The armature resistance of a 30HP, 250V DC series motor is 0,4 ohms and the series field resistance is 0.08 ohms. Calculate the backemf when the series motor takes 20A.Select the correct response:120,5V247.6V230.8V240.5V

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Answered: Select the correct response: 120,5V…

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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A 250V dc short-shunt motor takes a current of 5A. The shunt, armature, and series field resistances are 100 ohms , 0.25 ohms, and 0.80 ohms respectively, what is the SPL?
A 40Hp,220V shunt motor delivers full load at 950 rpm and has an efficiency of 90%. The armature and field resistances are 0.2ohm and 110 ohms, respectively. Determine the starting resistance such that the starting armature current does not exceed 1.7times the full load current.
a 120v dc shunt motor has an armature resistance of 0.25 ohms is drawing 50a. if a fixed loss of 200w was measured and neglecting the shunt field what is the bhp of the motor in Hp? (meaning no shunt field used)
A 120V dc shunt motor has an armature resistance of 0.25Ω is drawing 50A. If a fixed loss of 200W was measured and neglecting the shunt field, what is the copper loss (in watts)? (meaning no shunt field used)
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A 220 V, 24A, 1000 rpm, separately excited dc motor has an armature resistance Of 0.02 Ω. Motor is controlled by chopper and source voltage of 230V. Determine Emf induced at 350 rpm, Output voltage of chopper at 1.2 times the rated torque and braking operation.
Sketch the cross-section of a reluctance stepper motor that has six stator poles and eight rotor poles. Your sketch should be similar to Figure 16.33(a) on page 828. Label the windings and specify the sequence of activation for clockwise rotation. What is the rotation angle per step?
A 6600 V, three phase, start connected synchronous motor draws a full loadcurrent of 70 A at 0.8 p.f. leading. Find the efficiency of the straypower losses total 30 kW and the armature resistance is 2 ohms and thereactance is 20 ohms per phase.
A 50 Hp 250V, 1200 R/Min DC shunt motor with compensating winding has an armature resistance (including the brushes, compensating winding and inter poles) of 0.06 ohms. If the field resistance Radj + Rf is 50 ohm which produces no load speed of 1200r/min. there are 1200 turn per pole on the shunt field winding. Find the speed of the motor when its input current is 100A, 200A and 300A. Plot speed torque characteristic of above machines.
A 100hp, 250 V, 1200 rpm shunt DC motor with an armature resistance of 0.03 Ω and a field resistance of 41.67 Ω. The motor has compensating windings, so armature reaction can be ignored. Mechanical and core losses may be assumed to be negligible for the purposes of this problem. The motor is assumed to be driving a load with a line current of 126 A and an initial speed of 1103 rpm. To simplify the problem, assume that the amount of armature current drawn by the motor remains constant. what is the motor's speed if the field resistance is raised to 50 Ω? can you help me to find N2?
The armature resistance of a compound direct current motor with a short shunt connection is 0.15Ω , series winding resistance 0.25Ω and shunt winding The resistance is given as 800Ω. The armature of the DC motor with a terminal voltage of 120 is 1400 rpm. If it draws 12 amps from the motor terminals while rotating, the torque produced by the motor and Find the efficiency of the engine.
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Select the correct response: 120,5V 247,6V 230.8V 240,5V