A shunt machine has armature and field resistances of 0.04 2 and 100 2 respectively.When connected to a 460 V d.c. supply and driven as a generator at 600 r/min, it delivers50 kW. Calculate:i.The generated e.m.f.ii.The speed of the machine in r.p.m., when running as a motor and taking50 kW from the same supply.CS Scanned with CamScanner

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Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

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• A DC shunt machine while running as generator develops a voltage of 250 V at 1000 r.p.m. on no-load. It has armature resistance of 0.5 ohm and field resistance of 250 ohm. When the machine runs as motor, input to it at no-load is 4 A at 250 V. Calculate the speed and efficiency of the machine when it runs as a motor taking 40 A at 250 V. Armature reaction weakens the field by 4 %
The resistance of the field winding(copper wire) of a DC machine is 0.25 ohm at 25°C. When operating at full-load, the temperature of the winding is 75 °C. The temperature coefficient of resistance of copper is 0.00427 per °C at 0°C. Find the resistance of the field winding at full-load.
A shunt generator supply 100A at 200 V. The armature and shunt resistance are 0.025 and 100 ohms respectively. If the copper losses are equal to the iron losses at this load. Find the HP of engine driving the generator. (Our subject is ELECTRICAL MACHINE 1, and our lesson is Losses and Efficiency on the DC MACHINE)
Problem # 1: A four-pole DC machine has a wave winding of 300 turns. The flux per pole is 0.025 Wb. The DC machine rotates at 1000 rpm. a) Determine the machine constant, b) Determine the generated voltage, c) Determine the kW rating if the rated current through the turn is 25 A. Problem # 2: The following information is taken from the nameplate of a separately-excited dc generator. Armature: 120 kW, 600 V, 0.15 Q. Field: 100 V, 6.0 A At its rated speed of 3600 rpm the no-load torque is measured at 16 Nm. Ignore armature reaction and magnetic saturation. a) For rated load conditions determine: i) Rated Shaft Horsepower ii) Rated Efficiency iii) Load Impedance b) Determine the terminal voltage, kW output and the efficiency if the field current is reduced to 4.5 A, and the speed is reduced to 3000 rpm, causing the rotational losses to become 4 kW. The load impedance is unchanged.
A DC series motor operates at 800rpm with a line current of 100A from 230V mains supply. Its armature and field resistances are 0.15 ohms and 0.1 ohms respectively. Find the speed at which motor runs at a line current of 25A, assuming the flux at this current is 45% of the flux at 100A.
Two generators operating in parallel supply a total load current of 150 A.The terminal potential difference of one machine falls from 250 V on no-load to 234 V when its current output is 100 A. The terminal potentialdifference of the other machine falls from 250 V on no-load to 230 V when its armature current is 80 A. The external characteristics are rectilinear. Determine :(i) The current supplied by each machine; and (ii) Terminal voltage. A: 91.46 A, 58.54 A, 235.37 V
Q6 a d.c. shunt machine while running as generator develops a voltage 250 V at 100 r.p.m. at no-load. It has armature resistance of 0.5 2 and field resistance of 250 2. When the machine runs as a motor, input to it at no-load is 4 A, 250 V. calculate the speed and efficiency of the machine when it runs as a motor taking 40 A at 250 V. Armature reaction weakens the field by 4 %.
A dc shunt generator delivers 50 kw at 250 v, its armature has a 4-pole wave winding with a resistance of 0.01 ohm and its field resistance is 125 ohm. if the number of turns in the armature is 201 and the flux per pole is 0.02 wb, find the voltage generated and the speed of operation. *
16. At what speed, in rpm, must the armature of a dc machine run to develop 5,720-W at a torque of 46.05-Nm? A, 1087 C. 1287 D. none of these B. 1187
38. Calculate the voltage induced in the armature winding of a 4-pole, wave wound, dc machine having 728 active conductors and running at 1800 rpm. The flux per pole is 30 mWb.a. 1310 Vb. 1512 Vc. 1210 Vd. 1620 V

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