A 140 V, DC shunt motor drives a constant-torque load at 1100 rpm speed. The armature andfield resistances are 0.9 2 and 155 N, respectively. The motor draws a line current of 10.5 A atthe given load. Answer the following questions.1- Calculate the resistance that should beadded Radd N to the armature circuit to reducethe speed by 85%.RaddRaddΩ2- Calculate the efficiency of the motor withoutthe added Radd N if the rotational losses isM1Vtequal to 147 W.%TEa3- Calculate the efficiency of the motor with theadded Radd Nif the rotational losses is equal to147 W.%4- Calculate the resistance that must be added to the armature circuit to operate the motor atthe holding condition.Radd|||

Given V=140 V N=1000 rpm Ra=0.9 ohm Rsh =155 ohm IL=10.5 A

A 140 V, DC shunt motor drives a constant-torque load at 1100 rpm speed. The armature and field resistances are 0.9 N and 155 N, respectively. The motor draws a line current of 10.5 A at the given load. Answer the following questions. 1- Calculate the resistance that should be added Radd 2 to the armature circuit to reduce the speed by 85%. Radd Radd 2- Calculate the efficiency of the motor without the added Radd SN if the rotational losses is M1 Vt equal to 147 W. n = % 3- Calculate the efficiency of the motor with the added Radd Nif the rotational losses is equal to 147 W. |% 4- Calculate the resistance that must be added to the armature circuit to operate the motor at the holding condition. Radd

A 140 V, DC shunt motor drives a constant-torque load at 1100 rpm speed. The armature and field resistances are 0.9 N and 155 N, respectively. The motor draws a line current of 10.5 A at the given load. Answer the following questions. 1- Calculate the resistance that should be added Radd 2 to the armature circuit to reduce the speed by 85%. Radd Radd 2- Calculate the efficiency of the motor without the added Radd SN if the rotational losses is M1 Vt equal to 147 W. n = % 3- Calculate the efficiency of the motor with the added Radd Nif the rotational losses is equal to 147 W. |% 4- Calculate the resistance that must be added to the armature circuit to operate the motor at the holding condition. Radd

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

A 140 V, DC shunt motor drives a constant-torque load at 1100 rpm speed. The armature and
field resistances are 0.9 2 and 155 N, respectively. The motor draws a line current of 10.5 A at
the given load. Answer the following questions.
1- Calculate the resistance that should be
added Radd N to the armature circuit to reduce
the speed by 85%.
Radd
Radd
Ω
2- Calculate the efficiency of the motor without
the added Radd N if the rotational losses is
M1
Vt
equal to 147 W.
%
T
Ea
3- Calculate the efficiency of the motor with the
added Radd Nif the rotational losses is equal to
147 W.
%
4- Calculate the resistance that must be added to the armature circuit to operate the motor at
the holding condition.
Radd
|||

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