A shunt generator has field resistance of 602 when the generator delivers 60 kw he terminal voltage is 120 V while the generated E.M.F is 135V. Determine: 1- The armature circuit resistance 1.A shunt generator has a field resistance 60 2 when generator delivers 20 kW the terminal voltage 135V while the armature circuit resistance is 0.28 2. Determine: 1- The generator E.M.F 2- Find efficiency of DC generator 2- Electrical efficiency

A shunt generator has field resistance of 602 when the generator delivers 60 kw he terminal voltage is 120 V while the generated E.M.F is 135V. Determine: 1- The armature circuit resistance 1.A shunt generator has a field resistance 60 2 when generator delivers 20 kW the terminal voltage 135V while the armature circuit resistance is 0.28 2. Determine: 1- The generator E.M.F 2- Find efficiency of DC generator 2- Electrical efficiency

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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Q1) A long shunt compound generator is supplying a load 100 A at a terminal voltage of 220 V. The armature, series and shunt field resistances are 0.2 2, 0.06 2 and 100 Q respectively. The iron loss is 400 W and the rotational loss is 500 W. a) Calculate the variable and constant losses. b) Find the power required at the input of the generator. c) Determine the efficiency of the generator. d) If the load current is reduced to 60%, determine the variable and constant losses for this condition. e) Determine the efficiency of the generator if the load current is reduced to 60% at a terminal voltage of 220 V.
A 250 V shunt generator has a full load armature current of 40 A. Under this condition the losses are friction and windage = 200 W, shunt field – 100 W, core loss – 260 W, brush contact = 120 W, armature cu. Loss = 400 W. For operation and max efficiency, calculate:a) The armature and line currentb) The load powerc) The max efficiency
Q23) A shunt generator supplies a 20KW load at 200V through cables of resistance, R = 100mΩ. If the field winding resistance ,Rf=50Ω and the armature resistance, Ra=40mΩ, i) Estimate terminal voltage across the load. ii) Calculate the emf generated in the armature.
Q/ A 110-V shunt generator has a full-load current of 100 A, shunt field resistance of 55 Ω and constant losses of 500 W. If F.L. efficiency is 88% Find : Armature resistance is .........Ω Assuming voltage to be constant at 110 V, the efficiency at half F.L ..........% *
DC GENERATOR. A 250 V shunt generator has a full load armature current of 40 A, under these conditions the losses are: FW = 200 watts, shunt field = 100 watts, core = 260 watts, brush contact = 120 watts, armature copper = 400 watts. For operation at maximum efficiency, when the constant losses are equal to those losses that vary as the square of the load, calculate the maximum efficiency.Include complete solution.
A 10KW DC generator having Armature resistance of 0.2 ohms, field resistance of 100 ohms supplies 50 A load current at full load. (a) What is the terminal voltage of the generator at full load? (b) What is the generated EMF of the Generator? (c) What is the efficiency of the generator at full load, assuming the Iron, Friction and Windage losses around 1.2 kW.
A 1500 kW, 550 V, 16 pole generator runs at 150 rev. per min. What must be the useful flux if there are 2500 conductors lap-connected and the full-load copper losses being 25 kW? Calculate the area of the pole shoe if the gap density has a uniform value of 0.9 wb/m2 and find the no-load terminal voltage, neglecting armature reaction and change in speed.
A short-shunt compound DC generator supplies a current of 100 A at 220 V. If the resistance of the shunt field is 50 ohms, of the series field 0.025 ohms, of the armature 0.05 ohm, the total brush drop is 2 V and the iron and friction losses amount to 1 kW, determine the following: The armature current, Amp The generated voltage, V The copper losses, W The output power of the prime mover, kW The generator efficiency, %
(Draw the Circuit Diagram) A self-excited shunt generator has a field resistance of 60 ohms. When the generator delivers 6 kW, the terminal voltage is 120 V, while the generated emf is 133 V. Determinethe armature resistance
A shunt generator has a field resistance of 120-16 π, When the generator delivers 8 kW, the terminal voltage is 110 V, while the generated EMF is 122 V, Determine: a) The armature resistance, and b) The generated EMF when the output is 3 kW at terminal voltage of 130 V.
A 120-V DC shunt generator has an armature resistance of 1-Ω and a shunt field resistance of 240-Ω. It delivers 9.5-A to a load. Determine the following: (a)What is the total emf generated? Neglect brush drop. (b) What is the total copper loss? (Copper loss in the armature and field) (c) Calculate the stray power losses (d) If the generator requires a mechanical input of 2-hp, what is the efficiency of the machine? (Use 1 hp = 746 W)
A 500 V, 250 kW, long shunt compound generator induces an e.m.f. of 480 V whenrunning at 1000 r.p.m. no load. On full load the spped of the machine drops to 975r.p.m. the flux increases by 15% and the terminal voltage rises to 500 V. If theseries and shunt field resistances are 0.02 ohm and 100 ohms respectively,calculate the armature resistance. Assume a voltage drop of 1V per brush.[Ans.