Electrical Engineering Answers

Electronics engineering: FILTERS

Design a 2nd order crossover network with the following specifications:  

• High Pass cutoff frequency = 3100 Hz
• Low Pass cutoff frequency = 310 Hz
• Bandpass frequency = 310Hz to 3100Hz   

A circuit containing Resistance, Inductance and capacitance of 20 ohm, 10mH, 300µF are connected in series respectively ,across a supply voltage of v=100sin100Πt. Find out the expression of current

A: Describe four renewable and four non-renewable energy sources, stating advantages and disadvantages of each system

B: Using the information from Task 4A above, justify the use of different energy sources, include a non-renewable source and renewable source, to provide a nation’s electricity supply. Use your own reasoning and/or other resources like, parliamentary reports, Greenpeace opinions, local opposition groups, national and global economics to support your justification.

The future of different methods and fuels, life span of equipment and actual fuels, cost of fuel production, hazards and environmental impact should be included.

Power stations use different energy sources such as coal, gas, oil, nuclear, hydroelectric, wind farms, tidal and bio mass; choose three from these energy sources. Then compare them in terms of sustainability, perceived safety, cost per megawatt (be approximate), life span and post-service decommissioning.

• Solar cells can be found on a range of items, use the Internet and/or other resources, to describe the basic operation and an application of a solar power source of your choice.

Note: You should include with your description a labelled diagram of a solar panel giving a brief description to how a solar panel works to generate electricity.

• Cells and batteries take many forms and shapes select and describe the characteristic features of two different types of electro-chemical cells or batteries.

Note: You should include with your description a labelled diagram to show how a typical battery is constructed. For the two batteries you have selected above give typical applications they can be used for. Explain how the batteries should be safely disposed and what legislation should be followed.

Design a three-mode temperature control system which inputs error

in 0-4 V range. The output to final control element is 0-8 V. Given:

Kp = 2.4 % per %

Ki = 9 % (%/min)/ %

5

Kd = 0.7 % / (%/min)

An impedance coil whose resistance and inductance are 18 ohms and 3.82 mH, respectively, is connected in parallel with a series combination of a 5.3 uF capacitor and a variable resistor. For what value of resistance will the circuit be in resonance at 1000 cps?

If you can not find a 325-ohm resistor in an electronics store, what can you do with a 300-ohm and 25-ohm resistor to get the resistance you need?

Briefly indicate with the aid of suitable diagrams the difference between meridional and skew ray paths in step index fibers. Derive an expression for the acceptance angle for a skew ray which changes direction by an angle 2y at each reflection in a step index fiber in terms of the fiber NA and y. It may be assumed that ray theory holds for the fiber. A step index fiber with a suitably large core diameter for ray theory considerations has core and cladding refractive indices of 1.44 and 1.42 respectively. Calculate the acceptance angle in air for skew rays which change direction by 150° at each reflection

Draw the block diagram of the GM Superheterodin receiver and describe its operation and the 1015 kHz carrier

Find out what value the local oscillator frequency should get to receive the radio channel with frequency.