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Assume a four pole, lap wound, long shunt compound (cumulative) d.c. generator with an armature resistance of 0.020, field resistance of 0.042 and a shunt resistance of 10Q. The armature has 120 conductors in the slots and runs at 1000rpm. The generator supplies three loads connected as follows: i. A7.2kW motor and a 2.4kW geyser connected in parallel and a a 1.8kW lighting load in series with the parallel combination in (i) above the voltage across the geyser is measured to be 240V ii. Neglect friction, rotational losses and assume a brush drop of 1.8V then: a. calculate the armature induced voltage b. calculate the flux per pole c. calculate the efficiency of the machine

Assume a four pole, lap wound, long shunt compound (cumulative) d.c. generator with an armature resistance of 0.020, field resistance of 0.042 and a shunt resistance of 10Q. The armature has 120 conductors in the slots and runs at 1000rpm. The generator supplies three loads connected as follows: i. A7.2kW motor and a 2.4kW geyser connected in parallel and a a 1.8kW lighting load in series with the parallel combination in (i) above the voltage across the geyser is measured to be 240V ii. Neglect friction, rotational losses and assume a brush drop of 1.8V then: a. calculate the armature induced voltage b. calculate the flux per pole c. calculate the efficiency of the machine

Introductory Circuit Analysis (13th Edition)
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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Question 1 Assume a four pole, lap wound, long shunt compound (cumulative) d.c. generator with an armature resistance of 0.020, field resistance of 0.04 and a shunt resistance of 10Q. The armature has 120 conductors in the slots and runs at 1000rpm. The generator supplies three loads connected as follows: i. A7.2kW motor and a 2.4kW geyser connected in parallel and a a 1.8kW lighting load in series with the parallel combination in (i) above the voltage across the geyser is measured to be 240V ii. Neglect friction, rotational losses and assume a brush drop of 1.8V then: a. calculate the armature induced voltage b. calculate the flux per pole c. calculate the efficiency of the machine
Transcribed Image Text:Question 1 Assume a four pole, lap wound, long shunt compound (cumulative) d.c. generator with an armature resistance of 0.020, field resistance of 0.04 and a shunt resistance of 10Q. The armature has 120 conductors in the slots and runs at 1000rpm. The generator supplies three loads connected as follows: i. A7.2kW motor and a 2.4kW geyser connected in parallel and a a 1.8kW lighting load in series with the parallel combination in (i) above the voltage across the geyser is measured to be 240V ii. Neglect friction, rotational losses and assume a brush drop of 1.8V then: a. calculate the armature induced voltage b. calculate the flux per pole c. calculate the efficiency of the machine
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