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Q1. Calculate the voltage induced in the armature winding of a 4-pole, lap-wound DC machine having 500 conductors and running at 1,000 rpm. The flux per pole is 30 mWb.? What will be induced emf if the armature is rewound for wave winding? (Ans. 250 V; 500 V)

Q1. Calculate the voltage induced in the armature winding of a 4-pole, lap-wound DC machine having 500 conductors and running at 1,000 rpm. The flux per pole is 30 mWb.? What will be induced emf if the armature is rewound for wave winding? (Ans. 250 V; 500 V)

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
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NUMERICAL QUESTION Q1. Calculate the voltage induced in the armature winding of a 4-pole, lap-wound DC machine having 500 conductors and running at 1,000 rpm. The flux per pole is 30 mWb.? What will be induced emf if the armature is rewound for wave winding? (Ans. 250 V; 500 V) Q2. A 4-pole, wave-wound armature has 72 slots with two coil-sides per slot, each coil has four turns. If the flux per pole is 20 mWb and the armature rotates at 720 rpm, what is the induced emf across the armature? (Ans. 276.48 V) Q3. A 4-pole machine has an armature with 90 slots and 8 conductors per slot, the flux per pole is 0.05 Wb and runs at 1,200 rpm. Determine induced emf if winding is (i) lap connected and (ii) wave connected. (Ans. 720 V, 1440 V) Q 4. An 8-pole DC generator has 400 armature conductors and a useful flux of 0.05 Wb. What will be the emf generated if it is lap wound and runs at 1,500 rpm? What must be the speed at which it is to be driven to induce the same voltage if it is wave wound? (Ans. 500 V; 375 rpm) Q 5. A wave-wound armature of a 6-pole generator has 51 slots. Each slot contains 20 conductors. The voltage required to be generated is 250 V. What would be the speed of coupled prime mover if flux per pole is 0.07 Wb. If the armature is rewound as lap-wound machine and run by same prime mover, what will be the generated voltage? (Ans. 70 rpm; 83.3 V) Q6. A 4-pole wave-wound armature rotating at 400 rpm is required to generate 300 V. The effective flux per pole is about 0.05 Wb. If the armature has 120 slots, determine the suitable number of conductors per slot and hence determine the actual value of flux required to generate the same voltage. (Ans. 4; 46.875 mWb)
Transcribed Image Text:NUMERICAL QUESTION Q1. Calculate the voltage induced in the armature winding of a 4-pole, lap-wound DC machine having 500 conductors and running at 1,000 rpm. The flux per pole is 30 mWb.? What will be induced emf if the armature is rewound for wave winding? (Ans. 250 V; 500 V) Q2. A 4-pole, wave-wound armature has 72 slots with two coil-sides per slot, each coil has four turns. If the flux per pole is 20 mWb and the armature rotates at 720 rpm, what is the induced emf across the armature? (Ans. 276.48 V) Q3. A 4-pole machine has an armature with 90 slots and 8 conductors per slot, the flux per pole is 0.05 Wb and runs at 1,200 rpm. Determine induced emf if winding is (i) lap connected and (ii) wave connected. (Ans. 720 V, 1440 V) Q 4. An 8-pole DC generator has 400 armature conductors and a useful flux of 0.05 Wb. What will be the emf generated if it is lap wound and runs at 1,500 rpm? What must be the speed at which it is to be driven to induce the same voltage if it is wave wound? (Ans. 500 V; 375 rpm) Q 5. A wave-wound armature of a 6-pole generator has 51 slots. Each slot contains 20 conductors. The voltage required to be generated is 250 V. What would be the speed of coupled prime mover if flux per pole is 0.07 Wb. If the armature is rewound as lap-wound machine and run by same prime mover, what will be the generated voltage? (Ans. 70 rpm; 83.3 V) Q6. A 4-pole wave-wound armature rotating at 400 rpm is required to generate 300 V. The effective flux per pole is about 0.05 Wb. If the armature has 120 slots, determine the suitable number of conductors per slot and hence determine the actual value of flux required to generate the same voltage. (Ans. 4; 46.875 mWb)
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