Conduct a literature review on the electrostatic theory and its application to systems. Students should understand the underlying principle in solving magnetostatic field problems to answer the following question.

1. What is the law or equation employed in (linear) magnetostatic field problems?
2. Is Poisson’s equation applicable in solving magnetostatic problems?

Design a synchronous counter of four-bit using D flip‐flops and gates (AND, OR etc.)

*use verilog language modules and test and explain briefly

Two advantages for full mesh over shared medium Two disadvantages for full mesh over shared medium.

Outline what a MAC protocol is and why it is used for shared medium case

se the Laplace transform to solve the given initial-value problem. y'' − 6y' = 10e^5t − 5e^−t, y(0) = 1, y'(0) = −1

How does a diode affect an AC signal?

The magnetic flux density in a region of free space is given by B = −x² ax + 2y³ ay − 2z az T. Find the total force on the rectangular loop shown which lies in the plane y = 0 and is bounded by x = 1, x = 3, Z= 2, and Z= 5, all dimensions in cm. The current is 30 ampere in anticlockwise direction.

Design a microcomputer system using a uP 8086 10 Mhz. This system must have a Coprocessor 8087, a parallel connector, a serial connector, ADC and DAC connector for data conversion, a 16 byte seven segment display, a 64-key matrix keyboard, a USB connector thru a DMA for high speed data transfer. A special connector to connect a printer. The system must have an interrupt controller to handle all the I/O interface. The main memory size will be 1 Mbyte.

Show all the diagrams needed to construct your design including all the I/O interface and devices connected, show a memory map and the type of memory you will need for you design including the configuration and decoding system. You must include the programming needed for set up the complete system. Use pseudo code for each driver and program each of the interface needed.

1. What is the main concept of operating DC-AC converters ?
2. List 3 different methods for eliminating or reducing the output harmonics in inverters.
3. What is the major challenge for operating an inverter ?
4. What is blanking time, and why is it important in operating any inverter ?
5. Briefly explain the basic concept of PWM technique for 1phase inverters.
6. Output filters in inverters suffer from a main functional limitation, what is this limitation?

Q) design and analyze a current limited series voltage regulator that includes op amp and 8V zener diode . The regulated output voltage should be 40V and the output current should be limited to 800mA . The zener current should be 9mA when Vi = 35V.
(solve neatly)

Given the following four numbers:
(a) 01101010 (b) 11110001 (c) 10001000 (d) 00100010
Question:
(i) Perform (a) + (b) in the 2’s complement form.
(ii) Perform (d) – (c) in the 2’s complement form.
(iii) Multiply (a) by (b) in the 2’s complement form.
(iv) Divide (c) by (d) in the 2’s complement form.

Assume a transmission line with ZL = 100 − j25Ω and Z0 = 50Ω. Using the smith chart, find i) the normalised load impedance; ii) the corresponding reflection coefficient; iii)
the standing wave ratio; iv) the distance between the load and the first voltage maximum; v)
the distance between the load and the first voltage minimum; vi) the normalised admittance;
vii) the input impedance at 0.2λ from the load. (Show all steps on the Smith chart)

Draw an electrical door warning control circuit for the aircraft toilet "Vacant" (red light) and "In-use" (green light) sign.

The circuit components must include (but are not limited to) the following:
1. a 24 VDC supply,

2. switch(es),

3. relay(s),

4. 2 x 1 kΩ resistors,

5. 2 LEDs (a RED and a GREEN), and

6. earth/ground.

Circuit operation:
The main voltage source is supplied from a 115 VAC generator. A resistor is individually connected to each LED lights that limits the current flow. The turning ON/OFF of the "Vacant" and "In-use" sign is controlled by a SPDT micro switch which allows only one LED to be lighted.

1. Using behavioral VHDL, design a Moore-type finite state machine that detects input test vector that contains the sequence of ‘100’. If the sequence ‘100’ is detected, the output Z should go high. The input is to be named W, the output is to be named Z, a Clock input is to be used and an active low reset signal (Resetn) should asynchronously reset the machine.

a) Draw the Moore-type model state diagram for the FSM.

b) Write the VHDL code to implement the FSM.

Signals and systems

Find the complex exponential Fourier series for the following signals. In each case plot the magnitude and phase line spectra for k ≥ 0.

(i) x1(t) = cos(5t + 45o )

(ii) x2(t) = sin2 (t)

(iii) x3(t) = cos(3t) + cos(5t)]