Electrical Engineering Answers

In an unbalanced, three-phase, star-delta system has a frequency of 50 Hz, and CBA phase rotation.The phase impedances

of the load are as follows:

 Z_ab =29.41∠ 54.69°Ω ;      Z_bc=25.61∠-38.66° Ω ;    Z_ca =17.8 ∠ 51.84° Ω

The emf of the source is represented by:e_c(t)=221.831 𝐬𝐢𝐧 (𝛚𝐭 +(𝟓𝝅/𝟏𝟖) ) V

Calculate the phase current,( I_ab, Ibc & Ica) of the load in polar form.

Calculate the active power( P_ab, P_{bc ,} Pca) in phase AB of the load in phasor form.

Determine the line current,( I_a, I_{b &} I_c) in polar form.

If two wattmeters are connected in lines a and b respectively of the above circuit to

measure the active power, 

Determine the reading of the wattmeter,(W_a) connected in line a.

Determine the reading of the wattmeter,(W_b) connected in line b.

1) Develop an argument on the fact that Even parity (4,3) code is a linear block code whereas an Odd parity (4,3) is not based on the three basic conditions for linear block codes.

2) What is hamming distance? Write Cyclic codes of a (4,7) encoding scheme and calculate the minimum and maximum hamming distance.

3) Draw the look-up table, trellis diagram, tree diagram and state diagram for a (2,1,4) convolution encoding scheme.

Assume a rectangular waveguide with dimensions a=2 cm and b=1cm. The 

waveguide is filled with air and the operating frequency is 50MHz. Find the 

propagation constant, guide wavelength and cut off frequency for TE10, 

TM11 and TE20 modes

Identify the following conic and hence reduce it in its standard form:

5x2-24xy-5y2+4x+58y-59=0

You are hired by someone to design a charger circuit for his cell phone. Design a cell

phone charger cell phone requires exactly 5V and 2A for one hour

to be completely charged. charging circuit by only using the components listed in Table 1. For circuit design and calculations

purposes, the cell phone can be treated as resistor. Use the symbol of rectangle to show the cell phone in

your circuit.

table 1

Equipment Value Quantity

Resistor 500Ω 15

Capacitor 0.2 F 15

Switch SPST 15

Bulb 2.5W, 0.5A 15

Voltage Sources 1.5V 2

A parallel resonant circuit has a capacitor 100pF in one branch and the impedance of 100 micro Henry plus a a resistance of 10 ohms in another parallel branch, calculate:

(a) resonant frequency 

(b) impendance of the circuit at the resonance and the line current at resonance 

(c) Q-quality factor of the circuitry

4^(×)+4^(×+1)+3=0

Simplify

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