sists of three electromagnets located at 120 rees from each other that induce voltages i rotor windings rotating electromagnet that induces ages in the three stator windings ctions in the same way as an asynchronous erator. quivalent to an eddy-current brake.
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- 1- The compole is used to 2- A 4-pole wave winding machine has ------ magnetic circuit. 3- A commutator pitch for the duplex wave winding is equal to - 4- A 2-pole triplex lap winding will have parallel paths. 5- A 6-pole lap wound generator has 900 conductors. The e.mf induced per one turn being 3V. the generated voltage of the grnerator is ( 6-A 10kW, 250 V shunt generator has armature and field resistance of 0.2 and 502 respectively. Then the generated voltage is andTwo 30 AC generators are such that one has twice the linear dimensions of the other. The field windings of each are excited to give identical sinusoidal air gap flux density waveform. Both have the same number of stator slots and identical winding patterns. The conductors per slot in big generator in K times that of the smaller one. The value of K to get equal no-load voltage at same frequency is (a)8 (b) 8 1 (d) 7 (c) 4Why is it necessary to conduct polarity tests on transformers?
- The internal characteristics of DC shunt generator can be obtained from *The shunt field winding of a shunt generator has a resistance of 80ohms at 20 degrees Celsius. After several hours of continuous operation, the winding temperature rises to 50 degrees Celsius. How much is the winding resistance under this condition. Assume the resistance temperature coefficient of copper to be 0.004 ohm per degree at 0 degree Celsius. *A 100KW generator, 250V, 6 poles have a wave wound armature with 300 turns then the number of compensating winding turns per pole is approximately equal to ----- if the ratio of pole arc/pole pitch * is 0.72
- The shunt generator wave-winding generates induction voltages 60 V at speed 1000 r.p.m and the number of sluts 20 and in each slut 100 conductors . If it is rotating at a speed of 1500 r.p.m to generate a voltage of 80 volts , finding the ratio of the flux . ( The total number of slots equal 40 sluts )An electromagnet has a movable iron part and dimensions of magnetic circuit with uniform cross section as shown in figure. The core is made of ferromagnetic material with relative permeability of 3000: a) b) c) Calculate the magnetic reluctance of the circuit and the inductance of the main winding. Determine the air-gap flux, the flux density and the field intensity of the core and gap. Because of a fault in the power supply, the exciting current is increased to 8 A causing the mobile element of the iron core to move to a zero gap position as a result of the excessive electromagnetic force action. If this movement occurs in 0.01 s, find the transient voltage induced in the test coil having two turns. 0.5 mm air-gap 2 cm 2 A 3 cm 2 cm 60 turns 18 cm test coil 24 cm 0.5 mm air-gapA 4 pole generator with wave wound armature has 52 slots each having 28 conductors. The flux per pole is 0.01 Wb. (i) At what speed must the armature rotate to give an induced EMF of 225V is, (ii) What will be the voltage developed, if the winding is lap connected and the armature rotates at the same speed is, A shunt generator supplies a 25kW load at 205V through cables of resistance, R = 112mQ. If the field winding resistance, Rf =640 and the armature resistance, Ra =55mQ. Determine the following below: The terminal voltage is, The e.m.f. generated in the armature is, Explain the Commutation process in DC machines.
- . A 20 kW compound generator works on full load with terminal voltage of 250 V. The armature, series, and shunt windings have resistances of 0.05-ohm, 0.025 ohm, and 100 ohms, respectively. If the machine is connected short shunt, the emf generated is nearest to. (Our subject is Electrical Machines 1 ) (I need a clear answer and solution. Thank you so much)Consider the following statements regarding the design of the distributed armature winding in a three-phasealternator:1. It reduces the phase belt harmonics.2. It increases utilization of armature iron and copper.3. It increases rigidity and mechanical strength of the winding.4. It reduces copper in the overhand of the winding. Which of the statements are correct? a. 1,3 and 4b. 2,3 and 4c. 1,2 and 3d. 1,2,3 and 4The shunt field winding of a shunt generator has a resistance of 80 ohms at 20⁰C. After several hours of continuous operation, the winding temperature rises to 50⁰C. How much is the winding resistance under this condition, Assume the resistance temperature coefficient of copper to be 0.004 ohm per degree at 0⁰C.