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?

The mass flow rate of the fluid remains constant in all steady flow process. a)- true b)- false

Afull journal bearing has a journal diameter of 27 mm, with a unilateral tolerance of -0.028 mm. the bushing bore has a diameter of 27.028 mm and a unilateral tolerance of 0.04 mm. the l/d ratio is 0.5. the load is 1.3 kn and the journal runs at 1200 rev/min. if the average viscosity is 50 mpa-s, find the minimum film thickness, the power loss, and the side flow for the minimum clearance assembly.

An external consultant recommends that a plant installs a bank of capacitors for power factor correction. this will reduce the peak electrical demand charges by an average of 93 kw every month. the plant current pays $13 per kw in peak demand charges. the capacitor bank will include 223 kw of fixed capacitors, and 183 of variable capacitors. the fixed capacitors cost $59 per kw, and the variable capacitors will cost $65 per kw. the consultant charges 21% of the equipment costs to install the capacitors. because this project will reduce the demand for the electric utility, they are prepared to provide a one-time rebate of $42 per kw of reduced demand. what is the simple payback period for this project (in years)?