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- A short-shunt compound generator supplies a load of 10kW at 200V through a pair of feeder resistance 0.10, armature resistance is 0.010 and the shunt field resistance is 52.50 and the series field resistance is 0.102. If the SPL amounts to 631W, determine d) Electrical η ( 87.96% ) e) Commercial η. (83.33%)9. An 11-kV, three-phase wye-connected generator has a synchronous impedance of 6-ohms per phase and negligible armature resistance. For a given field current, the open circuit voltage is 12kV. Calculate the armature current for the maximum power condition. Ans: 1566.4 AA compound dc generator is supplying a load of 120A and 120V. The shunt field,series field and armature resistances are 32 ohms 0.07 ohms and 0.1 ohms respectively. Find the generated voltage in LONG SHUNT CONNECTION and SHORT SHUNT Connection NOTE: DRAW THE EQUIVALENT CIRCUIT DIAGRAM
- A long shunt compound de generator delivers a load current of 70 A at 384 V and has armature, series field and shunt field resistances of 0.098 ohms, 0.026 ohms, and 264 ohms, respectively. Calculate the armature current in ampere.A polyphase system is generated by______? a.Both a and c b.Having two or more generator windings separated by equal electrical angle c.Having generator windings at equal distances d.None of theseA short-shunt connected compound DC generator delivers 219 A to a load at 250 V. Its shunt-field resistance is 26.8Ω, its shunt-field rheostat resistance is 6.2Ω, its series-field resistance is 0.042Ω, and its armature resistance is 0.096Ω. Find the copper losses in ... A) the shunt-field winding, a) 382.5 W b) 1653.4 W c) 2014.36 W d) none of the above B) the shunt-field rheostat, a)382.5W, b)2014.36, c)4940.25W, d) none C) the series field, a)382.5W, b)1653.4W, c)2014.36, d) none D) the armature winding, a) 382.5W, b)2014.36W, c)4940.25W, d) none
- 2.2 A three-phase synchronous generator has a reactance of 1.5 p.. and negligible resistance. It supplies a rated current of 1.0 p.. at 1.0 p.u. terminal voltage to a lagging load of 0.9 power factor. Determine the rated excitation voltage in p.u. and the internal load angle. Construct the performance chart of the generator in 2.1 (above) assuming its rating is 450 MVA.380 V, 50 Hz, 2p = 6, star connected induction motor impedance in ohms per phase values:R1 = 0.3, X1 = j0.45, R2 = 0.15, X2 = j0.45, Xm = j15Its total mechanical losses are 500W. Core losses are negligible. For a rotor slip of 0.01 at rated voltage, calculate the following:a. Input currentb. power factorc. rotor frequencyA long shunt generator delivers 25kW at 220V. The shunt, series and armature resistances are 50ohms, 0.02ohms, and 0.05ohms respectively, calculate the generated emf.
- Problem: A short-shunt compound generator has armature, shunt field and series field resistances of 0.5 Ω, 156 Ω, and 0.465 Ω respectively. If it supplies a load of 9 kW at a terminal voltage of 241 V, calculate the generated emf in volt. *Four decimal placesA long shunt compound generator delivers 100A, 250V at rated load. The resistances of the various windings are: Ra=0.1-ohm, Rip=0.02 ohm, Rsh=100 ohm and Rse= 0.025 ohm. If the stray power losses amount to 1.8kW solve for the overall efficiency of the generatorIn a Three-phase alternator, a given field current produces an armature current of 250 A on short-circuit and a generated e.m.f. of 1500 V on open-circuit. Calculate the terminal p.d. when a load of 250 A at 6.6 kV and 0.8 p.f. lagging is switched off. Calculate also the regulation of the alternator at the given load. Subject: Electrical engineering