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Two identical 138 kV Y: 13.8 kV DELTA 100 MVA tap changing transformer each with a per unit series impedance of j.1 ohms are operating in parallel and supplying a 180 MVA load at 13.8 kV and .8 lagging pf. Transformer 1 has its primary tap in the 138 kV position and transformer 2 has its primary tap in the 134 kV position. Find the line currents in per unit and in amperes flowing on the load side from each transformer
A terminated transmission line with Z0 = 60 ohm has a reflection coefficient at the load of = 0.4 60. (a) What is the load impedance (b) What is the reflection coefficient 0.3 away from the load (c) What is the input impedance at this point
A Y-connected load with an impedance of 12-j15 Ohms per phase is connected to a balanced Delta-connected 208V, 60Hz, three-phase, positive phase-sequence supply. Determine 1) the line and phase voltage, 2) the line and phase current
A current source of value 2cos(2t) A is used to power a string of 2W lightbulbs. If you wanted to replace this current source with a DC one, but have the same power drop, what DC current should you apply (one decimal place needed)
A sinusoidal voltage has maximum amplitude of 90 V. The voltage passes through one complete cycle in 64 ms. What is the frequency of the voltage in hertz
A person shuffling across a dry carpet can be approximately modeled as a charged100-pF capacitance with one end grounded. If the person touches a grounded metallic object such as a water faucet.
There are to be 15 states, and the device for utilization is a 22v10 chip using 8 flip flops internal to the device. The outputs are 8 LEDs and a secondary output Z that is a 1 if states 10,11,12,13 are active.
a). Find the resistance of the aluminum wire 1 m long and 1 mm in diameter. For aluminum, resistivity is 2.8e-6 ohm-cm. b). What is the voltage drop across the wire for a current of 1 A The strength of the electric field inside the wire
As speed increases, the lower lamp, L1 lights, then L1 and L2, then, L1, L2, and L3, until all lamps light at the highest speed. Once all the lamps illuminate, no further increase in speed will have any effect on the display.
What are the respective advantages and disadvantages of the asynchronous and synchronous communication modes from a reliability perspective?
Consider the best possible heat engine working in air at 25°C. The engine continuously converts heat from a source at 300°C to work, and heat is continuously transferred into the engine at a rate of 100 kJ/s.
Calculate the S/N ratio for a receiver output of 4 V signal and 0.48 V noise both as a ratio and in decibel form. (69.44, 18.42dB)
The manufacturer of commercial jets has a cost index equal to 94.9 per aircraft in 2009. the anticipated cost index for the airplane in 2014 is 106.8. the avaerage compound rate of growth should hold steady for the next 15 years.
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