show that the phase is -150 at w =700.
16. A transfer function is GH(s) =
2
1
+
s
.
(16 Marks)
Using the contour in the s-plane. Determine the corresponding contour in the F(s)-
plane.
17. A single loop control system where
(16 Marks)
GH(s) =
)
1
(
+
s
s
k
τ
(a) Draw the Nyquist contour and mapping for GH(s)
(b) Determine whether the system is stable by utilizing the Nyquist criterion.
18. Determine the z transform of f(t)=sin wt for t
≥
0
(16 Marks)
19. Determine the z-transform of f(t) =
at
e
−
and t
≥
0.
(16 Marks)
A
B
C
D
E
F
G
H
ω
j
σ
-1
1
0

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Analog and Digital Control
IT 4017
for
Second Semester
Sample Answer & Question