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Problem 1: An overhead line is supported between two towers. The base of Tower A is 185m above sea level and the tower is 25m high. Tower B base is at 200m above sea level and the tower is 35m high. The distance between the towers is 350m. The conductor weight is 32N/m and the tension at the tower is 35kN. At what height above sea level is the lowest point of the conductor, assuming that xW << To so that the approximation y = x2W/2To may be used.
Problem 2: A 400V symmetrical three phase source with grounded neutral supplies a load comprising three impedances in star formation. The impendence have the following values:
Za = 20Ω
Zb = (12 + j5)Ω
Zc = (3 - j4)Ω
Calculate the total active and reactive power supplied to the load both with and without the load star point grounded.
Problem 3: While on a walk in the countryside, you come across a fallen HV conductor which, due to a protection failure, has not tripped. If the HV system is solidly grounded, explain how the fault current presents a danger to you. Would this danger still be present if the system was arc-suppressed?
A marine biologist is monitoring a dolphin swimming in seawater where the speed of sound is 1520 m/s. When the dolphin is swimming directly away at 5.4 m/s, the marine biologist measures the number of clicks occuring per second to be at a frequenc..
In a MOS cascode amplifier, the cascode transistor is required to raise the output resistance by a factor of 40. (1) If the transistor is operated at Vov=0.2V, what must its VA be
figure 1 shows a class a power amplifier. assuming that the base-emitter voltage vbe of the transistor in conduction
design your circuit using only two, three, and four input NAND gates and inverters. try to minimize the number of gates and inverters required. the variables A, B, C, AND D will be available from toggle switches.
Discuss the differences between, advantages and disadvantages of the following types of grounding systems: ungrounded, solidly grounded and high resistance grounded systems.
a voltage is given by v(t)=10sin(1000(pi)(t) + 30 degrees)V 1. use a cosine function to express v(t) in terms of t and the constant pi. find the frequency in hertz to two significant figures and appropriate units.
David is driving at a steady 30 m/s when he passes Tina, who is sitting in her car at rest. Tina begins to accelerate at a steady 2.0 m/s2 at the instant when David passes. How far does Tina drive before passing David
In a circuit, a resistor is only element that has resistance. The generator voltage varies in time, where the amplitude of e max= 1.2 volt and emf freq.= 0.5 Hz , which the max current is equal to the max current when the freq. of emf = 3.0 Hz,
If an ice cream cone is 6 inches tall and its rim has a diameter of 2 inches, determine the weight of ice cream that can fit in the cone assuming the ice cream above the cone is a perfect hemisphere.
The transmitting fiber has a core diameter of 80µm and the receiving fiber has a core diameter of 110µm. The transmitting fiber has n1=1.46 n2=1.40 and the receiving fiber has n1=1.48 and n2=1.46. Will this joint meet the loss restrictions
A 2.0 C charge moves with a velocity of ( 2.0i + 4.0j + 6.0k ) m/s and experiences a magnetic force of ( 4.0i - 20j + 12k ). The x component of the magnetic field is equal to zero. Determine the y component of the magnetic field.
A minority voting circuit makes a decision based on the minority of votes. The logic receives THREE inputs x, y, and z.Together, these input variables are the binary representation ofthe number of members who vote "yes" out of 7 total members.
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