The field coil of a D.C. motor is shunted by a 27002 arc-quenching resistor as shown below: a. Explain what happens in the circuit when the supply is switched off, b. Calculate the total current supplied to the circuit 0.3 seconds after switching on c. Calculate the peak voltage VAB at the instant the supply is switched off (assuming steady state conditions have been achieved before switching off) d. 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) e. Explain the effects on the circuit if the arc quenching resistor was replaced with a 3000 resistor. A 8 Ω Field Coil 2700 m 1.2H Vs = 315V B

The field coil of a D.C. motor is shunted by a 27002 arc-quenching resistor as shown below: a. Explain what happens in the circuit when the supply is switched off, b. Calculate the total current supplied to the circuit 0.3 seconds after switching on c. Calculate the peak voltage VAB at the instant the supply is switched off (assuming steady state conditions have been achieved before switching off) d. 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) e. Explain the effects on the circuit if the arc quenching resistor was replaced with a 3000 resistor. A 8 Ω Field Coil 2700 m 1.2H Vs = 315V B

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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