# 21. For the following sytem, When X1(s)=0, th...

21. For the following sytem,

When X1(s)=0, the transfer function $y(s)\over x_2(s)$ is

(A) $s+1\over s^2$

(B) $1\over s+1$

(C) $s+2\over s(s+1)$

(D) $s+1 \over s(s+2)$

Hint:
Explanation:

Answer-(D) $s+1 \over s(s+2)$
Discuss the solution.