GATE ECE
Control Systems
Signal Flow Graph and Block Diagram
Previous Years Questions

Marks 1

The block diagram of a feedback control system is shown in the figure. The overall closed-loop gain G of the system is ...
By performing cascading and/or summing/differencing operations using transfer function blocks G1(s) and G2(s), one CANNOT realize a transfer function ...
For the signal flow graph shown in the figure, the value of $$\frac{\mathrm C\left(\mathrm s\right)}{\mathrm R\left(\mathrm s\right)}$$ is ...
Consider the following block diagram in the figure. The transfer function $$\frac{\mathrm C\left(\mathrm s\right)}{\mathrm R\left(\mathrm s\right)}$...
For the following system, When X1(s) = 0 , the transfer function $$\frac{\mathrm Y\left(\mathrm s\right)}{{\mathrm X}_2\left(\mathrm s\right)}$$ is ...
The transfer function Y(s)/R(s) of the system shown is ...
The equivalent of the block diagram in Figure is given as ...
Signal flow graph is used to find

Marks 2

The signal flow graph for a system is given below. The transfer function $$\frac{Y(s)}{U(s)}$$ for this system is ...
Consider the signal flow graph shown in Figure. The gain $$\frac{x_5}{x_1}$$ is ...
The signal flow graph of a system is shown in figure. The transfer function $$\frac{C(s)}{R(s)}$$ of the system is ...
An electrical system and its signal-flow graph representations are shown in Figure (a) and (b) respectively. The values of G2 and H, respectively are ...
In the signal flow graph of Fig. y/x equals ...
In the signal flow graph of Figure, the gain c/r will be ...
In the signal flow graph shown in fig X2= TX1 where T is equal to ...
For the system shown in figure the transfer function $$\frac{\mathrm C\left(\mathrm s\right)}{\mathrm R\left(\mathrm s\right)}$$ is equal to ...

Marks 5

A feedback control system is shown in figure (a) Draw the signal-flow graph that represents the system. (b) Find the total number of loops in the gra...
Draw a signal flow graph for the following set of algebraic equations: $$$\begin{array}{l}y_2=ay_1-\;gy_3\\y_3=ey_2+\;cy_4\\y_4=by_2-dy_4\end{array}$$...
Reduce the signal flow graph shown in fig. below, to obtain another graph which does not contain the node e5.Also, remove any self-loop from the resul...
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