A 8Ω Field Coil m 1.2H 270Ω Vs = 315V B

Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
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The field coil of a D.C. motor is shunted by a 270Ω arc-quenching resistor as shown below:

 

  1. Explain what happens in the circuit when the supply is switched off,

 

  1. Calculate the total current supplied to the circuit 0.3 seconds after switching on

 

  1. Calculate the peak voltage VAB at the instant the supply is switched off (assuming steady state conditions have been achieved before switching off)

 

  1. Calculate the time taken for the coil current to fall to 20% of its normal running value after the supply is switched off (assuming steady state conditions have been achieved before switching off)
A
8Ω
Field Coil
m
1.2H
2700
Vs = 315V
B
Transcribed Image Text:A 8Ω Field Coil m 1.2H 2700 Vs = 315V B
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