# Electrical Engineering: Control system MCQ

##### 6. Question

A Bode magnitude plot for the transfer function G(s) of a plant is shown in them figure. Which one of the following transfer functions best describes the plant?

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##### 7. Question

Find the transfer function Y(s) / X(s) of the system given below

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##### 8. Question

In the signal flow diagram given in the figure, u_{1} and u_{2} are possible inputs whereas y_{1} and y_{2} are possible outputs. When would the SISO system derived from this diagram be controllable and observable?

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##### 9. Question

The transfer function of a second order real system with a perfectly flat magnitude response of unity has a pole at (2 – j3). List all the poles and zeros.

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##### 10. Question

The open loop poles of a third order unity feedback system are at 0, –1, –2. Let the frequency corresponding to the point where the root locus of the system transits to unstable region be K. Now suppose we introduce a zero in the open loop transfer function at –3, while keeping all the earlier open loop poles intact. Which one of the following is TRUE about the point where the root locus of the modified system transits to unstable region?

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