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1. Sketch neat graphs to show the internal or open-circuit characteristics of a separately-excited d.c. generator. Why is a field regulator necessary with such a machine? A four-pole d.c. generator gives 410 V on open circuit when driven at 900 rev/min. Calculate the flux per pole if the wave-connected armature winding has 39 slots with 16 conductors per slot. 010219 wb (U.E.I.)

1. Sketch neat graphs to show the internal or open-circuit characteristics of a separately-excited d.c. generator. Why is a field regulator necessary with such a machine? A four-pole d.c. generator gives 410 V on open circuit when driven at 900 rev/min. Calculate the flux per pole if the wave-connected armature winding has 39 slots with 16 conductors per slot. 010219 wb (U.E.I.)

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
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300 2. Also find the value of the critical resistance of the shunt circuit. EXAMPLES 7 1. Sketch neat graphs to show the internal or open-circuit characteristics of a separately-excited d.c. generator. Why is a field regulator necessary with such a machine? A four-pole d.c. generator gives 410 V on open circuit when driven at 900 rev/min. Calculate the flux per pole if the wave-connected armature winding has 39 slots with 16 conductors per slot. 10219 wb (U.E.I.) 2. A six-pole d.c. generator having a lap-connected armature winding is required to give a terminal voltage of 240 V when supplying an arma- ture current of 400 A. The armature has 84 slots and is driven at 700 rev/min. The resistance of the armature circuit is 0-03 2 and the useful flux per pole is about 0-03 Wb. Calculate the number of conductors per slot and the actual value of the useful flux per pole. 8 o:0321 wb 3. Explain why the terminal voltage of a d.c. shunt-excited generator falls as the current supplied by the machine is increased. The resistance of the field circuit of a shunt-excited d.c. generator is 200 2. When the output of the generator is 100 kW, the terminal voltage is 500 V and the generated e.m.f. 525 V. Calculate: (a) the armature resistance, and (b) the value of the generated e.m.f. when the output is 60 kW, if the terminal voltage is then 520 V. 23 534.5 (E.M.E.U.) 4. A short-shunt compound generator has armature, shunt-field and series-field resistances of 0-8 2, 45 and 0-6 2 respectively and sup- plies a load of 5 kW at 250 V. Calculate the e.m.f. generated in the armature. 282-66V 5. The following table gives the open-circuit voltages for different field currents of a shunt generator driven at a constant speed: Terminal voltage (V) Field current (A) 120 240 334 400 444 470 0-5 1-0 1-5 2:0 2:5 3-0 Plot a graph showing the variation of generated e.m.f. with exciting current and from this graph deriye the value of the generated e.m.f. when the shunt circuit has a resistance of (a) 160 2, (b) 210 2 and (c)
Transcribed Image Text:300 2. Also find the value of the critical resistance of the shunt circuit. EXAMPLES 7 1. Sketch neat graphs to show the internal or open-circuit characteristics of a separately-excited d.c. generator. Why is a field regulator necessary with such a machine? A four-pole d.c. generator gives 410 V on open circuit when driven at 900 rev/min. Calculate the flux per pole if the wave-connected armature winding has 39 slots with 16 conductors per slot. 10219 wb (U.E.I.) 2. A six-pole d.c. generator having a lap-connected armature winding is required to give a terminal voltage of 240 V when supplying an arma- ture current of 400 A. The armature has 84 slots and is driven at 700 rev/min. The resistance of the armature circuit is 0-03 2 and the useful flux per pole is about 0-03 Wb. Calculate the number of conductors per slot and the actual value of the useful flux per pole. 8 o:0321 wb 3. Explain why the terminal voltage of a d.c. shunt-excited generator falls as the current supplied by the machine is increased. The resistance of the field circuit of a shunt-excited d.c. generator is 200 2. When the output of the generator is 100 kW, the terminal voltage is 500 V and the generated e.m.f. 525 V. Calculate: (a) the armature resistance, and (b) the value of the generated e.m.f. when the output is 60 kW, if the terminal voltage is then 520 V. 23 534.5 (E.M.E.U.) 4. A short-shunt compound generator has armature, shunt-field and series-field resistances of 0-8 2, 45 and 0-6 2 respectively and sup- plies a load of 5 kW at 250 V. Calculate the e.m.f. generated in the armature. 282-66V 5. The following table gives the open-circuit voltages for different field currents of a shunt generator driven at a constant speed: Terminal voltage (V) Field current (A) 120 240 334 400 444 470 0-5 1-0 1-5 2:0 2:5 3-0 Plot a graph showing the variation of generated e.m.f. with exciting current and from this graph deriye the value of the generated e.m.f. when the shunt circuit has a resistance of (a) 160 2, (b) 210 2 and (c)
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