A unity feedback closed-loop system contains an open-loop transfer function 9
G(S) =
s(s+ S)
A factor D(s) = ks + I is cascaded with G(s), where K is an adjustable gain, as
shown in Fig. 3.17.
V(8)
Dis)
G(s)
Y(s)
Fig. 3.17
(a) Find the value of K necessary to provide a critically damped closed-loop
system.
(b) Find the range of values of K which will provide acceptable damping for
the closed-loop system.
(c) What is the magnitude of overshoot which follows a unit step input, when
K=0.1?

Abrake has a normal braking torque of 2.8 kip in and heat-dissipating cast-iron surfaces whose mass is 40 lbm. suppose a load is brought to rest in 8.0 s from an initial angular speed of 1600 rev/min using the normal braking torque; estimate the temperature rise of the heat dissipating surfaces.

Water at 70°f and streams enter the mixing chamber at the same mass flow rate, determine the temperature and the quality of the exiting stream. 0 psia is heated in a chamber by mixing it with saturated water vapor at 20 psia. if both streams enters the mixing chamber at the same mass flow rate, determine the temperature and the quality of the existing system.

In a unit cell of fcc structure, indicate the position of one of the tetrahedral interstitial sites by plotting the corresponding tetrahedron. do the same for one of the octahedral interstitial sites (in a separate fcc unit cell). mark the positions of all the tetrahedral and octahedral interstitial sites in the unit cells. how many equivalent tetrahedral sites and how many equivalent octahedral sites are contained in a fcc unit cell, respectively. what is the coordination number for a tetrahedral site and what is the coordination number for an octahedral site?