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Control Systems

Control Systems
The unit step response of the system is 1 - e-t(1+t). Which is the system?

 stable
 critically stable
 oscillatory
 unstable

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

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

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Control Systems
Electrical analogous quantity for spring element (K) in force-voltage analogy is

 1/C
 L
 C
 R

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Control Systems
Find the corner frequency for the following transfer function? G(s) = 1/(s+2)

 1/2 rad/s
 2 rad/s
 1/4 rad/s
 4 rad/s

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Control Systems
Find the relation of damped natural frequency (ωd)

 (ωn) √(1-4ζ²)
 (ωn) √(1-ζ²)
 (ωn) √(1-1/ζ²)
 (ωn) √(1-2ζ²)

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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'?

 0
 2
 3
 1

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