Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN: 9780133923605
Author: Robert L. Boylestad
Publisher: PEARSON
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A 2-pole, single-phase alternator driven at 3000rpm require a
- the frequency generated,
- the input driving torque on full-load and
- the rotor field current
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- A 4-pole, 3-phase alternator drives at 1500 r.p.m. is supplying to an induction motor which has full load speed of 4320 r.p.m. Find the percentage slip and number of poles.arrow_forward5. A 25 MVA turbo-alternator is working on full load at a power factor of 0-8 and efficiency of 97%. Find the quantity of cooling air required per minute at full load, assuming that 90% of the total losses are dissipated by the internally circulating air. The inlet air temperature is 20° C and the temperature rise is 30° C. Given that specific heat of air is 0-24 and that 1 kg of air occupies 0-8 m3. [890 m3/minute|arrow_forwardSee attached.arrow_forward
- 32. An alternator requires an alternating current of 2.1 A to produce on short circuit its full-load current of 50 A. The same on open-circuit an emf of 320 V. The armature resistance is 1Ohms . Find the full-load percentage regulation with a lagging p.f. of 0.6 when terminal p.d. on load is 2000 V. A. 7.2% B. 28.8% C. 3.6% D. 14.4%arrow_forwardRather than use transistors your friend W. Too wants to use diodes to implement logic gates. He shows you the circuit he designed shown in figure 5. If A and B can swing all the way from 0 V to VDD, does the circuit implement a logic gate? If so what gate is it and what is its static discipline? Assume the diode is modeled by an ideal diode with a series resistance RD V. DD R₁ L ΟΥ AO Bo Figure 5: Diode Based Logic Gatearrow_forwardExercise 2 A shunt generator delivers 14A at 270V and the resistance of the shunt field and armature are 100 Q and 0.75 Q2, respectively. Calculate: i. The generated emf and the efficiency of this operating condition. ii. The generated emf if the shunt field impedance was triple and if it was double and the efficiency of these cases. iii. What emf could serve tha same active power of load but at load voltage of 240V and the efficiency in this case.arrow_forward
- DC motrarrow_forwardShow that an alternator running in parallel on constant-voltage and frequency bus-bars has a natural time period of oscillation. Deduce a formula for the time of one complete oscillation and calculate its value for a 5000-kVA, 3-phase, 10,000-V machine running at 1500 r.p.m. on constant 50-Hz bus-bars. The moment of inertia of the whole moving system is 14,112 kg-m2 and the steady short-circuit is five times the normal full-load value. ANSWER IS [1.33 second]arrow_forwardA 2 MVA, 2.3 kV, 3 phase Y connected alternator operates at rated kVA at a PF of 80%. The DC armature winding resistance between terminals is 0.08 ohms. The field takes 70 A at 125 V from an exciter equipment. Friction and windage loss is 20 kW, iron losses 36 kW and stray load losses are 2 kW. Calculate the efficiency of the alternator. Assume the effective armature winding resistance 12% of the DC resistance.arrow_forward
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