(a) A d.c. shunt motor takes an armature current of 30 A from a voltage supply given 210V. Armature circuit resistance is 0.25 Q. For reducing the speed to 40% of rated speed, calculate the resistance to be added in the series with the armature considering (i) the load torque is constant (ii) the load torque is proportional to the square of the speed. (b) A d.c. series motor runs at 1500 rpm with terminal voltage given 210v load torque, taking a current of 16 A. The resistance of the armature brushes, and field coils is at a quarter full- 0.25 2. Calculate its speed at half-load torques. Assume that the magnetic field is unsaturated.

(a) A d.c. shunt motor takes an armature current of 30 A from a voltage supply given 210V. Armature circuit resistance is 0.25 Q. For reducing the speed to 40% of rated speed, calculate the resistance to be added in the series with the armature considering (i) the load torque is constant (ii) the load torque is proportional to the square of the speed. (b) A d.c. series motor runs at 1500 rpm with terminal voltage given 210v load torque, taking a current of 16 A. The resistance of the armature brushes, and field coils is at a quarter full- 0.25 2. Calculate its speed at half-load torques. Assume that the magnetic field is unsaturated.

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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