5.23. A 50-kW, 250-V, 600-rpm, separately excited generator has an armatureresistance of 0.05 . The generator supplies the rated load at its rated volt-age. The field-winding circuit has a resistance of 100 and is connectedacross a 200-V source. The rotation loss is 5 kW. Determine the efficiency,the applied torque, and the voltage regulation when the armature reactionis zero.

Answered: Image /qna-images/answer/8d3cefda-228b-48ce-8fd3-cca13aae16f1.jpg

Answered: 5.23. A 50-kW, 250-V, 600-rpm,…

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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A thicker wire is used in the DC series field winding than DC shunt field winding in DC machines. * O because it carries the load current. O to prevent mechanical vibrations. O to provide strength. O to produce large flux. The speed of a DC motor can be changed by varying - armature resistance circuit O flux per pole O voltage source O all of above
Q5. A wave-wound armature of a 6-pole generator has 51 slots. Each slot contains 20 conductors. The voltage required to he 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)
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)
1.Two identical shunt generators running in parallel, each with armature resistance of 0.02 ohms and field resistance of 50 ohms. The combined load current is 5000A. The field are so excited that the generated voltages of one machine is 610V and the other is 600V. The terminal voltage of this parallel combination will be. www Ish1 Rh1 a.350-360 V b.450-460 V c. 550-560V Rat www az G₂ Raz 5000 A Ish2
• Q5/ in a DC motor. List and describe the types of losses that occur
Under load in DC machines, the armature current will cause: a. Compensating Windings O b. Increase in the main flux Oc Armature Reaction O d. Interpoles
al Power Technology A short-shunt d.c. compound generator supplies 250A at 50V. The resistance of armature, series field and shunt field windings are 0.02, 0.08 and 50 ohms respectively. Find the emf generated. The armature current la The generated voltage Eg An 8-pole d.c. generator has 455 armature conductors, and a useful flux of 44 mWb per pole. What will be the e.m.f. generated if it is lap-connected and runs at 1060 rpm? What must be the speed at which it is to driven produce the same e.m.f. if it is wave-wound?
Q2) In DC machine, the speed is 800 RPM, the flux per pole is 2 m wb, and it has a Lap winding armature with 6 coils (4 turns conductor per coil) . The DC machine has 2 poles and armature draws lc= 5.5 A. If the winding redesigned as wave winding, find the EA , Tem and Pem and explain what will happen when we change the design from lap to wave winding connection.
The winding of a 4-pole alternator having 36 slots and a coil span of 1 to 8 is short-pitched by ........... degrees. 150 40. 90 20 Brushless excitation system consisting of: Stator field winding and power diodes stator and rotor field winding and capacitor stator and rotor field winding and power diodes Everything mentioned in the options Full Name : *
The terminal voltage of a 150 kW series generator is 600 V at rated load. The armature resistance is 0.06 ohms and the series field resistance is 0.04 ohms. Find generated emf.
A DC shunt generator delivers 45 A at a terminal voltage of 220 V. The armature and the shunt field resistances are 0.01 2 and 44N respectively. The stray losses are 375 W. What is percentage efficiency of the DC generator
Fill in the following blanks:1. Lap winding is suitable for ……. Voltage, …… current d.c. generators.2. The critical resistance of the d.c. generator is the resistance of ……. .

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