2. Nominal values of the shunt dynamo; 250 kW is given as 550 V. Nominal run ww For the condition, excitation current is 4.3 A, iron loss 4.85 kW and friction loss 3.45 kW. This by; Dynamo with armature winding resistance 0.05 0 at nominal voltage and nominal speed www What is the efficiency when working at 50% of the power? www

2. Nominal values of the shunt dynamo; 250 kW is given as 550 V. Nominal run ww For the condition, excitation current is 4.3 A, iron loss 4.85 kW and friction loss 3.45 kW. This by; Dynamo with armature winding resistance 0.05 0 at nominal voltage and nominal speed www What is the efficiency when working at 50% of the power? www

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 220 V dc machine has an armature resistance of 1ohm if the full load current is 20 A, the difference of induced voltage, when the machine is running as a motor and generator, is *
Dc generator
S. 13
A 240 V. D.C. A shunt generator supplies a full load current of 60 A. The armature and shunt field resistances are 0.1 ohm and 120 respectively. If the iron loss is 400 W and the mechanical loss is 500 W, find the full load efficiency.
Can you solve the question ?
Stray losses represent: O A. Resistive losses in the windings of the machine O B. Losses due to friction of the moving parts O C. Losses due to magnetization and demagnetization of the core O D. Windage losses O E. None of the other choices are correct
Q3. Write if the shown statements are TRUE or FALSE. 1- In DC machine the induced e.m.f is proportional with flux only. 2- The Ta/l a graph of a d.c. series motor is a straight line throughout. 3- In a DC motor the direction of the shaft rotation can be change by changing the polarity of the power supply. 4-The critical resistance is less than armature resistance in shunt generator. 5-As the load is increased, the speed of a d.c. shunt motor increases slightly.
This course EHide blom Clear my choice An eight-pole, 24 KW, 124 V, DC machine has a duplex LAP-wound armature which has 72 coils with 6 turns per coil. Its rated speed is 3000 RPM. Assume no dead zone Find the constant K and the flux per pole to produce 80 Volts at no-load conditions Select one: a. None Ob. K = 68.86 and flux = 3.33 mWb/pole Oc.K = 68.755 and flux = 3.7 mWb / pole O d. K = 95.5 and flux = 3.7 mWb / pole A peries DC motor has a series-field windino of 25 turns per pole. Its armature resistance in 0,1 2. and its
Show detailed solution with illustration.
A 220 V DC machine has an armature resistance of 1 Q. If the full load current is 20 A, what is the difference in induced voltage when the machine is running as generator and motor under full load condition
A 600 V series motor takes 120 A and operates at 900 rpm when the load is80 HP. If the effective circuit resistance is 0.20 ohm, calculate the HPoutput of the motor when the current drops to 90 A. assuming that the fluxis reduced by 20 %. [Ans. 49.86 HP]
a) A sinewave is having a frequency of 100 Hz and instantaneous value of 150 Volts at 1.5 milli seconds. Find i) The maximum value of sinusoidal voltage waveform and ii) The value of voltage at 1.8 milli seconds. b) Determine the instantaneous equation for the voltage waveform shown in figure, if Vp=100 Volts, Time period is 20 milli seconds and =40 degrees. Vp ì = 0