A 250V, 150 kW, 850 rpm, DC shunt generator has an armature resistance of 15 m0 and a total field-circuit resistance of 25 2. The generator is driven at rated speed and supplying rated load at rated terminal voltage with 92.5% efficiency. Complete the power flow diagram below by entering the unknown values in the boxes provided. Express your answers in kW to three decimal places. Neatly show all work in the space below the diagram Pout Pin Po PE Pa Prot

A 250V, 150 kW, 850 rpm, DC shunt generator has an armature resistance of 15 m0 and a total field-circuit resistance of 25 2. The generator is driven at rated speed and supplying rated load at rated terminal voltage with 92.5% efficiency. Complete the power flow diagram below by entering the unknown values in the boxes provided. Express your answers in kW to three decimal places. Neatly show all work in the space below the diagram Pout Pin Po PE Pa Prot

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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SOLVE THE PROBLEM, SHOW YOUR COMPLETE SOLUTION AND MAKE SURE THAT THE FINALS ANSWERS ARE IN 4 DECIMAL PLACES. A 250V shunt generator runs at 1,000 rpm at no load and delivers 8 A. The total armature and shunt field resistance are 0.20 and 2500 respectively. When loaded, the generator delivers 50 A to the load. a. Calculate the speed when loaded and the flux per pole remains constant. b. Calculate the speed when loaded and the flux per pole drops to 90% of that of no-load.
Q3/ ( a) A d.c. series generator has armature resistance is 0.5 ohm and series field resistance is 0.03 ohm. It drives a load of 50 A. If it has 6 turns/coil and total 540 coils on the armature and is driven at 1500 r.p.m. Calculate the terminal voltage at the load. Assume 4 poles, lap type winding, flux per pole as 2 mWb and total brush drop as 2 V. (b)/Explain briefly construction of D.C. machine and What are the functions of a Yoke in DC machines? Explain.
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In a separately excited generator supplying rated load the armature reaction. is always present is always absent O none of these may be sometimes present
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A 4-pole, d.c. generator has a wave-wound armature with 792 conductors. The flux per pole is [751.3 r.p.m.] 1. 0.0121 Wb. Determine the speed at which it should be run to generate 240 V on no-load. 2. A 20 kW compound generator works on full-load with a terminal voltage of 230 V. The armature, series and shunt field resistances are 0.1, 0.05 and 115 Q2 respectively. Calculate the generated e.m.f. when the generator is connected short-shunt. [243.25 V] (Elect. Engg. Madras Univ. April, 1978) 3. A d.c. generator generates an e.m.f. of 520 V. It has 2,000 armature conductors, flux per pole of 0.013 Wb, speed of 1200 r.p.m. and the armature winding has four parallel paths. Find the number of poles. [4] (Elect. Technology, Aligarh Univ. 1978) When driven at 1000 r.p.m. with a flux per pole of 0.02 Wb, a d.c. generator has an e.m.f. of 200 V. If the speed is increased to 1100 r.p.m. and at the same time the flux per pole is reduced to 0.019 Wb per pole, [209 V] 4. what is then the induced…
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The armature reaction occurs when a separately excited generator supplies rated load: Is always present Is always absent May be sometimes present None of the above
Q2: Correct the wrong statement if any: 1-The series filed of a series de generator is excited by armature current. 2- The developed power in DC generator armature is function to load current. 3-The commercial efficiency of DC generators is relationship between output mechanical power and developed power in armature winding. 4- If the source frequency subjected to primary windings increased, the iron losses also decreased. 5-In transformers short circuit test primary voltage will be greater than secondary voltage.
Q2: Correct the wrong statement if any: 1-The series filed of a series de generator is excited by armature current. 2- The developed power in DC generator armature is function to load current. 3-The commercial efficiency of DC generators is relationship between output mechanical power and developed power in armature winding. 4- If the source frequeney subjected to primary windings increased, the iron losses also decreased. 5-In transformers short circuit test primary voltage will be greater than secondary voltage. GOOD LUCK
A 4 pole dc shunt generator with a shunt field resistance of 100 ohm and an armature resistance of 1 ohm has 378 wave connected conductor in its armature. the flux per pole is 0.02wb, if the load resistance of 10 ohm is connexted across the aemature terminal and the generator driven at 1000rpm, calculate the power obsorbed by load