Q8. A 240 V, shunt DC motortakes an armature current of20 A when running at 960 rpm.The armature resistance is 0.2ohm.Determine the no load speed ifthe no load armature current is1 A.

Given: Dc shunt motor having, Terminal voltage, V=240 V Armature current, Ia=20 A Speed, N=960 rpm…

Answered: Q8. A 240 V, shunt DC motor takes an…

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

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Q5- Adjust a fire angle for a three-phase full-wave semi-controlled converter to feed the separately exciter DC motor to get a load torque can be reached to 750 rpm. When the supply voltage of converter is 150 volts per-phase and the absorbed current through the armature 40A with resistance 0.2 2 and a constant back emf 0.4v/rpm. Then find the maximum speed for motor assume the previous parameters values are a constant.
1. In CNC machine tools, the motors used to control feed rate are: A. Servo motors B. Induction motors C. Stepper motors D. Hydraulic motors 2. The purpose of a feedback device in a CNC machine tool is to provide information of: A. Speed B. Displacement C. Force D. Both speed and displacement 3. Federate on a machining center can be specified in: A. Only feed per revolution B. Either feed per minute or feed per revolution C. Only feed per minute D. Feed per tooth per revolution 4. The correct syntax of an NC block for inclined line milling operation is: A. N-G01 X-F B. N-G01 Z-F C. N-G01 X-Y F D. N-G01 M XY F 5. When the contour or continuous path system is used, A. Tool movement from one point to the next does not have to follow a specific path. 8. Tool travel is controlled along one axis at a time. C. Machine and tool movements are precisely controlled at all times and in all planes. D. None of the above. 6. Which of the following NC blocks is correct? A. N10 G01 M03 X90 Y-15 R22 B.…
A 220 V, 7 A, 1100 rpm DC shunt motor has armature and field resistance of 1.75 02 and 250 n respectively. The load torque can be assumed to be constant at rated value. What is the motor speed if a resistance of 70 is inserted in the armature circuit?
Q18 / Draw The torque-speed characteristic of a series DC motor.
How can the speed of a shunt DC motor be controlled
Armature resistance of a 230V shunt motor is 0.6 0 and no load current is 5A. When the rotor is loaded it is taking armature current of 60A. The speed is 1200rpm.Estimate the noload speed of a motor. a. 1513.12 rpm b. 1500 rpm O c. 1400 rpm O d. 1404.12 rpm
A brushed DC motor is spinning at a maximum no-load speed of 6206 rpm. The nominal brush voltage drop is 0.67 V and the rated terminal voltage of the machine is 13 V. Determine the voltage constant, Ke, of the machine in Vs/rad.
4. A shunt motor designed to operate at 115 V, has an armature resistance is 0.12 ohms and the motor is taking 60 A in armature current at full load. Determine the value of the external resistance to be inserted in the armature circuit so that the armature current shall not exceed twice its full load value at starting. A. 0.838 ohm C. 0.667 ohm B. 0.919 ohm D. 0.733 ohm
The current drawn by the 230 V DC motor of armature resistance 0.5 ohm and back emf 200 V is ?
An armature controlled DC motor has the following parameters: Tf = 0.03 Nm KT = 0.15 Nm/A Imax = 2.4 A KĘ = 0.15 Vs/rad Wmax = 5000 rpm R = 0.8 Ohms 1. Determine the following: (i) The maximum output torque. (ii) The maximum power output. (iii) The maximum armature voltage. (iv) The no load motor speed when e = Emax 2. Plot the following relationships: (i) Torque versus current (ii) Induced voltage versus speed 3. If the above motor is operated at 3000 rpm with a load torque of 0.15 N.m, determine the armature voltage
Q8/ How can the speed of a shunt dc motor be controlled? Explain in detail.

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Q8. A 240 V, shunt DC motor takes an armature current of 20 A when running at 960 rpm. The armature resistance is 0.2 ohm. Determine the no load speed if the no load armature current is 1 A.