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A 250V, 4 pole, wave wound DC series motor has armature and series field resistance of 0.75 ohm and a total brush drop of 2V. The motor takes a current of 40 A. The armature conductors are 782 on its armature. It Determine the flux per pole if the motor is running at 338 RPM. 2. A 220V shunt motor runs at 1000 rpm at a lead 1.

A 250V, 4 pole, wave wound DC series motor has armature and series field resistance of 0.75 ohm and a total brush drop of 2V. The motor takes a current of 40 A. The armature conductors are 782 on its armature. It Determine the flux per pole if the motor is running at 338 RPM. 2. A 220V shunt motor runs at 1000 rpm at a lead 1.

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
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6. A 250V, 4 pole, wave wound DC series motor has armature and series field resistance of 0.75 ohm and a total brush drop of 2V. The motor takes a current of 40 A. The armature conductors are 782 on its armature. It Determine the flux per pole if the motor is running at 338 RPM. 2. A 220V shunt motor runs at 1,000 rpm at no load and takes 8 A with 2 mWb flux per pole. The total armature and shunt filed resistance are 0.22 and 250 respectively. Calculate the speed when loaded a taking 52 A. Assume the flux per pole has increased to 5 mWb. 3. A 100-V series motor is used to drive a load through a pulley. This machine has an armature resistance of 0.2 ohm, series field resistance of 0.25 ohm and a diverter resistance of 0.15 ohm. When a torque of 25 N-m is applied to the pulley, the speed is 600 RPM. If the stray power loss at this load is 300 W, calculate the efficiency of the machine. 1. 4. A shunt compound would DC belt-driven generator is rated 100-KW and running at 500 RPM. The generator supplies full-load to a bus bar at 230 V. At what speed will it run if the belt breaks and the machine continue to run taking 8.5 KW from the bus bar? The armature and shunt are 0.05 ohm and 85 ohms respectively. Allow a constant 1 V per brush of drop in both cases while the armature reaction drops to 95% when running as motor. 5. A 10-HP, 230-V, 4-pole, long-shunt compound motor runs at 1000 RPM when delivering full-load. The armature has 500 wave connected conductors and the full- load total copper losses are 1,100 W. the shunt, diverter, armature and series field resistances are 100 ohms, 0.05 ohm, 0.3 and 0.1 ohm respectively. Calculate the: The additional resistance needed to compensate current in the armature during starting when line current shoots up to 200 % the normal line current. Flux per pole Gross Torque exerted Over-all Efficiency A. B. C. D. A 20 HP, short-shunt compound motor running at 1200 RPM operates at a terminal voltage of 240 V. The resistances of the armature, shunt, diverter and series field are 0.4, 200, 0.3 and 0.2 ohms respectively. The full-load over-all efficiency is 75 %. Find the total copper losses, SPL and the maximum efficiency.
Transcribed Image Text:6. A 250V, 4 pole, wave wound DC series motor has armature and series field resistance of 0.75 ohm and a total brush drop of 2V. The motor takes a current of 40 A. The armature conductors are 782 on its armature. It Determine the flux per pole if the motor is running at 338 RPM. 2. A 220V shunt motor runs at 1,000 rpm at no load and takes 8 A with 2 mWb flux per pole. The total armature and shunt filed resistance are 0.22 and 250 respectively. Calculate the speed when loaded a taking 52 A. Assume the flux per pole has increased to 5 mWb. 3. A 100-V series motor is used to drive a load through a pulley. This machine has an armature resistance of 0.2 ohm, series field resistance of 0.25 ohm and a diverter resistance of 0.15 ohm. When a torque of 25 N-m is applied to the pulley, the speed is 600 RPM. If the stray power loss at this load is 300 W, calculate the efficiency of the machine. 1. 4. A shunt compound would DC belt-driven generator is rated 100-KW and running at 500 RPM. The generator supplies full-load to a bus bar at 230 V. At what speed will it run if the belt breaks and the machine continue to run taking 8.5 KW from the bus bar? The armature and shunt are 0.05 ohm and 85 ohms respectively. Allow a constant 1 V per brush of drop in both cases while the armature reaction drops to 95% when running as motor. 5. A 10-HP, 230-V, 4-pole, long-shunt compound motor runs at 1000 RPM when delivering full-load. The armature has 500 wave connected conductors and the full- load total copper losses are 1,100 W. the shunt, diverter, armature and series field resistances are 100 ohms, 0.05 ohm, 0.3 and 0.1 ohm respectively. Calculate the: The additional resistance needed to compensate current in the armature during starting when line current shoots up to 200 % the normal line current. Flux per pole Gross Torque exerted Over-all Efficiency A. B. C. D. A 20 HP, short-shunt compound motor running at 1200 RPM operates at a terminal voltage of 240 V. The resistances of the armature, shunt, diverter and series field are 0.4, 200, 0.3 and 0.2 ohms respectively. The full-load over-all efficiency is 75 %. Find the total copper losses, SPL and the maximum efficiency.
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