Electrical Engineering Problems

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SIBT ENGN150 Dr Saad Odeh Assignment Design Problems – Part 2: (100 marks) This assignment is a class room group work. Each student should submit final copy of this assignment by the end of week 11 in the assignment box located at the SIBT's front office or hand it over during the class. The assessment cover sheet which is available in the unit website must be attached to your assignment. Late assignments will not be accepted. Copying assignment questions from other students, is considered plagiarism and will be rewarded with zero assignment mark. Problem 1 A kitchen ware factory uses an electroplating bath process to plate silver uniformly on kitchen cutlery such as spoons. The electroplating circuit of each spoon requires electric current of 600 A to flow for 20 minutes, so that each coulomb transports 1.2 mg of silver. As a manufacturing engineer you are required to find the weight of silver deposited on 1000 spoons? 1 SIBT ENGN150 Dr Saad Odeh Problem 2 A biomedical engineer is designing a medical device to analyse the protein content of a tissue sample. The procedure uses the electric circuit illustrated in the figure below. The device uses a sample that consists of a gel and a filter paper containing ionized proteins. A voltage source is required to provide 200 Volts across the sample. This voltage moves the ionized proteins from the filter paper to the gel. The current in the sample is given by i ( t ) = 2 + 30 e − at mA Where, (t) is the time elapsed since the beginning of the procedure and (a) is a constant equals to a = 0.85 1 hr Determine the energy supplied by the voltage source when the gel preparation procedure lasts 3 hours. (20 marks) 200 V 200 V 2 SIBT ENGN150 Dr Saad Odeh Q3 An electronics engineer is designing a car fuel gauge similar to the one in the figure. The gauge can be considered as a linear element of a voltage (v) and current (i). Values of the current i and corresponding voltage v of the gauge circuit was measured and tabulated as shown below. You are given the following tasks: (20 marks) 1- Draw the results in the table using Ms Excel and then represent the fuel gauge element by a mathematical model that expresses (V) as a function of (i). 2- Predict the value of v when the current i = 100 mA 3- Predict The value of circuit power when the voltage v = 18 V. V (volts) I (mA) 4- Plot the relation between the resistance and power for this gauge 0.5 2 5 10 12 3 4 4.5 7 12 14 SIBT ENGN150 Dr Saad Odeh Q4 You have been given a task in an energy company to estimate electricity bill of a small flat. The load characteristics and run time of different devices used in that flat is given in the table below. The energy company charges 10 cents per kWh of electricity consumed. You need to find the electricity bill of this house in a period of 30 days. (20 marks) Item name lights Fan TV Refrigerator Washing Machine Number of item 4 2 1 2 1 Power used (W) 20 40 250 300 500 4 Run time (hour/day) 6 5 4 10 1 SIBT ENGN150 Dr Saad Odeh Q5 A renewable energy engineering company is required to setup a preliminary design of a 900W standalone power unit for a communication system. The power unit uses a solar photovoltaic (PV) panel that can produce 120W, at 17.3V and 6.94A at its external terminals. If the maximum current of the communication system is 14A find: - Number of PV panels required to cover the specified system power. - Draw the way of connecting the PV panels and show the voltage and current at the terminal. (20 marks) + 17.3V 6.94A 5
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SIBT
ENGN150
Dr Saad Odeh

Problem 1
Current, I = 600A
Time, t = 20min
Each coulomb transport 1.2 mg of silver
∆𝑄
∆𝑡
Where ∆𝑄 is the charge in coulomb, C and ∆𝑡 is the time in seconds?
𝐼=

∆𝑄 = 𝐼 𝑥 ∆𝑡
∆𝑄 = 600𝐴 𝑥20 min 𝑥 60𝑠/𝑚𝑖𝑛
∆𝑄 = 720,000𝐶
If 1C transports 1.20mg of silver, What about 720,000C
Total weight of silver transported for one spoon:
720,000𝐶 𝑥 1.20𝑚𝑔
𝑊𝑠 =
= 864,000𝑚𝑔
1𝑐
If 864,000g are transported to one spoon, how about 1,000 spoons?
864,000𝑚𝑔 𝑥 1000 𝑠𝑝𝑜𝑜𝑛𝑠
𝑊𝑠1,000 =
= 864,000,000𝑚𝑔
1 𝑠𝑝𝑜𝑜𝑛
1kg = 1,000,000mg
864,000,000mg
Total weight for the 1,000 spoons is 864kg
Problem 2
Voltage source: 200V
Time: 3 hours
a =0.85m...


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