Q The field and armature resistance of a four-pole shunt generator with Lap -connected armature is 50 ohm and 0.lohm respectively, Its supplying a 2400 w load at a terminal voltage of 100V. Calculate the total armature current, the current per armature path and uhe generated emf.
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- A shunt generator supplies a 20kW load at 200V through cables of resistance, R= 100mΩ. If the field winding resistance, Rf =50Ω and the armature resistance, Ra =40mΩ, determine (a) the terminal voltage, and (b) the e.m.f. generated in the armatureQ23) A shunt generator supplies a 20KW load at 200V through cables of resistance, R = 100mΩ. If the field winding resistance ,Rf=50Ω and the armature resistance, Ra=40mΩ, i) Estimate terminal voltage across the load. ii) Calculate the emf generated in the armature.A 20KW, 440V, short shunt compound dc generator has full load efficiency of 87%. If the resistance of the armature and interpoles is 0.4ohm and that of the series and shunt fields 0.25ohm and 240ohms respectively, calculate the combined bearing friction, windage and core loss of the machine A 10 kW 250 volts self-excited generator, when delivering rated load, has an armature-circuit voltage drop of 5% of the terminal voltage and a shunt field current equal to 5% of the rated load current. The resistance of the armature is 0.02 ohm. Calculate the voltage generated and power output.
- Q/ dc shunt generator 4 pole with 500 condcutor , wave running at speed 1000 r.p.m the resistance of armature and field are 0.02 , 55 ohm and delivering load 43.12kwatt at terminal voltage 220 volt, the iron losses is 750 watt 1-Torque developed by the prime mover .........and The torque developed by the armature ........... when running at 1000 r.p.m * 2-The load current ,,,,,,,,,,,,when the speed drops to 800 r.p.m. if If is unchanged ? * 3-Output of the prime motor…….kwatt * 4-Mechanical , electrical and overall efficiency …….. * 5-Flux per pole is......... wb *A DC shunt generator supplies a load of 27 kW at 210 V through the cables of resistance, R = 126 mΩ. If the field winding resistance, Rf = 62 Ω and the armature resistance, Ra = 35 mΩ, Determine (a) the terminal voltage, and (b) the E.m.f. generated in the armature. The terminal voltage is = The E.m.f generated in armature is =A shunt generator supplies a 31kW load at 230V through cables of resistance, R = 122mΩ. If the field winding resistance, Rf =50Ω and the armature resistance, Ra =51mΩ. Determine the following below: The terminal voltage is, Answer and unit for part 1 The e.m.f. generated in the armature is,
- A long shunt cumulative compound dc generator delivers a load current of 60A at 440V. The shunt field resistance , series field resistance and armature resistance are 80, 0.9 and 0.4 respectively. Calculate the induced emf and load resistance.A short shunt compound generator supplies a load of 10 kW at 200 V through a pair of feeder and series field resistance 0.10 ohm. Armature resistance, shunt field resistance and series field resistance are 0.01 ohm, 52.2 ohms and 0.10 ohm, respectively. If the core friction and windage losses amount to 631 watts, the BHP of the driving engine is nearest toA 3 phase, star connected synchronous generator supplies current of 10A having phase angle of 20º lagging at 400V. Find the load angle and the components of armature current Id and Iq if Xd = 10 ohm and Xq = 6.5 ohm Assume armature resistances to be negligible
- A 3 phase 4MVA, 12 kV star connected synchronous generator has Zs= 0.8+J30 ohm. Using circle diagram only, find: 1. The output power developed at unity power factor with excitation equal to 1.25 of rated voltage. 2. The load angle and power factor if the generator supplies (1500 KW) at rated voltage and excitation lequal to (1.2) of rated voltage. 3. Repeat part (2) when .armature resistance is neglectedIt has been determined by test that thesynchronous reactance Xs and armature resistance raof a 2,300-V, 500-VA, three-phase synchronousgenerator are 8.0 and 0.1 Ω, respectively. If themachine is operating at rated load and voltage at apower factor of 0.867 lagging, find the generatedvoltage per phase and the torque angle.Of a shunt excited DC generator, Excitation winding internal resistance Rf = 2.5 Ω Armature winding internal resistance Ra = 0.5 Ω A rheostat has been placed in the excitation circuit to keep the machine's end voltage constant at Va = 30 V. Machine Voltage magnetization induced in the armature while operating at n = 1400 rpm at If = 7 A excitation current It is determined as Ea = 30 V from its characteristic. According to this, a) With peak voltage Va = 30 V, excitation current If = 7 A, power supplied to the load when the speed n = 1400 rpm What is the resistance of the rheostat? b) Spindle revolutions are reduced to n = 1000 rpm. In this case Va = 30 V and Ea = 37 V constant What value should the rheostat be adjusted to keep it? Calculate the power given to the load in this new case.