The characterstic equation of a control system is given as s4+4s3+4s2+3s+K=0. What is the value of K for which this system is marginally stable

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Explanation :
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The transfer function of a controller is given as Kp+Kd.s+Where Kp, Kd and Ki are constants. What type of controller is this

1.  Proportional

2.  Proportional plus derivative

3.  Proportional plus integral

4.  Proportional plus integral plus derivative

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4
Correct Answer :

Proportional plus integral plus derivative


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The impulse response of a linear time invariant system is given as g(t)=e-t, t>0. The transfer function of the system is equal to

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Explanation :
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The open-loop transfer function of a unity feedback control system is given by G(s)=Ke-Ts where K and T are variables and are greater than zero. The stability of the closed-loop system depends on

1.  K only

2.  Both K and T

3.  T only

4.   Neither K nor T

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4
Correct Answer :

Both K and T


Explanation :
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Which one of the following polar plots corresponds to G(jω)=

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Explanation :
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For a given unity feedback system with G(s)=,What is the real axis intercept for root locus asymptotes

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2.  

3.  

4.  

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4
Correct Answer :


Explanation :
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The open-loop transfer function of a unity negative feedback control system is given by G(s)=What is the value of k which causes sustained oscillations in the closed loop system

1.  590

2.  666.25

3.  990

4.  1190

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4
Correct Answer :

666.25


Explanation :
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An open loop system has a transfer function . It is converted into a closed loop system by providing a negative feedback having transfer function 20(s+1). The open loop and closed loop system are, respectively

1.  Stable and stable

2.  Stable and unstable

3.  Unstable and stable

4.  Unstable and unstable

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4
Correct Answer :

Unstable and stable


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A closed loop system, employing lag-lead compensator Gc(s) is shown in figure hiven below. If G(s) has 3 poles in the left half of s-plane, then shape of the bode plot for G(s)Gc(s) in the highest frequency range will be

1.  -20 dB/decade

2.  -40 dB/decade

3.  -60 dB/decade

4.   -80 dB/decade

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4
Correct Answer :

-60 dB/decade


Explanation :
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The transfer function of a phase lead network, as shown in the figure given below is The value of R1 and R2 are respectively

1.  300KΩ &300KΩ

2.  300KΩ &400KΩ

3.  400KΩ &300KΩ

4.   400KΩ &400KΩ

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4
Correct Answer :

300KΩ &400KΩ


Explanation :
No Explanation available for this question
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