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A four pole syncronous generator has a rotor lenght of 3.9m,diameter of 1.12m, and an air-gap lenght of 6.2cm. The rotor winding consists of 55 turns per pole with a winding factor ofKr=0.89. The peak value of a fundamental air-gap flux densityis limited to 1.0T and the rotor winding current to 2900A.Calculate the maximm torque in newton-meters and power output inmegawatts which can be supplied by the machine under these conditions.
The voltage on bus 1 is 1.0 per unit (pu) at 30 degrees; the voltage on bus 2 is 0.95 per unit at 5 degrees. The reactance connecting bus 1 to bus 2 is 0.5 per unit Ohms, and the resistance is negligible. a)How much real power (pu) is flowing from ..
Current on the surface of inner conductor is 4I going into the page (positive current flows into the page) or is in negative z direction while current on outer conductor surface is 2I in the reverse direction or positive Z- direction. I is the gen..
A three-phase wye-delta transformer is rated 225-kV:24-kV, 400 MVA and has a single-phase equivalent series reactance of 6.08 ohms as referred to its high-voltage terminals. The transformer is supplying a load of 375 MVA
(a) What is the magnitude of the average acceleration of a skier who, starting from rest, reaches a speed of 9.38 m/s when going down a slope for 3.89 s (b) How far does the skier travel in this time
A 3.0 μF capacitor is charged to 40 V and a 5.0 μF capacitor charged to 18 V are connected to each other, with the positive plate of each connected to the negative plate of the other. What is the final charge on the 3.0 μF capacitor
The sampled signal is passed through an ideal LPF which rejects all frequencies above 8 kHz and has a gain Ts. Les sR(t) be the output of the LPF. Sketch LT[sR(t)], in which FT[] denotes the Fourier Transform, in frequency domain.
A permanent magnet commutator motor produces a torque of8 N. m with armature current = 10A. armature R=.16 ohms. if motordrives a load requiring torque of 20 N. m at speed = 1800rpm
If electrons are moving in the presence of an electric field and the field in turned off, do they continue to move or come to rest with zero velocity. When discussing the ganeration of electron/holes pairs by light in semiconductors is it best to ..
Design the electrical system for a shopping center with 500,000 square feet at least 30 spaces of three different sizes (5,000, 10,000 and 25,000 sf). They may be offices, banks, restaurants and shops.
In a series RC circuit, R = 5 Ohms and C = 0.1F. The capacitor voltage is 10 volts at t=0. At t=0, a voltage of 4V is applied. a) Determine the total capacitance voltage and capacitance current as a function time after the external voltage is applied..
A circuit consist of two impedance,Z1=50/_45 ohms and Z2=25/_30 ohms, connected in parallel. They are supplied by a source whose voltage is V=50/_0 volts. Determined follows 1. the current drwan by each impedance
An aluminum cylindrical strain gage load cell is to be specified tomeasure a force of 100,000lbs. The maximum stress in the metal isto be 20,000 psi, the modulus of elasticity is 9.5 x 106psi, and Poisson' ratio is 0.33.
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