6. A node which has only outgoing branches is called a :

(a) input node

(b) output node

(c) mixed node

(d) general node

7. Three blocks with gains of 4,6 and 8 are connected in parallel The total gain of the arrangement is :

(a) 18

(b) 196

(c) 32

(d) 52

8. Block diagrams can be used to represent :

(a) only linear system

(b) only nonlinear systems

(c) both linear and nonlinear systems

(d) time –invariant as well as time –varying systems

9. Three blocks with gains of 5, 8 and 4 are connected in cascade The total gain of the arrangement is :

(a) 17

(b) 160

(c) 44

(d) 37

10. A node which has both incoming branches is called a/an :

(a) input node

(b) output node

(c) mixed node

(d) general node

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