3 4 5 Question 2 A 220V, 5.5 kW, DC shunt generator has an armature resistance of 0.2 0 and a total field-circuit resistance of 55 0. The generator is supplying rated current at rated terminal voltage. Answer the following questions relating to this generator: () What is the generator armature current? (a) 17 A (b) 21 A (c) 25 A (d) 29 A (e) 33 A (ii) What is the armature internal voltage Eo? (а) 214.2 V (b) 224.2 V (c) 220.0 V (d) 225.0 V (e) 225.8 V (ii) What is the efficiency of the generator if rotational losses are 300 W? (а) 73.9% (b) 78.2% (c) 80.3% (d) 86.2% (e) 96.8% (iv) What is the generator voltage regulation if the terminal voltage rises to 222.2 V when the load (only) is reduced by 50%? Assume a linear regulation characteristic for the shunt generator (a) 0.5% (b) 1% (c) 2% (d) 5% (e) 10%

3 4 5 Question 2 A 220V, 5.5 kW, DC shunt generator has an armature resistance of 0.2 0 and a total field-circuit resistance of 55 0. The generator is supplying rated current at rated terminal voltage. Answer the following questions relating to this generator: () What is the generator armature current? (a) 17 A (b) 21 A (c) 25 A (d) 29 A (e) 33 A (ii) What is the armature internal voltage Eo? (а) 214.2 V (b) 224.2 V (c) 220.0 V (d) 225.0 V (e) 225.8 V (ii) What is the efficiency of the generator if rotational losses are 300 W? (а) 73.9% (b) 78.2% (c) 80.3% (d) 86.2% (e) 96.8% (iv) What is the generator voltage regulation if the terminal voltage rises to 222.2 V when the load (only) is reduced by 50%? Assume a linear regulation characteristic for the shunt generator (a) 0.5% (b) 1% (c) 2% (d) 5% (e) 10%

Electric Motor Control

10th Edition

ISBN:9781133702818

Author:Herman

Publisher:Herman

Chapter57: Dc Variable-speed Control-motor Drives

Section: Chapter Questions

Problem 8SQ

See similar textbooks

Similar questions

An 8-Pole, simplex lap wound, shunt generator has 800conductors and a flux per pole of 0.025Wb and running at 1200rpm. The armature and shunt field resistances are 0.25Ω and 120Ω respectively. If the armature voltage drop is equal to 10V, what is the load current (in Amp)? use two decimal places if the answer is not exact and do not include the unit anymore.
Open circuit tests carried out on a 3.5 MVA, 4.16 kV, 60 Hz, three phase star connected synchronous generator gave the following results:If (A):1015202530EL (kV):3.54.165.76.257.95In the short circuit test a field current of 20A was needed to circulate full load current. The armature winding resistance is 1.2Ω /phase, the field winding resistance is 500 Ω and the rotational loss is 250kW. Determine the power angle, the voltage regulation and the efficiency when the generator delivers rated load at terminal voltage of 4.4 kV and at 0.8 power factor leading.Draw the power flow diagram for the generator and include all values of power flows.
An 8 pole DC shunt generator with wave winding has 4800 conductor with 20 turns and average per pole flux is 20 mwb and armature current and armature resistance is 20 A and 0.5 ohm respectively find? (i) Induced emf (ii) Terminal voltage
A short shunt compound DC generator supplies a load current of 10A at a voltage of 10 volts. If the resistance of armature, shunt field and series field windings are 0.001 ohm, 1 ohm 0.00 ohm respectively. c) write down the factors to improve the generated voltage.
A shunt generator has an output of 22 kW at a terminal voltage of 220 V. armature and shunt field resistances are 0.05 ohm and 44 ohms, respectively. If the copper loss is equal to the core, friction and windage losses at this load, the over-all efficiency of this generator is nearest to
The output of a shunt generator is 66 A at 100 volts. Armature and field resistances are, respectively, 0.04 ohm and 25 ohms. If the efficiency at this load is 88%, determine the core and friction losses
The following information is given for a Long Shunt connected Flat Compound Generator: Power rating = 100KW; Terminal voltage = 250 volts ; the shunt field winding resistance = 125 ohms; the armature winding resistance = 0.3 ohm; series field winding resistance = 0.13 ohm; the diverter resistance = 0.11 ohm. Calculate the power generated by the generator when it is, delivering power to the load at its rated or full-load value. delivering power to the load at half full-load or half rated value
A 220V, 5.5 kW, DC shunt generator has an armature resistance of 0.2 Ω and a total field-circuit resistance of 55 W. The generator is supplying rated current at rated terminal voltage. Answer the following questions relating to this generator and explain your choice of answer. (i) What is the generator armature current? 17 A 21 A 25 A 29 A 33 A (ii) What is the armature internal voltage E0? 2 V 2 V 0 V 0 V 8 V (iii) What is the efficiency of the generator if rotational losses are 300 W? 9% 2% 3% 2% 8% (iv) What is the generator voltage regulation if the terminal voltage rises to 222.2 V when the load (only) is reduced by 50%? Assume a linear regulation characteristic for the shunt generator. 5% 1% 2% 5% 10%
A 6-pole, lap-wound, DC generator has a useful flux per pole of 0.08 Wb. The armature winding consists of 200 turns and the resistance is 0.055 ohms. Calculate the terminal voltage if the resistance of shunt and series field are 100 ohms and 0.02 ohms respectively, when the generator is running at 1000 rpa. Assume generator connection as short-shuntb. Assume generator connection as long-shunt
The rated power of a Comp-connected DC generator operated at rated load is 13927 W and the rated voltage is 140 Volt, and its mechanical losses are measured as 616 W. The armature resistance of this generator is 0.134 ohm and the series field winding resistance is 0.098 ohm. The shunt field winding resistance is 65 ohms and is fed from an external source of 157 Volts. Calculate the generator efficiency of this compound generator. Please answer asap for like this please
A 20 kW, 440-V, short-shunt, compound d.c. generator has a full-loade fficiency of 87%. If the resistance of the armature and interpoles is 0.4Ω and that of the series and shunt fields 0.25 Ω and 240 Ω respectively, calculate the combined bearing friction, windage and core-loss of the machine. [Ans. 725 W]
A Short shunt compound generator delivers a load current of (16)A at 400V. Armature resistance 0.08 ohms, Series field resistance is 0.6ohms and the shunt field resistance is 200+ 16 ohms. Calculate the induced EMF and the armature current. Allow 1.5V per brush for contact drop Calculate the efficiency. Neglect the core and mechanical loss