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Home Question Bank Engineering Archive 2025 January 15

Engineering Questions from Jan 15,2025

Browse the Engineering Q&A Archive for Jan 15,2025, featuring a collection of homework questions and answers from this day. Find detailed solutions to enhance your understanding.

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SECTION B (Q4-Q6) Q5(a) Compare between distributed and centralised grids. [5] Q5(b) A homeowner is considering a rooftop installation of a solar PV system to offset a part of his grid energy cost. The total surface area of the rooftop is \( 400 \mathrm{~m}^{2} \). (i) Determine the system maximum installed capacity in kW if the only available [6] solar PV modules are 100W with dimensions of ( \( 1.3 \mathrm{~m} \times 2.1 \mathrm{~m} \) ). (ii) If the daily total solar irradiation for the site where the homeowner plans to [5] set up a solar PV system is \( 4.5 \mathrm{kWh} / \mathbf{m}^{2} \). Using this information and considering a conversion efficiency of \( 21 \% \), calculate the expected annual energy from the projected solar PV system. Q5(c) For a typical wind turbine: (i) What does the power coefficient, \( C_{p} \), indicate and what is its theoretical [5] maximum value? (ii) Explain why \( C_{p} \) is zero when \( \lambda=0 \) and \( \lambda=12 \) ? [4] Total [25] e. Produire le circuit numérique correspondant aux equations alged suivantes: \[ F 1=a \cdot b \cdot d \cdot e+a \cdot b \cdot \bar{e}+a \cdot c \cdot \bar{d}+b \cdot \bar{c} \cdot \bar{d}+\bar{b} \cdot \bar{d} \] \[ F 2=(a+\bar{b}) \cdot(\bar{a}+b) \cdot(\bar{a}+\bar{b}) \] \( f \). Enregistrer votre travail et déposez le sur la plateforme. e. Produire le circuit numérique correspondant aux équations algébriques suivantes: \[ F 1=a \cdot b \cdot d \cdot e+a, b \cdot \bar{e}+a \cdot c \cdot \bar{d}+b \cdot \bar{c} \cdot \bar{d}+\bar{b} \cdot \bar{d} \] \[ F 2=(a+\bar{b}) \cdot(\bar{a}+b) \cdot(\bar{a}+\bar{b}) \] 3) Explain the construction and working of an SCR. (6 marks) b) Explain forward blocioing and conduction mode of operation of SCR ( 5 marks) c) Draw the V-I characteristics and explain how gate current affects switching of SCRs ( 5 marikt) d) Using equivalent circuit for UJT, derive the expression for intrinsic standoff ratio (4 marks) QUESTION FOUR (20 MARKS) a) Explain the procedure involvedi in troubleshooting of medical electronic gadgets (4 mardes) b) Discuss how electronic component fatlures can be avoided (4 marks) a) Define the following terms as used in power semiconductor devices Breakover voltage ii. Peak reverse voltage [PRV) b) Briefly explain how electrical stress failures occur and their remedies c) explain safety test carried out on medical electronic equipment d) Describe how parametric amplifiers work c) Highlifht factors affecting electronic component's reliability f) Discuss common failures on electronic capacitors Do the work for this problem clearly on scratch paper. 3 You MUST show this work in the photo/pdf on the final question on this quiz. (See the last question for details) 6 The answer here will count for only 2 marks. Your correct work in the photo will count for an additional 2 marks. Fan Affinity Problem: A pump system has is rated at POWERold \( =900 \) Watts \( (\mathrm{W}) \) and has an RPMold \( = \) 600. If the power is increased to POWERnew \( =1800 \mathrm{~W} \), what will the new shaft speed RPMnew be? Fan affinity law for power and shaft speed. \[ \frac{P O W E R_{\text {old }}}{P O W E R_{\text {new }}}=\frac{\left(R P M_{\text {old }}\right)^{3}}{\left(R P M_{\text {new }}\right)^{3}} \] State your answer to the nearest whole number. Do not worry about units in this question. Your Answer: Answer
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