A dc shunt generator produces 450 A at 230 volts. The resistance of shunt field and armature winding are 50 ohms and 0.025 ohm respectively. The armature voltage drop will be. (Our subject is Electrical Machines 1 ) (I need a clear answer and solution. Thank you so much)
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- Q2) A wave wound DC generator armature has six - pole and 50 slots. Each slot contains 20 conductors. The required generated voltage is 250 V. a) What would be the speed of the armature, if flux per pole is 0.007 Wb? b) If the armature is rewound as lap formation and run at the same speed you found in part a) above, what will be the generated voltage? The flux per pole is 0.007 Wb.A four-pole Shunt connected generator has a lap connected armature with 728 conductors. The flux per pole is 25mWb. If the generator supplies one hundred incandescence lamp (100V, 60 W). The shunt field and armature resistance are 100 ohms and 0.015 ohms respectively. WHAT IS THE GENERATED VOLTAGE ?Q choose the correct answer: 1-Brushless excitation system consisting of.... a- Stator field winding and power diodes b-stator and rotor field winding and capacitor c- stator and rotor field winding and capacitor d- Everything mentioned in the options 2- Voltage generated per phase in an alternator is proportional to a- Flux per pole b- Number of turns in armature c-Winding factors d- Everything mentioned in the options e- Frequency of waveform 3- If input mech. Power of SG constant, the functionality of AVR is a- Control flux of rotor b-Control terminal voltage c- Control flux and terminal voltage d-Control Load angle
- SOLVE AND SHOW YPUR COMPLETE SOLUTION. ANSWERS SHOULD BE IN TWO DE CIMAL PLACES. The armature of a two-pole dc machine has 30 slots, each slot has 4 conductors each. during its operation, only 75% of the conductors are directly under the pole. each pole measures 2 inches by 3 inches and produces ten million maxwells of flux. the armature core is 12 inches in length and 3.5 inches in diameter. the total resistance of the winding is 2 ohms. a) determine the frequency of the machine when running at 3600 rpm.2- A 4-pole, wave-wound d.c. shunt generator has an armature winding consisting of 300 turns each of 0.0020. The armature resistance is a) 0.152 b)0.62 c) 0.30 d) none of aboveDEGREE: ELECTRICAL ENGINEERING SUBJECT/COURSE: AC MACHINES Answer the following questions (A, B and C) depending on the topic. 1. ALTERNATORS A. Why is it necessary to maintain the speed of an alternator at all times and how do they control the speed of an alternator when in operation? B. Distinguish between half-coiled and full-coiled armature windings in alternators. C. Why are fractional pitch windings generally used in alternators?
- An 8-pole, 600 rpm dc shunt with 778 wave connected armature conductors of 12.5 ohms resistance at a terminal voltage of 250 volts. The armature resistance is 0.25 ohm the shunt field resistance is 250 ohms. Determine the flux per pole? (Our subject is Electrical Machines 1 ) (I need a clear answer and solution. Thank you so much)A 4-pole duplex lap wound armature has 120 slots four conductors per slot. Determine its speed if the flux per pole is 50 mWb and the emf generated is 200 volts. (Our subject is Electrical Machines 1 ) (I need a clear answer and solution. Thank you so much)A 2 pole wave wound dc generator has 44 slots, each slot having 20 conductors. The flux/pole is 0.018 weber. At what speed the armature be rotated to get an induced emf of 220 V. What will be the induced emf developed if the armature winding is lap connected and runs at the same speed. Speed Generated Emf when lap connected
- 3. Two shunt generators operating in parallel given a total output of 600 A. One machine has an armature resistance of 0.02 ohm and a generated voltage of 455 V and the other an armature resistance of 0.025 ohm and a generated voltage of 460 V. Calculate the terminal voltage and the kilowatt output of each machine. Neglect field currents Subject: Electrical Machine 15. Calculate the flux per pole required on full-load for a 50 kW, 400 V, 8-pole, 600 r.p.m. d.c. shunt generator with 256 conductors arranged in a lap-connected winding. The armature winding resistances is 0.1 Ω, the shunt field resistance is 200 Ω and there is a brush contact voltage drop of 1 V at each brush on full-load. Subject Electrical Machine 1A 4 pole , lap wound , d c shunt generator has a useful flux per pole of 0.07 wb. the armature winding consist of 220 turns each of 0.004 ohm resistance . calculate the terminals voltage when running at 900 r.p.m if the armature current is 50 A.