Write a Behavioral model VHDL code that implements an ALU that can perform addition, subtraction, multiplication, shift right, shift left, logical NAND, and logical NOR. Write a VHDL test bench to test the ALU with at least one test vector per operation.

A company plans to purchase a transformer that will be used 12 hours at full load and 12 hours with no load but still connected to the power supply at all times. The transformer has copper losses of 5 kW and core losses of 3.5 kW. Electricity costs $0.07/kW-hr. What is the total cost of transformer losses over a period of 1 year?

A company plans to purchase a transformer that will be used 12 hours at full load and 12 hours with no load but still connected to the power supply at all times. The transformer has copper losses of 5 kW and core losses of 3.5 kW. Electricity costs $0.07/kW-hr. What is the total cost of transformer losses over a period of 1 year?

why differentrial signalling is better then common?

why differential signal cancels inductance?

thanks

An inductor in a switch-mode power supply that operates at a peak current of 8 A needs to store 80 mJ of energy, thereafter release it to a 10 ? load resistor. Suppose this inductor had to be custom designed and built as a solenoid coil wound on a pencil (10 mm diameter) with no magnetic properties. Only one layer of turns is allowed on the pencil’s outer surface, and 0.1-mm diameter enamel coated wire has to be used. Answer the following carefully:

(a) Calculate the required inductance to store the energy.

(b) Draw an isometric sketch of the air-core inductor with only one layer of turns, showing its dimensions and a few turns of wire. Also draw some flux lines.

(c) Calculate the effective cross-sectional flux area of the air-core inductor.

(d) Do 3 iterative calculations to solve the number of turns (tightly wound next to each other) required to achieve the inductance in (a). Comment on your result after each iteration.

Define the following terms related to D/A converter;                                  

            (i) resolution   (ii) accuracy    (iii) settling time         (iv) offset error      (v) gain error

What is the high voltage and insulation tests for transformers ? How we can generate full-wave ,chopped-wave and switching wave voltages in Marx generator for (Lightning and switching impulse tests )?

Butterworth filter

a)Design a 5th order low pass Butterworth low-pass filter with a cut-off frequency of 1592 Hz and a dc gain of 3dB. Find and present the mathematical transfer function of the filter, showing all your steps.

b) Write a Matlab code to plot the magnitude of this function with a linear scale in dB units on the ordinate, and a log scale of frequency on the abscissa.
The plot range should be: ordinate- linear scale from -100dB to +10dB; abscissa- log scale from 1000 rads/sec to 100,000 radians/sec.

For a company that is obliged to employ an electrical and electronic engineer, I would like you to make a risk assessment and include the following topics.

STEP 1: Detect hazards

STEP 2: Identify Risks

STEP 3: Decide on control measures

STEP 4: Complete control measures

STEP 5: Watch and repeat

QUESTION 16

in 1000 words discus the campus’ load profile?

based on the given information or Context below,

Context:

Mookodi Enterprise is a business consultancy with 543 employees. They are based in the north of Johannesburg on a 10Ha campus. Mookodi connects to the national grid at 11kV and pays a seasonal industrial low voltage (LV) tariff of 141.67 cents in summer and 165.94 cents in winter. Thirty percent of Mookodi’s employees are based at their clients’ offices and are not permanently based on the campus.

The campus has the following buildings:

• Canteen (Purple)
• Welcome Centre, Gym and Conference Centre (Green)
• Guardhouse (Light blue)
• Main Office Building 1 (Maroon)
• Main Office Building 2 (Dark blue)

Below is the campus’ electricity consumption over the last year:

i. Explain how to evaluate the correct combination of RL and CL for appropriate filter efficiency. ii. Suggest three (3) alternative designs if the output voltage is to be used to drive electronics with various input voltages. (V

Match the following concepts related to optical switches.