Please answer in typing format 4) A series-connected dc motor is shown in Fig-4 below has RA = 0.52 andRF = 1.52. In driving a certain load at 1500 rpm, the current IA = 20Afrom a source voltage of Vr = 220V. The efficiency is 80%. Find theoutput power and the rotational loss.+VTLFField0000IA=IFArmatureRFRAw+EAFigure-4.1

Step 1:since the field is in series with armature so it is a series dc motor and the current flowing…

Answered: 4) A series-connected dc motor is shown…

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 DC motor is initially at rest and is then connected to a 12V battery. The motor has aresistance of 2 Ohms and an inductance of 0.5 Henrys. The motor has a torque constant of0.1 Nm/A and a back EMF constant of 0.1 V/(rad/s). Determine the current through themotor as a function of time, and the time it takes for the motor to reach 90% of its finalsteady-state speed.
6. The motion in DC motor can be increased by the following factors... (you may choose more than one) * a) Using a stronger magnet b) Increasing the potential difference c) Increasing the current d) Increasing the number of turns on the coil
The resistance of the field winding(copper wire) of a DC machine is 0.25 ohm at 25°C. When operating at full-load, the temperature of the winding is 75 °C. The temperature coefficient of resistance of copper is 0.00427 per °C at 0°C. Find the resistance of the field winding at full-load.
• A DC shunt machine while running as generator develops a voltage of 250 V at 1000 r.p.m. on no-load. It has armature resistance of 0.5 ohm and field resistance of 250 ohm. When the machine runs as motor, input to it at no-load is 4 A at 250 V. Calculate the speed and efficiency of the machine when it runs as a motor taking 40 A at 250 V. Armature reaction weakens the field by 4 %
A 250 V series motor has an armature resistance of 0.2 ohm and a series-fieldresistance of 0.18 ohm. If the speed is 6oo RPM when the current is 32 amps.What will be the motor speed when the load is reduced so that the current is18 amps, under which condition the percent flux change is 50 % of the percentcurrent change.
A250 V, dc. shunt mtor has an amature resistance of 0.5 chmand a field resistance of 250 dhm When driving a load of canstant tarque at 600 r.pm, the ammature current is 20 A If it is desired to raise the speed fram600 to 800 r.p.m, what resistance should be inserted in the shunt field circut? Assume that the magnetic circut is unsaturated
1. The operation of Commutator in DC Motor is * O a) to convert dc to ac O b) to convert ac to dc O c) to convert fixed dc to variable dc O reverse the current direction in the rotating windings each half turn
A long shunt dynamo running at 1000 rpm supplies 22kw at a terminal voltage of 220V. The resistance of the armature, shunt feild and series field are 0.06, 114 and 0.06 respectively. The overall efficiency at the above load is 88%. Find: A. Copper loss B. Iron and friction losses C. Torque exerted by the prime mover
An induction motor having full load torque of 60 Nm when delta-connected develops a starting torque of 120 Nm. For the same supply voltage, if motor is changed to star -connection, then starting torque developed will be Nm.
A motor’s rotor spins at 1,000 rpm when no load is applied (i.e. torque = 0), but reduces to 900rpm when the rated torque of 2.3 N-m is applied. Determine the speed regulation and output horsepower at the rated load condition. If the motor’s input power is 500 Watts at the rated load condition, what is the efficiency?
A DC Series motor, 500V, has a total resistance of 0.5 Ω. At plain load, the current is 100 A at a speed of 6 rev / s. At reduced load, the current is 50 A with a speed of 10 rev / s. Consider that the torque is proportional to the current on this scope. What is the current of the motor when the induced torque is 786 N·m? What resistance value should be added so that the speed is 6 rev / s at 786 N·m?
A 220V dc shunt motor takes 4A at no load and runs at 700 rpm. Ra = 0.60 ohm and Rsh = 110 ohms. What is the efficiency of the motor when the motor input is 8800 W? a. 81.67% b. 80.2% c. 82.05% d. 79.44%

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