The reactance of the synchronous generator after sometime of the fault cleared is ............
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A: True
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The reactance of the synchronous generator after sometime of the fault cleared is ............
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- In 2-pole machines: the wave winding have greater generated voltage than *.the lap winding armatures True False *.For high rotating speed machines the number of poles must be Little True False The reactance voltage is added in the coil undergoing commutation to * reduce the spark True FalseThe amplitude of the sinusoidal symmetrical ac component of the three-phase short-circuit current of an unloaded synchronous machine decreases from a high initial value to a lower steady-state value, going periods through the stages of __________ and ________ periods.Generate a conclusion on this following statements: Determine and analyze the voltage regulation characteristics of the alternator with resistive, capacitive, and inductive loading.
- Sketch a single-phase voltage sag event and explain its characteristics. List three potential causes of voltage sags.In the field circuit model of a DC machine, a variable _____ is usually inserted in series with the field winding to vary/control the _____ that flows through that circuit. A resistor, voltage B resistor, current C inductor, current D inductor, voltageWhich of the following is more likely to cause problems with motors? a) positive sequence harmonics, b) negative sequence harmonics, c) either a or b, d) neither a nor b in a inductive circuit, does the inductance have any effect on the flow of steady current? a) yes , b) no The rotating part of the revolving-field design alternator is called the rotor. a)true, b) false
- A 80 MVA synchronous generator has Xs = j8Ω. The generator is supplying itsrated power to an infinite bus at a voltage of 33KV and a power factor of 0.9lagging.Determine the following:a) The generator emf (E) and the power angle.b) The maximum power (Pmax) that the generator can supply and the armaturecurrent (Ia) in this case (i.e. when the power is maximum) and what is thepower factor?What is the main direct cause of reactive power in AC system?A. Resistance of transmission linesB. Inductance and capacitance in the loadsC. Ideal transformer connected in the systemD. Power produced by generatorDraw the per-phase equivalent circuit of a three-phase squirrel-cage induction machine. List all of the elements in the equivalent circuit and briefly state their function
- The step down DC chopper uses DC source voltage V(dc) = 200 V and resistive load impedance of 10 ohm. The duty cycle is 0.4 the voltage drop across the switch may be taken as zero, Calculate : (a) Average and RMS value of output voltage. (b) Average and RMS value of output current.8 If we model each winding of a three-phase motor like the circuit shown in Figure P7.68(a) and connect the windings as shown in Figure P7.68(b), we have the three-phase circuit shown in Figure P7.68 (c). The motor can be constructed so that R1 =R2 = R3 and L1 = L2 = L3, as is the usual case. If we connect the motor as shown in Figure P7.68(c), find the currents ÎR, İw, İg, and În, assuming that the resistances are 40 2 each and each inductance is 5 mH. The frequency of each of the sources is 60 Hz.The .. of the hysteresis loop is a measure of energy ..... lost per cycle a) area. b) Type. c) Frequency d) No one of the above. Fringing effect is a phenomena occurs in . a) Transformers. b) Electrical field. c) Air gap d) All of the above.