 infinite
 any of the above

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Control Systems
Consider the following statements for phase lead compensation:

 Phase lead compensation shifts the gain crossover frequency to the right
 both 1 and 2
 nether 1 nor 2
 The maximum phase lag occurs at the arithmetic mean of the two corner frequencies.

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

 e-5s.
 1/(s-5).
 1/(s+5).
 e5s.

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Control Systems
The impulse response of a system is c(t) = -te-t + 2 e-t (t>0). Its closed loop transfer function is

 (2s+2)/(s+1)²
 (2s+1)/(s+1)²
 (2s+1)/s²
 (2s+2)/s²

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