0195136047.pdf

PROBLEMS 827

−

+

sJ + B

ΩR(s) E(s) 1 Ω 0 (s)

Controller

(a)

Turbine Load

Kp Kt

−

+ sJ^ +^ B

ΩR(s) E(s) 1 Ω 0 (s)

(b)

s

Ki K

t

Figure P16.2.33

−

−

++

Js

Ωr(s) 1 Ωc(s)

Td(s)

Kp Kt

Figure P16.2.34

−

−

++

Js

1

s

Ωr(s) Ki Ωc(s)

Td(s)

Kp + Kt

Figure P16.2.35

−

+

+

s 1 + τs

Ki Kt

s(1 + τs)

Kt

R(s) C(s)

U(s)

(a)

−

+

R(s) + C(s)

U(s)

(b)

Kp

Figure P16.2.36

16.2.38The parameters of the FET in a grounded-source
amplifier are affected because aging causes a net
per-unit decrease in gain of 25%. Each amplifier
circuit is designed to yield a gain (between the
input–output terminals) of 80, with the change at
no time exceeding 0.1%.

(a) Find the minimum number of stages needed

to meet the specification.

(b) Determine the corresponding feedback fac-

torH.

16.2.39(a) A system has a direct transmission function

given by