why is there a phase shift in rc cct?how do we make it exactily 90 degree?
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why is there a phase shift in rc cct?how do we make it exactily 90 degree?
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- To improve power factor by static capacitor method. If the capacitance per phase is increases, then current taking from supply is Does not change Increases O Doubled O Decreases In synchronous condenser method to increase power factor, synchronous motor is act as capacitive (Capacitor) nature at O No load, rated excitation condition. Full load under excitation condition O No load, under excitation condition. No load, over excitation condition. 0S の ENG 10/CWhich of the following is true in the phasor diagrams drawn according to the ohmic, inductive and capacitive operating states of the round pole synchronous generator a) Due to the voltage Efd, the excitation current is large in capacitive operation and small in ohmic operation b) Due to the voltage Efd, the excitation current is large in ohmic operation and small in inductive operation c) Due to the voltage Efd, the excitation current is small in capacitive operation and large in inductive operation. d) Due to the voltage Efd, the excitation current is large in capacitive operation and small in inductive operation.Q3/ A/ Compare between de series and shunt generator. Q3/ B/ Briefly explain the commutating process in dc machine.
- 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 FalseIllustrate open circuit internal circuit and external characteristic for dc shunt generatorQ) A P-Pole three-phase induction machine with spatial distribution of stator windings is assumed to be sinusoidal A) It is desirable to express the Xs (0m) function for each phase in terms of conductor/radian B) It is desirable to calculate Tag(t,Oe), each phase
- routh stablety method9.09 The flux density distribution in the air-gap of a certain generator is such that it contains a fundamental, a third harmonic, and a fifth harmonic. The flux per pole due to the fundamental distribution is 9 x 10-3 weber, that due to the third harmonic distribution is 0.9 x 10-3 weber, that due to the fifth harmonic distribution is 0.4 x 103 weber. There are four armature slots per phase per pole, the connection are made for three-phase wye. and the coil pitch is 12/15. The frequency is 60 cycles and the generator has 4 poles. (a) Calculate the emf/turn. (b) If there are six turns/coil and two coil sides/slot, calculate the emf per phase. (c) Calculate the emf between line terminals. Ans. 2.32V; 212V; 364VWhich 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?Comment briefly on the relationship between input and output power at varying excitation levels and on the relationship between excitation and power factor or reactive power, when the synchronous machine is connected to an infinite busbarState True or false a- The DC load flow study is a linear analysis b- In a load frequency control, a generator unit equipped with a governor can be assumed to be a controlled unit.