1. What is the reading value of the voltmeter when the excitation circuit is open ?
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Q: 1. What is the reading value of the voltmeter when the excitation circuit is оpen
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Q: 1. What is the reading value of the voltmeter when the excitation circuit is open 1?
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- A 6 pole, 50kW, 500 Volts wave-connected dc compound generator has 492 conductors on its armature.The brushes are shifted by an angle of 9 mechanical degrees to eliminate sparking on the commutatorwhen delivering full-load current. What is the respective cross-magnetizing and demagnetizing amp-turnsper pole?A 220V, 5.5 kW, DC shunt generator has an armature resistance of 0.2 Ω and a total field-circuit resistance of 55 W. The generator is supplying rated current at rated terminal voltage. Answer the following questions relating to this generator and explain your choice of answer. (i) What is the generator armature current? 17 A 21 A 25 A 29 A 33 A (ii) What is the armature internal voltage E0? 2 V 2 V 0 V 0 V 8 V (iii) What is the efficiency of the generator if rotational losses are 300 W? 9% 2% 3% 2% 8% (iv) What is the generator voltage regulation if the terminal voltage rises to 222.2 V when the load (only) is reduced by 50%? Assume a linear regulation characteristic for the shunt generator. 5% 1% 2% 5% 10%To calculate the armature current of a synchronous generator, you do NOT need to know itsA. kilovolt-amperes.B. power factor.C. voltage.D. losses. Note: I have doubts if it is the letter A or the letter D, can you help me in this question, thanks.
- I'm having a difficulty in understanding this Design of Armature (Stator) of AC GENERATOR. PLEASE SHOW THE VERY DETAILED, NO SKIP/SHORTCUT WITH THE UNITS and SYMBOLS so that I can understand. Atleast maximum of 5 decimals. Given: Number of conductors = 29.25 (APPROXIMATE VALUE ONLY) 3 slots per pole per phase, 3-phase, 4 poles. Required: (A) Calculate the slots and slots per pole (B) Calculate the Conductors in each slot (C) Calculate the OFFICIAL VALUE of number of conductors. Final Answer: A. ?, ? B. 6.09 ≈ 6 conductors in each slot C. 48 conductorsWhat is the voltage regulation of a DC generator proportional to?A 500-kw 600-volt 10-pole generator has an armature with 108 slots, 324 com mutator segments, and a simplex-lap winding with a total of 648 conductors. Calculate: (a) the number of conductors per slot; (b) the number of winding elements per coil; (c) the number of turns per winding element; (d) the full-load current per conductor; (e) the current per brush arm
- Excitation circuit internal resistance of a shunt excited DC generator of 150 kW, 250 V, 1350 rpmRf = 10 Ω, armature circuit internal resistance Ra = 0.05 Ω. Excitation to adjust the end voltage of the machineA rheostat of Rreo = 40 has been installed in its circuit. Friction and ventilation losses are neglected.According to this,a) When the entire rheostat in the excitation circuit is activated and the generator is operating under rated conditions,a1) Calculate the load current, excitation and armature currents.a2) Calculate the emf induced in the armature and the power taken from the shaft.a3) Calculate the efficiency with the moment taken from the shaft.b) Spindle revolutions are reduced to n = 1000 rpm. In this case, Va = 250 V and Ea value in (a)What value should the rheostat be adjusted to keep the value found constant? In this new situationCalculate the power given. NOTE:3. In question (a), the excitation rheostat is fully activated. Pay attention to this. NOTE 2:Since a and b…Q/Two dc generators A and B has the following characteristics:GA: rated voltage=150 volt: rated carrent=30Ampere: armature resistance (0.4Ω).GB:no_lond voltage=160Volt: rated carrent=20Ampere: armature resistance=(0.6Ω).The generators are connected in paralled. Draw the circuit diagram, then find:no_load circulating current and no_load voltage?At what carrent the generator B will Be floating? The maximum possible land power6. A 4 pole DC shunt generator with wave wound armature having 390 conductors has tosupply a load of 500 lamps each of 100W at 250 V. Allowing 10 V for the voltage drop inthe connecting leads between the generator and the load and brush drop of 2V. Calculatethe speed at which the generator should be driven. The flux per pole is 30mWb andRa = 0.05 ohms and Rsh = 65 ohms.
- Question 1: Why is the voltage decresed at no-load operation? What is that voltage called? Question 2: Does the voltage increase with the increasing load? Why? Question 3: In which position the voltage decreased with the increasing load? Explain the reason. Question 4: Does the voltage change when a parallel rheostat is connected to the series excitation windings? Explain the reason. Question 5: Sketch the loading curve of the series generator depending on the values recorded.A shunt DC generator has no load terminal voltage of 140V. Armature resistance is 1ohm and shunt field resistance is 50ohms. Calculate: (i) Induced voltage (ii) A load is now connected to the terminals that starts drawing 2A current and terminal voltage drops to 130V. Calculate the new value of the induced voltage Make sure to draw equivalent circuits for (i) and (ii). A 4 pole DC shunt generator with wave wound armature having 390 conductors has to supply a load of 500 lamps each of 100W at 250 V. 10 V for the voltage drop in the connecting leads between the generator and the load and brush drop of 2V. Calculate the speed at which the generator should be driven. The flux per pole is 30mWb and Ra = 0.05 ohms and Rsh = 65 ohms.
