Q2) A 4-pole, 240V, lap-wound, series motor has armature and series field Ra resistance of 0.3 ohm, and 0.025 ohm respectively. There are 672 armature conductors. If the flux per pole is 0.25 Wb, and the total torque developed in the armature is 348 Nm, find the current taken by the motor, and its speed.

Q2) A 4-pole, 240V, lap-wound, series motor has armature and series field Ra resistance of 0.3 ohm, and 0.025 ohm respectively. There are 672 armature conductors. If the flux per pole is 0.25 Wb, and the total torque developed in the armature is 348 Nm, find the current taken by the motor, and its speed.

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

current - 1=?, and the power factor - cosp =?. 4. An out of balance three phase star connected load has the following complex currents: I₁ = lejº,A, I₂ =le¯6⁰,A and I₁=1e¹j6⁰, A. This load is supplied by a four wire power line from a balance voltage source. Find the r.m.s. value of the neutral current Io =? Wait to th
A 6 pole, wave wound DC shunt generator has a useful total flux of 420 mWb. The armature winding consists of 220 turns each of 0.004 2 resistance, when running at 900 RPM the armature current is 50 A. If the armature winding reconnected as lap calculate the terminal voltage in case of wave and lap given that the field circuit and the speed are kept same.
3. A 4 pole, 250 dc shunt motor has a lap connected armature with 960 conductors. The flux per pole is 2 x 102Wb. Calculate the torque developed by the armature and the useful torque in N-m when the current taken by the motor is 30A. The armature resistance is 0.12 ohm and the field resistance is 125ohm. The rotational losses amount to 825W
Colve asap
Q3. Write if the shown statements are TRUE or FALSE. 1- In DC machine the induced e.m.f is proportional with flux only. 2- The Ta/l a graph of a d.c. series motor is a straight line throughout. 3- In a DC motor the direction of the shaft rotation can be change by changing the polarity of the power supply. 4-The critical resistance is less than armature resistance in shunt generator. 5-As the load is increased, the speed of a d.c. shunt motor increases slightly.
Developed torque??
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 .
None
Q2) Determine the back e.m.f at this load of series motor has a series field resistance of (0.301 2) and an armature resistance of (0.1892).It is connected to a (220 V) supply and at a particular load runs at (1500 r.p.m) when drawing (16.2 A) from the supply, if that this cases a three times of flux. Calculate the speed of motor when the load is changed such that the current is increased to (32.23 A).
Reducing the supply voltage so that Vnew = Vold / V3 reduces the maximum torque of the motor so that Tmaxnew= ...Tmaxold . * .... ...
A 440 volt d.c. The armature resistance of the motor is 0.25 ohm. It takes an armature current of 60 A at 750 RPM. So find the value of torque produced in the motor.