EET-115 Lab 8 - Raceway - PVC Pipe

A. Discuss the arcing phenomenon in a circuit breaker. B. Discuss the types of oil circuit breakers. With references

What is the minimum trade size PVC conduit to contain 201 #12AWG TW75 Copper conductors.

a) Classify the four categories of 3 phase power system faults we experience in our electrical power industry. b) Explain the emergence of such power systems fault as required in (question 1a)? c) Point out each type of fault specified under (a). d) Produce the (1D) design of the three-phase star connected faults stated under(b)

Question A

Answer all the questions 1. Draw a 6-stage cascaded voltage multiplier circuit for high voltage DC generation and explain the working principle. 2. Compare the properties of Solid insulators and liquid dielectrics? 3. Define Basic Insulation Level (BIL) in power systems and Explain the voltage - time relationship with the curve in insulation coordination. 4. What are the three protective methods for surges, explain one method. 5. What are the different types of surge diverters and explain any two methods? 6. A 12-stage impulse voltage generator has a total generator capacitance of C1. The wave front resistance equal to 15000 2 and load capacitance of 2500pF. The wave tail resistance is 30 times of wave front resistance and if rise time is 1.5 µs. Calculate (i) the value of each capacitor of the generator and (ii) the tail time of the impulse wave?

3. The three bus-bar conductors in an outdoor sub-station are supplied by units ofpost insulators. Each unit consists of a stack of 3-pin insulators fixed one on the top of the other. The voltage across the lowest insulator is 8-45 kV and that across the next is 7-25 kV. Find the bus-bar voltage of the station. [38-8 kV]

write down the slection of wiring accessories used in electrical installation

The choice of wiring system design is basically affected by temperature, safety and cost factors, briefly explain these factors.

c.1. Which of the following is one of the three essential functions of an equipment grounding conductor?A. Provide an arc-fault current pathB. Establish groundingC. Establish bondingD. Ensure the system is groundedc.2. What's another name for the three-point method of Earth resistance testing?A. Fall-of-potentialB. Line surgeC. Spatial shieldingD. Leakage current c.3. If the National Electrical Code provides a requirement to ground equipment, it generally implies thatthere will be a direct connection to the Earth of a connection through a/anA. grounding electrode conductor.B. equipment grounding conductor.C. equipotential bonding conductor.D. bonding conductor.

Why Kelvin bridge is used for measurement of low resistance ____________________.   a. due to a large current flow   b. due to power dissipation across the circuit   c. due to contact and lead resistance   d. due to emf source used

Which of the following Surge Diverter use non-linear resistances in its fabrication? Rod - Gape SD. Lightning Arrester SD. Expulsion Tube SD. O All of the above.

The three bus-bar conductors in an outdoor sub-station are supplied by units of post insulators. Each unit consists of a stack of 3-pin insulators fixed one on the top of the other. The voltage across the lowest insulator is 8-45 kV and that across the next is 7-25 kV. Find the bus-bar voltage of the station.

Question 1:a) State why voltage control and cable stranding are necessary in powersystemsb) Briefly explain where and how the following state variables ofa power supply grid are controlled.i) Frequencyii) Active powerili) Reactive poweriv Voltage.

1. What is mean by equipment grounding and system grounding? 2. Discuss any two types of grounding methods.

A DC is supplied through a solid conductor cable. The fault in the cable can be determined by using Murray Loop Test. The healthy cable has the insulation resistance of 1 kilo Ohms per meter. No fault occurred till the first 10 km. The core of healthy cable has the circumference of 7.86cm. If the resistivity of insulation is 900 G Ohm-mm, what is the diameter of the cable.

Airframe Electrical System Question: By what means should aircraft electrical circuits/wires be protected from excessive current? (Source: FAA AC 43.13-1B/2B)

Find the maximum distance between outlets when using #10 Cu THWN copper wire at 240V on a 20A single phase load w/o exceeding a 3 percent voltage drop.     What is considered the maximum. permissible drop for feeders and branch circuits per the NEC recommendation?

7.B. The size of a grounding electrode conductor for a service or separately derived system is generally basedon the size of the largestA. ungrounded supply conductor.B. equipment grounding conductor.C. grounded electrode.D. bonding jumper.7.C. Which of the following statements about bonding is true?A. The joint or termination must offer opposition in the circuit for effective electrical connections.B. Effective bonding keeps impedance high if a fault should occur.C. The entire electrical safety circuit is only as good as its strongest bonded link.D. Bonding connections must endure high levels of fault current until overcurrent protective devices can operate.

[Fill-in-the-blank] in dwelling units shall supply only loads within that dwelling unit or no loads associated only with that dwelling unit. Select one: a. None of these b. Ground-fault protection c. Service-entrance conductors d. Branch circuits

Can we select components voltage references randomly in order to write KVL? Why?

Describe and discuss the electrical load requirements for different types of buildings.

Please answer in typing format solution