A 220-V shunt generator has a full-load current of 100 A, shunt field resistance of 100 ohms and stray losses of 250 W. If full-load efficiency is 80%, find the armature resistance. Assuming voltage to be constant at 220 V, calculate the efficiency at half full-load and at 50% overload. Also, find the load current corresponding to maximum efficiency.

A 220-V shunt generator has a full-load current of 100 A, shunt field resistance of 100 ohms and stray losses of 250 W. If full-load efficiency is 80%, find the armature resistance. Assuming voltage to be constant at 220 V, calculate the efficiency at half full-load and at 50% overload. Also, find the load current corresponding to maximum efficiency.

Power System Analysis and Design (MindTap Course List)

6th Edition

ISBN:9781305632134

Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Chapter11: Transient Stability

Section: Chapter Questions

Problem 11.3P

See similar textbooks

Similar questions

A 110V shunt generator has a full load current of 100A, shunt field resistance of 55 ohms and constant losses of 500W. If full load efficiency is 88%, find the armature resistance. Assuming voltage to be constant at 110V, calculate the efficiency at half load. Find the load current.
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. Assuming voltage to be constant at 110 V, calculate the efficiency at half-F.L. and at 50% overload. Find the load current corresponding to maximum efficiency.
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. Assuming voltage to be constant at 110 V, calculate the efficiency at half F.L. And at 50% overload. Find the load current
A 110-V shunt generator has a full-load current of 100 A, shunt fieldresistance of 55 Ω and constant losses of 500 W. If F.L. efficiency is88%, find armature resistance. Assuming voltage to be constant at 110 V,calculate the efficiency at half F.L. And at 50% overload. Find the loadcurrent. Write the answer neatly.
9. A 110-V shunt generator has a full-load current of 100 A, shunt field resistance of 55 ohms and constant losses of 500 W. If F.L. efficiency is 88%, find armature resistance. Assuming voltage to be constant at 110 V, calculate the efficiency at half F.L. And at 50% overload. Find the load current.
Dc machines A separately excited D.C. generator has an armature circuit resistance of 0.1 ohms. And the total brush-drop is 2 V. When running at 1000 r.p.m., it delivers a current of 100 A at 250 V to a load of constant resistance. If the generator speed drop to 700 r.p.m., with field-current unaltered, find the current delivered to load.
- A separately excited 4 - pole, 900 rpm wave wound dc generator has an induced emf of 240V at rated speed and rated field current. When connected to a load, the terminal voltage is observed to be 200V. If the armature resistance is 0.2 Ω and the flux per pole is 10 m Wb, compute the armature current and the number of conductors
A separately excited generator,when running at 1000rpm supplied 200A at 125V. What will be the load current when the speed drops to 800rpm if current is unchanged? Given the armature resistance of 0.04 ohms and brush drop of 2V.
A 20KW, 440V, short shunt compound dc generator has full load efficiency of 87%. If the resistance of the armature and interpoles is 0.4ohm and that of the series and shunt fields 0.25ohm and 240ohms respectively, calculate the combined bearing friction, windage and core loss of the machine A 10 kW 250 volts self-excited generator, when delivering rated load, has an armature-circuit voltage drop of 5% of the terminal voltage and a shunt field current equal to 5% of the rated load current. The resistance of the armature is 0.02 ohm. Calculate the voltage generated and power output.
A 50 kW, 220 V, dc shunt generators has an armature resistance including brushes of 0.026 ohms. If the shunt field resistance is 52 Ω. Find the induced emf at rated load.
A separately excited D.C. generator has an armature circuit resistance of 0.1 ohms. And the total brush-drop is 2 V. When running at 1000 r.p.m., it delivers a current of 100 A at 250 V to a load of constant resistance. If the generator speed drop to 700 r.p.m., with field-current unaltered, find the current delivered to load.
A 220V short-shunt compound generator has armature resistance, series field resistance and shunt field resistances of 0.6, 0.44 and 300 - 16 respectively. If the generator supplies a 10+16 kW load at a rated voltage, find the induced voltage in the armature. Ignore armature reaction. Find the efficiency if the mech and core loss is 500W