A 250-kW, 230 V long shunt compound generator is delivering 800 A at 230 V. The shunt field current is 12 A. The armature resistance is 0.007 Ω and series field resistance is 0.002 Ω. The stray power at this load is 5.5 kW. The generator is connected long shunt. Determine the efficiency of this
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32.) A 250-kW, 230 V long shunt compound generator is delivering 800 A at 230 V. The shunt field current is 12 A. The armature resistance is 0.007 Ω and series field resistance is 0.002 Ω. The stray power at this load is 5.5 kW. The generator is connected long shunt. Determine the efficiency of this load.
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- A 10-kW, 120-V DC series generator has anarmature resistance of 0.1Ω and a series fieldresistance of 0.05Ω . Assuming that it is deliveringrated current at rated speed, find (a) the armaturecurrent and (b) the generated voltage.A 150-kW 250-volt compound generator is connected long shunt. If the shunt field resistance is 20 ohms, what is the series field-current at full load? (Ans.: 612.5 A) write diagram, given, etcProblem 1: A short shunt compound DC generator delivers 25kW to a load at a terminal voltage of 250 V. The machine is running at 1200 rpm. The resistance of the armature winding, shunt filed winding, and series field winding are 0.12 N, 125 N, and 0.05 N, respectively. The machine's efficiency at the given load is 82%. (a) Draw the equivalent circuit of the DC generator. (b) Compute the input power and the corresponding applied input torque. (c) Compute the developed power and the corresponding developed torque.
- A 125-kW, 250-V, long-shunt compound dc generator has the following winding resistances: armature = 0.025 Ω; series field = 0.01 Ω; shunt field = 50 Ω. It stray power loss at rated voltage and speed is 5 kW. Find the efficiency under this condition.The output of a shunt generator is 66A at 100V. Armature resistance is 0.04Ω and the field resistance is 25Ω. if the total efficiency at this load is 88%, determine the core and friction losses14. A shunt generator has a no-load terminal voltage of 270 and a voltage of 245 when it delivers 180 amp. Assume a straight-line characteristic and determine the voltage when the current is 120 amp. What is the equivalent load resistance under this condition?
- The terminal voltage of a 75-kW shunt generator is 600 V at rated load. The resistance of the shunt-field circuit is 150 Q, and the armature-circuit resistance is 0.1 Ω. Find the generated emf. a) 612.9 V b) 621.9 V c) 692.1 V d) none of the above In a 50-kW 245-V shunt generator, 258 V are generated in the armature when the generator delivers rated load at rated voltage. The shunt-field current is 4 A. Find the resistance of the armature. a) 0.03 Ω b) 0.062 Ω c) 0.106 Ω d) none of the above A load that has a resistance of 8 Ω is connected to a separately excited generator that has an armature-circuit resistance of 0.5 Ω. A) What is the armature current when the generated emf is 130 V? a) 1.53 A b) 15.3 A c) 153 A d) none of the aboveA 15-kV 35-KVA 0.76-PF-lagging 50-Hz four-pole Y-connected steam-turbine generator has a synchronous reactance of 3.50 Ω per phase and an armature resistance of 0.75 Ω per phase. This generator is operating in parallel with a large power system (infinite bus).a) What is the magnitude of EA at rated conditions?b) What is the generator’s torque angle at rated conditions?c) If the field current is constant, what is the maximum power possible out of this generator? How much reserve power or torque does this generator have at full load? d) Sketch the corresponding phasor diagram and calculate for the armature current (assume the field current is still unchanged) e) At the absolute power possible, how much reactive power will this generator be supplying or consuming?A 15-kV 35-KVA 0.76-PF-lagging 50-Hz four-pole Y-connected steam-turbine generator has a synchronous reactance of 3.50 Ω per phase and an armature resistance of 0.75 Ω per phase. This generator is operating in parallel with a large power system (infinite bus). a) What is the magnitude of EA at rated conditions? b) What is the generator’s torque angle at rated conditions? c) If the field current is constant, what is the maximum power possible out of this generator? How much reserve power or torque does this generator have at full load? d) Sketch the corresponding phasor diagram and calculate for the armature current (assume the field current IF is still unchanged) e) At the absolute power possible, how much reactive power will this generator be supplying or consuming?
- A short-shunt generator supplies 220A at 260V. The armature resistance is 0.15Ω, shunt field resistance is 50Ω, and the series field resistance is 0.2Ω. If the SPL amounts to 4% of the total power output, determine the efficiency (in %).SOLVE THE PROBLEM, SHOW YOUR COMPLETE SOLUTION AND MAKE SURE THAT THE FINALS ANSWERS ARE IN 4 DECIMAL PLACES. 1. A 20-KW long compound DC generator is rated 240 V. It has a full load efficiency of 78% and stray power loss of 1600 watts. The shunt field and series field resistances are 110 ohms and 0.08 ohm respectively. Find the armature resistance, efficiency at maximum and the load current corresponding to maximum efficiency.6) A 15kW shunt generator having an Armature circuit Resistance of 0.2Ω and a field resistance of 200Ω, generates a terminal voltage of 220 V at full load. Find the Efficiency of the Generator at full load. Assume the Iron, Friction, and Windage losses are 0.5 kW.