Explain the electrical scenarios briefly 1. Aluminum Wiring
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Explain the electrical scenarios briefly
1. Aluminum Wiring
2. Over-lamping
3. High electricity bill
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Solved in 2 steps
- 1. The terms “open-circuit", “short circuit" and “dead short" are used in speaking electricity. Answer the following questions about these three terms: a. What is the value of the resistance of an open circuit? b. What is the value of the resistance of a short circuit? c. What is meant by a “dead short"? 5 DDPasalo-Electrical Engineering Department COE MMSU EE 121: Electrical Circuits I 2. When a switch is open, is the resistance between its terminals high or low? ¸Low 3. What is the resistance of a closed switch (ideally)? 4. Using each of the methods shown in (a) and (b) below, calculate the value of the equivalent resistance of a combination of R1 = 5 ohms and R2 = 20 ohms connected in parallel a. Using the equation: 1/Requivalent = 1/R, + 1/R2 + 1/R3 = b. Using the equation: Requivalent = (R, x R2) / (R, + R2) = Ωh.1. In an alternating-current system, the maximum size for a copper grounding electrode conductor isA. 250 kcmil.B. 3/0.C. 500 kcmil.D. 4/0. h.2. The figure shows a fault condition in an ungrounded electrical system. Which of the following will occurbecause of the fault in this system?A. Only the overcurrent protector at Point A will trip open.B. The ground fault will heavily damage the service.C. Nothing will happen until a second ground fault occurs.D. The overcurrent protection will trip, shutting off all the line side power.A. Discuss the arcing phenomenon in a circuit breaker. B. Discuss the types of oil circuit breakers. With references
- Load in Figure 1 needs to be connected to Mains Switch Board (MSB) using multicore PVC cable. As a maintenance engineer, you need to proposed cable size for the load, Determine the following issues. 1) Calculate current demand for the circuit. 1) Detemine suitable MCCB (Model and nominal current rating) should be used to protect the load against over-current. im Propose suitable cable size for the load in Figure 1. iv) Calculate voltage drop of the proposed cable WITHOUT consider the cable reactance and voltage drop correction due to higher cable operating temperature v) Calculate voltage drop of the proposed cable BY consider the cable reactance and voltage drop correction due to higher cable operatıng temperature vi) If the multicore PVC eable is change into 3 single core PVC cables, what the suitable cable size. All other multicore cables not available. (25 + variable x) m (A) 30 m (B) (15 + variable b) m (C) Multicore PVC cable MCCB 95 kW. (400 + variable y) V. 0.85 p.f. Load MSB…Describe and discuss the electrical load requirements for different types of buildings.C1 Define circuit breaker and write any two types. (b) C1 Write the types of power factor improvement. (C) C2 Write any four methods of voltage control. (a)
- 9. What is the minimum ampacity of the wire that can be used for a 30A branch circuit? a. 30A b. 20A c. 25A d. 40AThe internal resistance of an ideal voltage source is _____. * A. Infinite B. Equal to the load resistance C. Zero D. To be determinedCalculate the following. a) Expected voltage at “A” with switch SW1 open. b) Expected voltage at “A” with switch SW1 closed.
- Define the terms "load shedding" and "load balancing" in the context of electrical power systems.Ohm's Law states that the electric current flowing though a ________ is directly proportional to the ________. Select one: a. closed circuit --- total resistance b. closed circuit --- switch resistance c. open circuit --- supply voltage d. closed circuit --- supply voltage1. The practical unit of electric charge. ____________ 2. A path for the current to flow. ______________ 3. DC Voltage has ________ polarity 4. Resistance to current flow in AC circuits, measured in ohms. ____________ 5-7. Types of grounds in electrical/electronics circuits. (5) ______________ (6) ______________ (7) ______________ 8. Also known as Ohm’s Law. ________________