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A 480-V, 60Hz, 500-hp 0.85-PF-leading eight-pole delta-connected synchronous motor has a synchronous reactance of 0.6 ohms and neglible armature resistance. Ignore its friction, windage and core losses for the purposes of this problem. |Ea| = 480 V when Field Current = 4 A (Assume that |Ea| is directly proportional to the field current).
a.) What is the speed of this motor?
b.) If this motor is initially supplying 500 hp at 0.85 PF lagging, what are Ea and Ia?
c.) How much torque is this motor producing? What is the torque angle? How near is this value to the maximum possible induced torque of the motor for this field current setting?
d.) If field current is increased by 20 percent, what is the new magnitude of the armature current? What is the motor's new power factor
Use the simulation timing diagram to compare the worse case time to do an operation with your ALU with the worst case using the 74LS381. State which operation takes the longest and list the time required for both ALU's.
A causal discrete LTI system is described by y(n)-3/4 y(n-1)+1/8 y(n-2)=x(n) where x(n) is the input and y(n) is the output Find the response of the system if x(n) =u(n)
Attenuation of received power with change in transmission frequency and distance between the antennas
A painter is standing on a work platform that is 27 feet above ground level. For fall protection, the worker''s safety harness D-ring is attached to a 12-foot shock absorbing lanyard that is securely fastened to the structure at a point 40 feet above..
Write the VHDL assignment operator for the Y1 output of a BCD-to-binary encoder. Use Boolean operators, D0-D9 as the data inputs lines and Y0-Y2 for the outputs. Inputs and outputs are active-HIGH.
Three Single-Phase two-winding transformers, each rated 25 MVA, 38.1/3.81 kV, are connected to form a three-phase Wye-Delta bank with a balanced Y-connected resistive load of 0.6 ohms per phase on the low-voltage side.
Consider a coffee counter with a single server at which tired students arrive according to a Poisson process. Let the mean arrival rate be two students per ten minutes and assume the serving time is exponentially distributed with an average of 180..
Create a program using AsmIDE, which utilizes the Fox 11 68HC11 microcontroller board: Speech timer where max time is 5 minutes Use the switches for:
If it is possible to determine whether a circuit is in resonance given only the RMS values, explain how it could be done. If it is not possible, explain what further information you would have to have.
An office building is billed based on the rate structure given in Table 5.3 (Energy charges is $0.0732/KWh and demand charge is $9 / mo-kw. As a money saving strategy, during the 21 days per month that the office is occupied
An AM broadcast receiver's pre-selector has a total effective Q of 90 to a received signal at 1180 kHz and uses an IF of 455 kHz. Calculate the image frequency and its dB of suppression.
Implement switching function of 4 variables H(A,B,C,D)= AB'+BC+A'CD using a 4 to 1 Multiplexer and any number of 2 to 1 multiplexer. One can select any 2 variables (for example, AB or CD) as select inputs of one 4 to 1 multiplexer.
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