Q/ A 480 V, 988 r.p.m. d.c. shunt motor its full-load efficiency of 88 percent. The armature circuit resistance is 0.19 N, the motor input current is 72 A and there is total voltage drop of 1.8 V at the brushes. The field current is 1.66 A. Determine (i) The motor output power (ii) The mechanical torque in N-m .

Q/ A 480 V, 988 r.p.m. d.c. shunt motor its full-load efficiency of 88 percent. The armature circuit resistance is 0.19 N, the motor input current is 72 A and there is total voltage drop of 1.8 V at the brushes. The field current is 1.66 A. Determine (i) The motor output power (ii) The mechanical torque in N-m .

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...

See similar textbooks

Similar questions

(480 V DC shunt motor has a starting current I, 126 A from the source. Total resistance value of shunt field circuit is Rsh-80 2. Line current value under full load conditions is I-21 A. Find the E₁ (reverse EMF) value under full load conditions. A serial connected. R resistance is located between the power source and the input terminals of the motor to limit the starting current to 42A. Find the value of this resistance R. able and wei he mac chand have) EA= R=
answer part d only
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 400 V series motor has a field resistance of 0.02 ohm and an armatureresistance of 0.1 ohm. The motor takes 30 A of current at 1000 rpm whiledeveloping full load torque. What is the motor speed when this motordevelops 60 % of full load torque and the shunt is shunted by a resistorof 0.03 ohm? [Ans. 1294.98 rpm]
The armature resistance of a shunt motor fed from a 220 Volt DC source is 5 ohms and the resistance of the excitation winding is R ohm and it rotates stably. Then, a resistance of R ohm is added to the excitation circuit (a resistor with the same value as the winding resistance) to control the speed. How many RPM is the motor in the last state in steady state.Mechanical losses will be neglected, motor magnetically linear, no saturation, temperature change will be neglected.Armature current = Ia = 3 ALoad torque=Tload= 8 Nma) 143 rpmb) 734 rpmc) 1361 rpm d) 77 rpm e) 1333 rpm
A 3-phase 50 Hz I.M. has a rated torque = 16.7 N.M and maximum torque = 40.5 N.M. If its rated speed = 910 R.P.M, the :speed at maximum torque will be %3D R.P.M 578.28O R.P.M 421.640 R.P.M 590.160 None O
answer all parts please
Q4) What is the effect in series motor if you assume V = Eb , with low resistance fielding winding ? a) b) The given information about series motor on full – load (with that the flux is proportional to the field current) is a ) takes ( 78A) and runs at (850 r.p.m) , the series winding resistance is (0.04 2) , with diverter in parallel with the field winding is a (0.18 2) and the armature resistance is (0.09 S2). ( 220 V Neglected the iron, friction and windage losses. Determine the efficiency , speed when developing full load torque ,the maximum efficiency .
A 400 V, 50 Hz 30 hp, three-phase induction motor is drawing 50 A current at 0.8 power factor lagging. The stator and rotor copper losses are 1.5 kW and 900 W respectively. The friction and windage losses are 1050 W and the core losses are 1200 W. The air-gap power of the motor will be
A 2 hp 50 Hz 3-phase 220 V delta wired induction motor has a full-load rated speed of 1400 rpm. a) How many poles does the motor have? b) Calculate its rated output torque. c) What is the slip at full load? d) If the current is 6.37 A with a power factor of 0.79 at full load, what is the efficiency of the motor? e) Calculate the torque and approximate speed at ½ load. f) If a variable frequency drive were used to control the speed of this motor, what is the approximate maximum speed for the load from e)? What frequency would the drive be set to? Please answer all subpart either dislike is ready please all subpart in short please
Please answer only handwritten accepted...I will like that solution.. Please clear handwriting.. Please.. .
The armature resistance of a shunt motor fed from a 220 Volt DC source is 5 ohms and the resistance of the excitation winding is R ohm and it rotates stably. Then, a resistance of R ohm is added to the excitation circuit (a resistor with the same value as the winding resistance) to control the speed. How many RPM is the motor in the last state in steady state.Mechanical losses will be neglected, motor magnetically linear, no saturation, temperature change will be neglected.Armature current = Ia = 4 ALoad torque=Tload= 7 Nm