12. The regulation of a 250-volt shunt generator is 6 per cent. Calculate the no-load voltage.
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12. The regulation of a 250-volt shunt generator is 6 per cent. Calculate the no-load voltage.
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- The series winding resistance of the compound generator below is 2 Ohms and the shunt winding resistance is 88 Ohms. If the armature resistance = 0.4 Ohm, the generator voltage and load voltage are 225 Volts and 200 Volts respectively and the generator load is 2 kW, calculate the current flowing in the load.Calculate the per cent voltage regulation of a 4 KW, 229 -volt shunt generator which has a no-load voltage is 238.9 Volts.16. What is the procedure for shunting down a generator ? (DC GENERATOR QUESTION)
- If the armature resistance of a 3-phase, 318.75 kVA, 2300-V synchronous generator is 0.35 ohms per phase, the synchronous reactance is It is 1.2 ohms. Calculate the excitation voltage and voltage regulation for the following load cases: a) Full load, back power factor of 0.8 and rated voltage. b) Full load, forward power factor of 0.6 and rated voltage.What is the rated full-load current of a ¾-horsepower, 208-volt single-phase motorA short shunt compound generator delivers 150A at a terminal voltage is 230V. The shunt field current is 2.5A. The resistances of the armature, series field and diverter are 0.032-ohm, 0.015 ohm and 0.03 ohm, respectively. Calculate the electrical efficiency of the generator at this load.
- The voltage of a 100-KW, 250-volt shunt generator rises to 260 volts when the load is removed.What is the full-load current does the machine deliver,and what is its percent regulation?460VAC squirrel cage, 60 hp, 3 phase induction-type AC motor, is to be controlled with 220VAC rated magnetic contactor. Control circuit will be supplied with 110VAC. What is the full-load current and the conductor size.A 460VAC rated, 60 Hz, 125-Hp Three-phase Synchronous type motor is to be connected for across-the-line starting. Determine its conductor size if the ambient temp and ZW copper will be used.
- Q1 / Answer the following questions 1 - what are the basic essential parts of an electrical generator? 2- What is the function of armature core in generator? 3- What is the meaning of standing losses? 4- What are the reasons for using three phase system to generat and distribute electrical power.Question 1: Why is the voltage decresed at no-load operation? What is that voltage called? Question 2: Does the voltage increase with the increasing load? Why? Question 3: In which position the voltage decreased with the increasing load? Explain the reason. Question 4: Does the voltage change when a parallel rheostat is connected to the series excitation windings? Explain the reason. Question 5: Sketch the loading curve of the series generator depending on the values recorded.Why stationary armature type alternator is widely used ? Option 1: 2 slip rings used, more efficient cooling, less insulation Option 2: None of these. Option 3: 3 slip rings, insulation cost is high,no winding damages Option 4: 2 slip rings used, high insulation , no damages to windings.