Electromagnetic theory 2

(a) Obtain the expressions for Ex and Ey for the transverse electric case and show that they satisfy the condition Ell *= 0 on the boundary.

(b) A rectangular metallic waveguide has dimensions, a = 3.0 cm and b = 4.0 cm. Find out the modes (TE and TM) in which a free space wavelength of 4.5 cm could propagate through it.

(c) A waveguide has an inside dimension of 6cm x 1cm. Find the first 3 modes and its cut-off frequencies. In the situation where you would want to have only one mode of propagation, what will be the proposed frequency range?

EII= E parallel

0. We are designing an ECG circuit that has three parts, including (1) Instrumentation Amplifier (2) High-pass filter (3) Low-pass filter. Each part should have the gain of 10, so the entire circuit should have the gain of 1000. We will add a LED driver at the end to be lit when detecting heartbeat.

Design

1. Design a differential amplifier with the gain equal to one and use 10k? for its feedback resistor. Calculate the resistor value on the non-inverting end with the actual measurement of all other resistors and combine up to 4 resistors to achieve the best CMRR.

2. Add the non-inverting front-end circuit to the differential amplifier designed in step 1 to create an instrumentation amplifier. The instrumentation amplifier requires a gain of 10.

A: Design a full bridge three phase/three phase cyclo-convertor showing its principle of operation using graphical representation

Generate a baseband message signal m(t) to be a square waveform of duration 120 msec and amplitude
1 V. The sampling frequency is -
= 10 . Use a carrier of amplitude 1 and frequency 600 Hz and
perform the following modulation/demodulation operations:
1. DSB-SC
a. modulation of the message signal m(t)
b. coherent demodulation, assuming that the local carrier @ the receive-side is perfectly
synchronized in frequency and phase with the transmit-side carrier.
c. lowpass filtering of the demodulated output and signal recovery
( )
2. AM
a. modulation
b. noncoherent demodulation (for ex. you can use a rectifier)
c. lowpass filtering of the demodulated output and signal recovery
( )
3. SSB-SC
a. modulation (using Hilbert transform method preferred)
b. coherent demodulation, assuming that the local carrier @ the receive-side is perfectly
synchronized in frequency and phase with the transmit-side carrier.
c. lowpass filtering of the demodulated output and signal recovery
( )
For each modulation scheme, calculate the energy of the estimation error : () = (
( ) −
( ))


over the signal’s duration T, and compare all modulation schemes.
Plot in both time and frequency domains:
1. Message signal.
For each of the 3 above cases you should plot in both time and frequency domains:
2. Modulated signal.
3. Demodulated signal.
4. Recovered signal
( ).
You will need to design the proper FIR lowpass filter (LPF) (filter order and cutoff frequency), to filter
the demodulated signal, and produce the recovered signal
( ).
For your report, please create a word document to include all results and Matlab plots and code.

q1) using Matlab make a code that allows a user to enter a function like fractional function and cubic liner function then the Matlab send a domain, range, continuity

Briefly Give one to two line logical answer to the following Question

(a)IN PCM How the parameters fieldlity bandwidth and time delay can be traded off?

(b)If the number of bits in signal to noise ration is increased what will be its effect?How to reduce signal to noise ratio?If number of bits are incraesed signal to noise ratio is decrease?

(c)non unform quantization is better than uniform quantization?

(d)Why is it often preffered to use units of normalized bandwidth,WT,comapred with bandwidth alone?

(e)What is the dfference between PCM andPAM?Which one is better?

(f)  For a known signal space how you can determine the number of correlators used at the receiver ?

(g) Which type of binary signaling you prefer to use in digital communication among unipolar , antipodal and orthogonal ?

A 5-kW, 250-V shunt motor has an armature resistance of 0.1 ? and a field-circuit resistance of 80 ?. When the motor is operating at rated voltage, the speed is observed to be 1200 r/min when the machine is loaded such that the armature current is 30 A. In order to protect both the motor and the dc supply under starting conditions, an external resistance will be connected in series with the armature winding (with the field winding remaining directly across the 250-V supply). The resistance will then be automatically adjusted in steps
so that the armature current does not exceed 300 percent of rated current. The step size will be determined such that, until all the external resistance is switched out, the armature current will not be permitted to drop below 150 percent of rated current. In other words, the machine is to start with 300 percent of rated armature current and as soon as the current falls to 150 percent of rated current, sufficient series resistance is to be cut out to restore the current to 300 percent. This process will be repeated until all of the series resistance has been eliminated.
i. Find the maximum value of the series resistance.
ii. How much resistance should be cut out at each step in the starting operation and
iii. At what speed should each step change occur?
iv. Plot the following graphs; time versus speed, time versus the generated Voltage (Ea) and time versus the armature current.

How does rotating the coil in the electric motor affect the needle of the galvanometer move? Explain why the needle deflects when the coil in the electric motor rotates.

I have been given a project to do that will have the potential of being implemented. The scope of the project is to come up with a remote monitoring system for the status of a pump-motor arrangement which has a valve in front of it that also had to be monitored. The level of the water in the tank where the pump is pumping has to be monitored by the use of float switches. This all has to be with the aid of instruments like flow switches, float switches and other instruments through a microprocessor and a controller and has to be taken to an Human Machine Interface.

Please help me come up with how you can intergate an Arduino controller to monitor the status of the Physical Plant remotely. Please explain briefly and show stages theorticaly how this project would work and provide me with a sketch. Thank you

No handwriting, please  

What is a real-time system? What do we mean by hard and soft real-time systems?

Discuss, based one real-time operating system and one general purpose operating system, the differences between a real-time operating system and a general-purpose operating system.?

Explain why reducing the size of U, V , and ? may not have significant effect on the quality of an image.