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Three single-phase two-winding transformers, each rated 25 MVA, 34.5/13.8 kV, are connected to form a three-phase bank. Balance positive-sequence voltages are applied the high voltage terminals, and a balanced, resistive Y load connected to the low-voltage terminals absorbs 75 MW at 13.8 kV. If one of the single-phase transformers is removed (resulting in an open- conection) and the balanced load is simultaneously reduced to 43.3 MW (57.7% of the original value), determine:
(a) the load voltages Van, Vbn and Vcn (in polar coordinates)(b) load currents Ia, Ib, and Ic (in polar coordinate)(c) the MVA supplied by each of the remaining two transformers. (in polar coordinates) Are balanced voltages still applied to the load? Is the open transformer overloaded?
In a certain system, an electrical heating element was found to increase the temperature of a piece of metal 7o for each amp of current. The metal expands 0.004 in./deg and pushes on a load sensor that outputs 1 V/0.003 in.
A particle travels along the x-axis with postion ( measured in meters ) as a function of time ( measured in seconds ): x(t) = 5t^2-7t+2. (a) At what time or times is the particle at rest
Consider the convolutional code described by connection polynomials
A cam is to be desinged for an automated part loader.Using the motion equations,construct a chart that tabulates follower displacement versus time and cam rotation. Also plot this data when the prescribed motion for this application.
B.) Write an equation for v(t) for t > 0 C.) Write an equation for the power absorbed by resistor for t >= 0 D.) Find how much energy the resistor disspates for t >= 0 E.) How much energy is stored in capacitor at t=0
Determine experimentally the value of a resistor that when placed across the battery will make a measurable change in measured battery voltage. Keep the voltage decrease from open circuit value to 10% or less.
A dc series motor of 230 V, 12 hp, 1200 rpm is connected to a 230 V supply. It draws a current of 40 A, and rotates at 1200 rpm. Ra = 0.25 ohms and Rs = 0.1 ohms. Assume magnetic linearity.
A block error detecting code has a minimum distance of three. How many errors can this code detect and how many can it correct
The practical voltage source is formed by combining an ideal voltage source (Vs) and internal resistance (r). 1) Without computing, determine sign of power Ps delivered by voltage source
Dispense requested amount using least number of bills, Write a C program for an automatic teller machine that dispenses money. The user should enter the amount desired (a multiple of 10 dollars)
Briefly discuss the source of solar energy and the processes involved by which the earth receive 5.7kWh/m^2/day over the entire surface. If it becomes possible to simulate the same process on earth
Write a main program to call a procedure that converts the Fahrenheit temperature value stored in the location labeled TdegF to its Celsius equivalent. The range of temperatures is 32F to 212F. The procedure stores the converted temperature in loc..
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