Open circuit characteristic of a d.c. generator gives relation between * V and If E and la V and la EO and If If, in a 3-p alternator, a field current of 50A produces a full-load armature current of 200 A on short-circuit and 1730 V on open circuit, then its synchronous impedance is . ohm. O 4 34.6 8.66
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Q: 4- Is there a great difference between long and short shunt compound generator, show that?
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Q: 4. Is there a great difference between long and short shunt compound generator, show that?
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- 3- A 3-phase, 8-pole, star-connected alternator has 72 slots on the armature. Each slot has 12 conductors and winding is short chorded by 2 slots. Find distributed factor and pitch factor? Note : w.r.t. mean (with respect to)6. A 3-phase, star-connected alternator has a resistance of 0.52/phase and a synchronous reactance of 52/phase. It is excited to give 6600 V (line) on open circuit. Determine the terminal voltage and voltage regulation on full-load current of 130 A when the load p.f. is (a) 0.8 lagging (b) 0.6 leading. (Ans. (a) 3340 V (phase value); 14.1% (b) 4260 V (phase value); - 10.6%)In 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
- What are the conditions in paralleling of these DC Generators:a. Shuntb. Seriesc. CompoundA three-phase 3300V. 50 Hz star-connected alternator has an effective resistance of 0.5 ohm/phase. A field current to of 30A produces full-load current of 180A on short- circit and a line to line emf of 1000V on open circit Determine(i) the power angle of the alternator when it delivers full-load at 0.8p.f(lag) (ii)the SCR of the alternator Db) Two alternators are connected in parallel to feed a load together. The no-load frequency of the first alternator is 51.5 Hz and its slope is 1MW / Hz. The no-load frequency of the second alternator is 51.0 Hz and its slope is 1MW / Hz. The total power of the load fed by these two alternators is 2.5MW and the power factor is 0.8. Accordingly, at what frequency does this system work and what are the power values transferred to the load by each alternator.
- Generate a conclusion on this following statements: Determine and analyze the voltage regulation characteristics of the alternator with resistive, capacitive, and inductive loading.A 3-phase, 16 pole alternator has a star connected winding with 144 slot and 10 conductor per slot. The flux per pole is 30 mWb sinusoidally distributed and the speed is 375 rpm. The frequency of generated emf is? Also find, the line emf is?Section [Section Upload answer sheets Find the following parameters of an ac voltage given by the equation v-100sin370t.Find RMS value,form factor, peak factor, average value and frequency. E Submission
- b) Explain the conditions of parallel connection of alternators and how these conditions are fulfilled.A 5-ohm resistor is connected in series with a 25 micro-farad capacitor. A source voltage of158 volts, 50 Hz supplies the combination. Determine the following:a. Circulating currentb. Voltage across the resistorc. Voltage across the capacitord. Real power supplied by the sourceThe step down DC chopper uses DC source voltage V(dc) = 200 V and resistive load impedance of 10 ohm. The duty cycle is 0.4 the voltage drop across the switch may be taken as zero, Calculate : (a) Average and RMS value of output voltage. (b) Average and RMS value of output current.