A three-phase synchronous generator is rated 16 kV and 200 MVA, has negligible losses and has reactance of 1.65 pu. The generator is operated on an infinite bus of 15 kV voltage and delivers 100 MVA at 0.8 Power Factor, lagging.

a)Determine the internal voltage (E_i), the power angle (δ), and the line current of the machine.

b)If the field current of the machine is reduced by 10%, while the mechanical power input to the machine is maintained constant, determine the new value of the power angle (δ) and reactive power delivered to the system.

c)The prime mover is next adjusted without changing the excitation so that the machine delivers zero reactive power to the system. Determine the new power angle (δ) and the real power being delivered to the system.

d)What is the maximum reactive power that the machine can deliver if the level of excitation is maintained as in part b?

I have a question about machine languages. Why do values that are being compare have to be either signed or unsigned? Why cant one value be signed while the other is unsigned in machine language? If you don't understand what I mean by machine language, I am referring to programming language where instructions such as load and store is used. Thank you.

Voltage sag is considered the most costly PQ event. Basically, it affects most of the process facilities in the plant. The EPD SDN BHD is a plastic plant. The plant is very diligent in monitoring the power system. They identify the fact that the voltage sag has occurred over the past 5 years. The total number of voltage sag is 14 events per year and causes damage to the facility. They also identified the fact that they loss RM 120, 000 ringgit per event due to this equipment. The plant does post-event cleaning.
a) Explain with suitable justification which equipment has been used by this plant to measure and record the occurrence of voltage sag in a year.

b) The management of the plant intends to double the size of the plant because they cannot keep up with the production. Suggest a good solution; how this plant could solve the PQ problem and minimize the loss.

c) The solution for part b) may be expensive, and they cannot effort any capital for this solution. As a technical advisor how could you convince the management of the plant such that they can listen to you?

What does Shunt resistance mean? What are the differences between serious and shunt?

According to the perspective of QPSK digital signal processing, design a block diagram for the given diagram below and explain for the given diagram (how does the signal go through the given diagram).

The following figure is a  homodyne detection for coherent optical fiber communications . Once is the signal from laser and the other one is the local oscillator. After the QPSK demodulation, the electric field E will go through the photo diode detection. (you dont have to consider the photodiode in the block diagram design,but if you know how to do that, please do so :) )

The thumbs up will be guaranteed if you state your answer clearly :)

1. Create a State-Space Representation of following coupled second order differential equation? Define state vector as X =[x,x',a,a']^T. Control input as u= V. And output as y = [x,a]

-0.85306x ''+ 0.08391a ''- 21.149x '- 0.444a' = V

0.399483x'' – 0.10241a'' - 21.149x'' – 0.444a' + 3.91892a= V

Explain what a Long Transmission line is. What can be the result of a lagging and leading load with regards to the Sending end voltage, Sending end Power, efficiency and voltage regulation?

VHDL code for a 4 to 2 priority encoder. The structural behavior must be written using gates.

A photovoltaic module is used to supply constant 12 V that needed by a Tablet. Depending on insolation from the Sun, the photovoltaic module’s output voltage is changing between 18 V to 36 V (dc). Thus, a buck converter is used between the netbook and the photovoltaic module.

1) What is the duty ratio range of the dc/dc converter?

2) If the inductance of the buck converter inductor is 40 uH, what is the minimum switching frequency to limit the current ripple in the inductor to less than 1 A? 3) At constant 12 V, what is the minimum power consumption of the Tablet to keep the inductor current always continuous?

4) For the operation condition stated in 3), draw (not simulate and plot) the waveforms of i) switching status, ii)voltage cross the diode , and iii) inductor current; mark the values for each waveform

Describe briefly the breakdown of liquids below intrinsic strength due to 3 types of
impurities.

Describe ATPV and its recommended level referring to the standards and ENA. Why is such a level recommended? How are these clothing
tested for performance?

Question 20 (1 point)

The ________ circuit overcomes the problem of false switching caused by noise on the input(s).

A) Schmitt trigger

B) input noise eliminator

C) differentiator

D) input buffer

Confused on this one, mainly the wording. Books states a Schimtt trigger is built in a comparator for hysteresis which helps with noise, but a schimitt triiger is not a "circuit" from what I gather in the text. Out of all the options there, the only one the book refers to as a "circuit" is a differentiator. But it states that is noisy which the question reads from what I gather stops/overcomes the noise.

The other two options are not noted anywhere in the chapter.

My reference material is from Electronic Devices by Floyd 10th Ed Chapter 13. Any help will be appreciated. Thank you.

Ex. 830. Design a proportional controller (Kp) cascaded with the plant:
  (s+12)/( (s+ 3) (s+ 7) (s+15) ) within a unity feedback system
  so that the dominant poles result in a 36% overshoot step response.
  Find Kp, zeta, wn, wd, Ts, Tp, the error constant (Kp_error) and corresponding
  SS error.  Note: Kp_error is different from Kp in the PID-TF. ans:8

Describe a case study of an electrical safety incident. Enumerate the Engineering, administrative and PPE solutions with reference to
evidence-based approaches in the literature. Ensure to add the references and relevant standards.

Imagine a ball heated to a temperature T. This Ball emits thermions with a current density at the surface given by C , which is proportional to AG(Richardson's constant) and proportional to W(Work function) .
a) Using charge conservation,find the current density at any distance 'r' from center.
b) Using continuity equation, find the charge density p(r,t) at time 't' ; t > 0 and it is given that p(r,t=0) = 0.
c) By solving Maxwell's equations, also find the electric and magnetic field vectors .