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Question: A Dc machine is connected across a 240-volt line. It rotatesat 1200 rpm and is generating 230 volts. the armature current is40amps. A) Is the machine functioning as a generator or motor?B) Determine the resistance of teh armature circuit.C) Determine the power losss in the armature circuitresistance and the electromagnetic power.
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2. Determine the flux per pole of a six-pole generator required to generate 240V at 500 rpm. The armature has 120 slots, with eight conducted per slot, and is lap connected. 3. If the armature current in the generator of Problems 1 is 25A, what electro- magnetic torque is developed?
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1a) A 10 kW, 240 V dc shunt motor draws a line current of 6 A while running at a no-load speed of 1200 rpm from a 240 V dc supply. It has an armature resistance of 0.2 ohm and field resistance of 240 ohm. Estimate the efficiency of the motor when it delivers rated load. Also, calculate the speed of the motor at rated load condition.
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QUESTION 2 (10 marks) A dc machine is connected across a 240-volt line. It rotates at 1200 rpm and generates 230 volts. The armature current is 40 amps. Q2.1 is the machine functioning as a generator or a motor? Explain. (1 mark) Q2.2 Determine the armature resistance. (1 mark) Q2.3 Determine the power loss in the armature circuit.
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The maximum induced emf in a generator rotating at 240 {rm rpm} is 35 {rm V}. How fast must the rotor of the generator rotate if it is to generate a maximum induced emf of 58 {rm V}? Here's the best way to solve it.
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A 23kW, 230V, 900 rpm shunt generator has 240.5V induced in its armature winding when it delivers the rated load at the rated voltage. The field current is 5A. What is the armature resistance? What is the field circuit resistance? The no load voltage of the genrator is 245V. What is the voltage regulation?
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A 5 hp, 240 V, 1750 rpm, separately excited DC motor is controlled using a four-quadrant chopper circuit.The converter is fed by a DC source (V s = 240 V) and the motor's current is controlled using hysteresis current controller. The rated …
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