1. Output of the feedback control system should be a function of

• Input

• Reference and output

• Feedback signal

• None of these

2. For the block diagram given in the following figure, the expression of C/R is:

• G1G2G3/1-G2G1

• G1G2/1-G1G2G3

• G1G2G3/1-G1G2G3

• G1G2/G3(1-G1G2)

  
  

3. The closed loop gain of the system shown in the given figure is :

• a) -9/5

• b) -6/5

• c) 6/5

• d) 9/5

4. The advantage of block diagram representation is that it is possible to evaluate the contribution of each component to the overall performance of the system.

• True

• False

5. The overall transfer function from block diagram reduction for cascaded blocks is :

• a) Sum of individual gain

• b) Product of individual gain

• c) Difference of individual gain

• d) Division of individual gain

6. Transfer function of the system is defined as the ratio of Laplace output to Laplace input considering initial conditions________

• a) 1

• b) 2

• c) 0

• d) infinite

7. Oscillations in output response is due to :

• a) Positive feedback

• b) Negative feedback

• c) No feedback

• d) None of the mentioned

8. A signal flow graph is the graphical representation of the relationships between the variables of set linear algebraic equations.

• a) True

• b) False

9. A node having only outgoing branches.

• a) Input node

• b) Output node

• c) Incoming node

• d) Outgoing node

10. Use mason’s gain formula to find the transfer function of the given signal flow graph:

• a) abd/1-(ac)

• b) abdeg/1-(bc+ef)+bcef

• c) abd/1-(bc+ef)+bcef

• d) adcdef/1-(bc+ef)+bcef