Activity no. 13. DC Generator Efficiency1. A 50kw generator has a full-load efficiency of 90.5%. Determine the total losses2. The field current of a 180 kw, 250 V DC shunt generator is 6 A. when running at full-load at rated terminalvoltage. If the combined armature and brush resistance is 0.02 ohm, solve for the electrical efficiency of thegenerator.

Electrical machines can be either generator or motors. They can be either Ac machines or DC…

Answered: 1. A 50kw generator has a full-load…

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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A 50-kVA, 550-volt single phase alternator draws a field current 10 A at rated load. With the same field current, the open circuit emf and short-circuit currents are 300V and 150A. The ohmic resistance of the armature between terminals is 0.18ohm. The ratio of effective to ohmic resistance maybe taken as 1.5. Determine the regulation at 0.8 power factor lagging. *Well Explained
the armature series field and shunt field resistance of a 125 kw, 250V long shunt cumulative compound DC generator are 0.025ohms, 0.01ohms and 30 ohms, respectively. If the stray power stray loss at rated load is 25 kW, determine the power in the shunt field. Assume a astray load loss of 1% of the load power output (note: Input power generator is equal to the motor brake horsepower, Pin=Pl+Plosses) Choices A. 2034.5 W B.2082.5 W C. 2065.5 W D. 2053.5 W
a shunt generator delivers a 195A at a terminal voltage of 250V. the armature resistance and shunt field resistance are 0.02 and 50 ohms respectively. If the iron and friction losses amount to 950W, determine the power input to the generator.
Determine the efficiency of a 1500kVA, 2300-V, 3-phase, Wye connected alternator, which operates at a rated output, with a power factor of 80%, The DC armature resistance at 0.08-ohm. The field takes a 70-Aat 120-V from the exciter equipment. Friction and windage losses are 35-kW, iron losses is 15-kW and stray power losses is 1.2-kW. The effective armature winding resistance is 1.8 times the DC value.
A 150-kW 250-volt compound generator is connected long shunt. If the shunt field resistance is 20 ohms, what is the series field-current at full load? (Ans.: 612.5 A) write diagram, given, etc
A separately excited generator has no-load voltage of 125V. A certain load rated at 1200W, 120V is then connected at the terminal. Calculate the series resistance needed to connect to the armature circuit in order for the load to operate at rated condition if the armature resistance is 0.0692Ω.
13.a. A bridge circuit is used to measure the loss of larger transformers because the circuitA. promotes safety.B. eliminates calculations.C. increases measuring convenience.D. improves measurement accuracy.13.b. A synchronous machine is run as an unloaded motor. If a low voltage is supplied at the ratedfrequency, and if the full-load armature current flows, a test is being run to determine theA. windage loss.B. I²R loss.C. stray-load loss.D. core loss.
A 220V shunt generator has armature resistance of 0.2 ohms and a shunt resistance of 44 ohms. At rated load, the driving engine develops 62.5HP. if the iron and friction losses amount 1600W, how much is the current delivered to the load at rated condition?
A Y- connected, 10-KVA, 230- has a field winding resistance of 4.59. At an operation of 0.85 lagging power factor, the excitation current is recorded at 10A. the core loss is 300W, and the mechanical loss is 200W. If the corresponding efficiency is 84.9%. calculate the per- phase armature winding resistance.
The armature winding resistance of a long shunt connected DC generator is 0.4ohm, the resistances of the shunt and serial field windings are 125 ohms and 0.1 ohms, respectively. While the generator supplies 8KW of power to the load it feeds, which is the voltage it produces since the output voltage is 250V?
An A 20kW DC shunt generator having an armature circuit resistance of 0.8Ω and a field resistance of 140 Ω, generates a terminal voltage of 230V at full load. Determine the total iron, friction and windage losses if the efficiency of the generator at full load= 83%.
(Draw the Circuit Diagram) A self-excited shunt generator has a field resistance of 60 ohms. When the generator delivers 6 kW, the terminal voltage is 120 V, while the generated emf is 133 V. Determinethe armature resistance

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