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A 6 pole round rotor 3 phase star connected synchronous machine has the following test results:Open circuit test: 4000 V line to line at 1000 rev/min, 50 A rotor currentShort circuit test: 300 A at 500 rev/min, 50 A rotor currentNeglect the stator resistance and core losses, and assuming a linear open circuit characteristic, calculate:(a) the machine synchronous reactance at 50 Hz,(b) the rotor current required for the machine to operate as a motor at 0.8 power factor leading from a supply of 3.3 kV line to line with an output power of 1000 kW,(c) the rotor current required for the machine to operate as a generator on an infinite bus of 3.3 kV line to line when delivering 1500 kVA at 0.8 power factor lagging,(d) the load angle for (b) and (c), and sketch the phasor diagram for (b) and (c).
a) By applying Kirchoff's voltage law to the output (DC) circuit loop determine the DC Load Line, i.e. an expression relating Id to Vds. Comment briefly on the significance on the result, with respect to the slope and x-axis intercept.
Magnitude bode plot for any given transfer function Can some one teach me an easy way to make a bode plot for any given transfer function magnitude only (not phase).
A tree-phase, 60Hz, 5MVA synchronous generator has balanced line-to-line voltages of 8320V at its terminals. if the generator is supplying power to delta-connected, balanced load of 5MVA at a 0.8 lagging power factor
The voltage across the load must remain between 4.7 and 5.0 V for all values of load current. Come up with (draw) a voltage-divider network to supply the load. You may assume that resistors of any value desired are available.
Find all values of alpha such that the system is stable for K = 2. If the unity feedback closes around this G(s) and an input is a unit step r(t) = 1u(t), what is the stead-state error, e_ss, as a function of alpha and K?
What is the frequency of the rotor currents? What is the angular velocity of the stator field with respect to the stator? With respect to the rotor?
The internet connection speed at any time from your home can depend on the amount of overall internet trac at that time. Let the random variable X denote the speed of connection in megabits per second (MBPS).
Calculate the amount of work done if the process is considered to be polytropic. Assume the temperature to be 273K and the value of k for the process to be 1.4. All losses are neglected.
A PN junction has Na=10^19 cm^-3 and Nd= 10^16 cm^-3. a) with V=0 what are the minority carrier densities at the depletion region edges Assume V= 0.6 V for (b)-(d). b) What are the minority carrier densities at the depletion region edges
Suppose you are to construct a logic circuit with inputs {A,B,C} and output {F} The logic is such that "F" is asserted only when "A" or "B" are asserted and "C" is not. First draw and complete the truth table
What are the positive and negative implications of wireless energy?
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