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A 3-phase synchronous generator rated at 75 MVA, 13.8 kV (L-L) is connected to a power system that has a Thevenin equivalent of j0.23 per unit at 1.0 per unit voltage. The synchronous reactance of the generator is j1.35 per unit. (Neglect armature resistance). Both per unit impedances were calculated on the base MVA rating of the generator .
a) Determine the maximum power in MW transferred to the system when the internal voltage (Eaf) of the generator is 1.10 pu.
b) Assuming that the generator is being operated with constant excitation, determine the power transferred to the system in MW when the power angle (δ) is adjusted to 30° and the Thevenin equivalent voltage drops to 0.9 per unit.
Design a voltage regulator circuit that provide a voltage at a maximum of 100 mA from a 6V battery. A maximum of 1W of power should be dissipated in any one component.
A speaker can be modeled as an inductor LS (the coil that generates the magnetic field to move the speaker diaphragm) in series with a resistor RS (resistance associated with the coil wire, as well as the energy lost to the acoustic output the spe..
What are the drawbacks to developing resources offshore?
a) What current will flow in the diode if the forward voltage bias is raised to 0.8V b) What current will flow in the diode if the forward voltage bias is lowered to 0.6V c) What change in forward bias voltage will increase the diode current by a ..
1. How much power reaches the receiving antenna 2. What is the EIRP in the direction of maximum transmitter antenna gain 3. What is the power density around the receiving antenna 4. What is the electric field intensity around the receiving antenna
Create 2 equations with 2 unknown variables. For example, one equation would be ax + by = c and the other equation would be dx + ey = f where x and y are the variables and a, b, d, and e are coefficients for the variables and c and f are numbers.
Find the characteristics equation and the corresponding roots for the following ODEs and identify its case a) y" + 6Y' + 9y=0 b) 10y" + 18y' +5.6y=0 c) 10y" + 50y' + 65y =0 Slove the intial value problem a) problem 2a) with y(0)=2 and y'(0)=-5
a) Find the intersection of the two lines. b) Find two vectors that also describe the two lines originating from the intersection. c) Find the angle between the two lines.
Describe the steps in the keypad polling routine. Draw a flow chart for the keypad LCD software code. Discuss challenges experienced in developing the keypad LCD software code.
The power consumption of a single-phase electric load fed froma 120V source is represented by: P(t)=100 (1-e-t/10)KW where t is the unit of time inhours. compute the energy consumed by the load over the period of 24 hours.
Which is the best alternative to buying a machine assuming an interest rate of 4% and a time span of 6 years. Compare using Present Values. A: Buy new machines for $25k. They earn $5k per year and their maintenance costs are $125 per year.
Two batteries with 1.8 voltage and 10.5 Ohm internal resistance each are connected in series. This battery pack is used to boot a small electric motor with 275 Ohm resistance. Find the power delivered to the motor.
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