Briefly describe the use of cascade control and its main benefits.

Use your knowledge of timers or timing mechanisms with the Do-More PLC Designer & Simulator to create Pulse Width Modulation (PWM) circuits. Trigger the following outputs:

a)Y0 with a duty cycle of 25%

b)Y1 with a duty cycle of 50%

a) Give TWO (2) types of rotor in synchronous machine and describe the differences of these two rotors.

b) A three-phase 11kV, 12 MVA, 50 Hz, 4 poles, Y-connected, 0.9 power factor lagging synchronous generator has a synchronous reactance and armature resistance of 0.05 Ω and 0.4 Ω per phase respectively. Under full load condition, the friction and windage losses are 60 kW and the core losess are 39 kW. Determine:

i) The generator speed at no-load condition in rpm

ii) The magnitude of the phase and line current

iii) The internal emf generated and power angle

iv) The voltage regulation

v) The maximum power and converted torque

1. Using your own words, explain how Siemens HMI output can be created.

The synchronous generator or alternator is an electrical machine that converts the mechanical power
from a prime mover into an AC electrical power at a particular voltage and frequency.
The synchronous motor always runs at a constant speed called synchronous speed. A three phase, 8
pole, synchronous Generator is coupled to a diesel engine running at 500 rpm. It supplies an induction
motor which has a full load speed of 1440 rpm. Find the percentage slip and number of poles of the
induction motor

1. You want to conduct an experiment to understand how the power generated by a wind turbine is affected by the speed of the wind. Write your hypothesis (1point) and explain how you can conduct the experiment (assume that you’re in laboratory conditions like we preformed the Wind Turbine experiment) eg the experiment needed and the procedure of the experiment (1 point). Which parameters/conditions in the experiment should be kept under control and which parameters should be observed to test the hypothesis? (1 point)

(b) Explain a 1-ф full wave controlled semi converter with freewheel diode for RLE load.

You have access two 7-segment decoder outputs from an existing circuit. These outputs
show the numbers 00 through 15. Build a circuit to convert the two 7-segment displays,
which display decimal, to one 7- segment display, which displays the correct
hexadecimal number.   

Design a common-emitter amplifier that has a dc input value of 15v and that meets the following requirements

1. a gain of at least 80

2. low frequency -3dB less than 100Hz

Specify the aliasing frequency of a signal that has a maximum frequency of 75 kHz and a sample frequency of 100 kHz. Use the folding diagram.

5.3 Explain how the necessary calibration frequency is determined for a measuring instrument.

Determine the response to the unit step if the Z transform of a response to the unit impulse of a causal system is:
H (z) = ((z ^ 3) -1) / ((z ^ 4) -1)

give a detailed matlab code to implement unscented KF on arbitrary first order nonlinear system