A separately excited generator has a no-load voltage of 130V at a field current of 2.1 A when driven at a speed of 1200 rpm. Assuming it is operating on the linear portion of its saturation curve, calculate to one decimal point. b. Generated voltage when the speed is reduced to 1050 rpm and the field current is increased to 2.8A from initial conditions. No Units!

A separately excited generator has a no-load voltage of 130V at a field current of 2.1 A when driven at a speed of 1200 rpm. Assuming it is operating on the linear portion of its saturation curve, calculate to one decimal point. b. Generated voltage when the speed is reduced to 1050 rpm and the field current is increased to 2.8A from initial conditions. No Units!

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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Q5) A 300 KW and 600 V Long shunt compound DC generator has shunt field resistance = 100 2, armature resistance = 0.05 Q, series field resistance 0.02 Q commutating field winding resistance = 0.015 2 connected in series with armature winding and diverter resistance = 0.03 Q connected in parallel with commutating field. When the generator is delivering half full load, calculate power generated by the armature.
Q) A separately excited de generator is rated for a load voltage of 150 V for a full load current of 20 A at 1500 rpm. With the load disconnected, the output voltage is 160 V. 1. Determine the voltage regulation, the load resistance, the armature resistance, and the developed torque at full load. 2. The speed of the generator is decreased to 1200 rpm, and the load resistance is unchanged. Determine the load current, the load voltage, and the developed power. Solution:
A six-pole, 30-slot dc commutator generator has a lap wound Armature winding. The armature constant, Ka is 9.55.The generator is operated with a separately excited field such that the field flux per pole is 0.04 weber/pole. The generator is driven at a speed of 3000 rpm. The no load armature voltage is 418.9 V. The above generator is now operated as a motor. The flux is 0.04 weber/pole. It is desired to supply a load requiring a Torque of 50 n–m at 4000 rpm. Armature circuit resistance is 0.075 ohm. Calculate (a) the back emf, (b) the required armature current and voltage to supply this load.
short shunt compound generator delivers a load current of 10A at 200V and has a shunt field resistance 200 ohms. The shunt field current of 2A. Then armature delivers a current of a.10A b.8A c.11A d.12A
An 8-Pole, simplex lap wound, shunt generator has 800conductors and a flux per pole of 0.025Wb. The armature and shunt field resistances are 1ohms and 45ohms respectively. If a resistance of 11.25ohms is connected as load and the machine is running at 800rpm. Calculate the terminal voltage (in Watts)
A 15-kV 35-KVA 0.76-PF-lagging 50-Hz four-pole Y-connected steam-turbine generator has a synchronous reactance of 3.50 0 per phase and an armature resistance of 0.75 0 per phase. This generator is operating in parallel with a large power system (infinite bus). a) What is the magnitude of E, at rated conditions? b) What is the generator's torque angle at rated conditions? c) If the field current is constant, what is the maximum power possible out of this generator? How much reserve power or torque does this generator have at full load? d) Sketch the corresponding phasor diagram and calculate for the armature current (assume the field current is still unchanged) e) At the absolute power possible, how much reactive power will this generator be supplying or consuming?
7) The flux per pole of a four-pole generator is 0.05 wb. It driven at a speed of 1500 rpm. In order to have an induced emf of 20 v per conductor, , if the winding is lap-connected, find (a) the number of conductors in series in each parallel path, (b) the number of conductors between brushes to generate 240 v, and (c) the total number of conductors in the armature.
SOLVE THE PROBLEM, SHOW YOUR COMPLETE SOLUTION AND MAKE SURE THAT THE FINALS ANSWERS ARE IN 4 DECIMAL PLACES. 1. A 20-KW long compound DC generator is rated 240 V. It has a full load efficiency of 78% and stray power loss of 1600 watts. The shunt field and series field resistances are 110 ohms and 0.08 ohm respectively. Find the armature resistance, efficiency at maximum and the load current corresponding to maximum efficiency.
A 25 kW, 240 V self excited dc shunt generator has a field circuit resistance of 62.5 02, and an armature resistance of 0.05 Q. When delivering rated current at rated speed and voltage, calculate % Efficiency when rotational losses are 1200W, and iron losses are 600W. Note that Copper losses must be calculated too. No Units!
A 480 V, 50 Hz, Y-connected, six-pole synchronous generator has the OCC shown in Figure below. This generator has a synchronous reactance of 0.1 02 and an armature resistance of 0.012 02. At full load, the machine supplies 700 A at 0.8 PF lagging. Under full-load conditions, the friction and windage losses are 40 kW, and the core losses are 30 kW. Ignore any field circuit losses. i. ii. iii. iv. V. vi. What is the speed of rotation of this generator? How much field current must be supplied to the generator to make the terminal voltage 480 V at no load? If the generator is now connected to a load and the load draws 700 A at 0.8 PF lagging, how much field current will be required to keep the terminal voltage equal to 480 V? How much power is the generator now supplying? How much power is supplied to the generator by the prime mover? What is this machine's overall efficiency? If the generator's load were suddenly disconnected from the line, what would happen to its terminal voltage?…
4. A 10kW, 250V compound generator has an armature, series field, compensating and shunt field resistances of 0.012, 0.022, 0.032 and 502 respectively. If the friction and windage losses is 1000 W. Assume 3V brush contact drop. Find a. Generated power by the armature b. electrical efficiency c. mechanical efficiency d. Over all efficiency