Q18. What will be the operating power factor of a 3-phase induction motor, whose ratings are 230 V, 50Hz, 120 hp, and 4-poles? Motor is operating at rated conditions with an efficiency of 92% and draws aline current of 260 A. The core loss and stator copper losses are 1710 W and 2830 W respectively.(а) 0.85(c) 0.93(b) 0.90(d) 0.80Q19. A 3-phase, 420 V, 60 Hz, Y-connected synchronous generator, with a synchronous reactance of1.20 Ohm per phase is connected to an infinite bus. The power angle, when supplying 110 kW to the busis 30 degree. What will be the total apparent power (in kVA) injected by this generator to infinite bus?(а) 118.28(c) 110.52(b) 118.74(d) 100.39

In this question we will find operating power factor of induction motor... Note :- as per our…

Q18. What will be the operating power factor of a 3-phase induction motor, whose ra Hz, 120 hp, and 4-poles? Motor is operating at rated conditions with an efficiency line current of 260 A. The core loss and stator copper losses are 1710 W and 2830 W1 (а) 0.85 (с) 0.93 (b) 0.90 (d) 0.80 010 phogo 120 V 60 H. nnooted qur Lononotor u

Q18. What will be the operating power factor of a 3-phase induction motor, whose ra Hz, 120 hp, and 4-poles? Motor is operating at rated conditions with an efficiency line current of 260 A. The core loss and stator copper losses are 1710 W and 2830 W1 (а) 0.85 (с) 0.93 (b) 0.90 (d) 0.80 010 phogo 120 V 60 H. nnooted qur Lononotor u

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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QI: The parameters of a 4 kW, 220V. 2-phase induction motor, in ohms per phase, are: r1=0.53, x1 =2.4, XM= 70, r2 = 0.96, x2 = 3.0. The motor is operated from unbalanced 2- phase source whose voltages are 230V and 210V, the smaller voltage is lagging the larger by 800. For a slip of 5% and rotational losses of 30 W, find the positive- and negative- sequence components of: (a) the applied voltages. (b) Find the values of phase currents (c) the input current. (d) Find the developed mechanical power. (e) Find the efficiency.
A three-phase Y-connected 230-V (line-to-line) 7.5-kW 60-Hz six-pole induction motor has the following parameter values in Ω/phase referred to the stator: R1 = 0.294, R2 = 0.144 X1 = 0.503, X2 = 0.209, Xm = 13.25 The total friction, windage, and core losses may be assumed to be constant at 403 W, independent of load. For a slip of 4 percent, determine: (a) stator current, power factor, (b) output torque and power,(c) efficiency when the motor is operated at rated voltage and frequency, (d) the load component 12 of the stator current, the induced torque Tind, and the converted power Pconv for a slip s= 0.04,(e) the maximum torque and the corresponding speed; and (f) the starting torque Tst and the corresponding stator load current 12 start
A 4 pole three-phase cage rotor induction motor running at full-load draws a stator current of 80 A at apower factor of 0.83 lagging from a 440 V, 50Hz supply. Under this condition the stator loss is 4 kW,the rotor loss is 1.5 kW, and the percentage slip is 5%. If the shaft output power is 32 kW, calculate (a)the shaft output torque, (b) the efficiency, and (c) the mechanical (friction and windage) loss.
A single-phase, six-pole, capacitor start, 120V/60Hz induction motor, has the following parameters:R1=1.48Ω R2=3.2 ΩX1=2.05 Ω X2=1.6 ΩThe core losses are negligible, while the friction and windage losses are constant Pf,wi=20W. The motor is operating at the rated voltage and frequency with its starting winding open, and the motor’s slip is 4.5%. Calculate:a) Stator current and power factor of the machineb) Developed electromechanical torque and the load torquec) The motor efficiency
3. A group of induction motors rated 2200-V, 3-phase, 60 Hz delivers a total of 600 HP and is operating at an average power factor of 0.8 lagging. If half of this total load is replaced by a group of synchronous motors operating at 0.8 leading, determine the difference in the line current? Assume all motors operate at an average efficiency of 90%.
A 3-phase induction motor having a synchronous speed of 1200 rpm draws 70kW from a 3-phase feeder.The copper losses and iron losses in the stator amount to 4kW.Friction and windage losses amount to 2kW.If the motor runs at 1170 rpm, determine the a. active power transmitted to the rotorb. rotor copper lossesc. mechanical power developedd. the mechanical power delivered to the loade. efficiency of the motor.
A 500-V, 50-kVA, single-phase alternator has an effective resistance of 0.2 Ω. A field current of 10A produces an armature current of 200A on short-circuit and emf of 450V on open circuit. Calculate (a) the synchronous impedance and reactance and (b) the full-load regulation with 0.8 p.f. lagging.
The stator resistance of a 1-phase induction motor is 2.5 ohms and its leakage reactance is 2.0 ohms. Onno-load, the motor takes 4 A at 96 V and at 0.25 lagging power factor. The no-load friction andwindage loss is negligible. Under the blocked-rotor condition, the input power is 130 W at 6 A and42 V. Obtain the equivalent circuit parameters.
An induction motor draws 50 A from a 450 V, three-phase line at a lagging power factor of0.75. Its stator and rotor copper losses are 950 W and 500 W, respectively. Its core lossesare 400 W, the friction and windage losses are 150 W. Determine the following(a) The air-gap power and the developed mechanical power.(b) The shaft output power and the motor efficiency
The Power supplied to a Three - Phase Induction Motor is 50 KW and the Stator Losses are 2 KW. If the slip is 4 % , determine the : ( a ) Rotor Copper Loss , ( b ) Total Mechanical Power Developed by the Rotor . ( c ) Output Power of the Motor if Friction and Windage Losses are 1 KW , and ( d ) Efficiency of the Motor , neglecting Rotor Iron Losses .
A 3Ø induction motor having a star-connected rotor has an induced emf of 80V betweenslip-rings at standstill on open-circuit. The rotor has a resistance and reactance per phase of1Ω and 4Ω respectively. Determine the value of a delta connected rheostat connected tothe rotor slip-rings and the pf of the rotor circuit when the starting line current is 14.14A
1.Show that if three phase currents, each of equal magnitude and differing in phase by 120degree, flow in a three phase winding that are 120 degree apart from each other then it willproduce a rotating magnetic field of a fixed magnitude. 2. A three phase, 5-hp, 60Hz, 115V, 4-pole induction motor is operating at rated voltage, rated frequency, and 125 percent rated load has an efficiency of 85.4 percent. The stator conductor loss, rotor copper loss and core loss are 223.2W, 153W, and 114.8W respectively.Sketch the power flow diagram, enter the given data, and determine i) shaft speed ii) shaft torque 3. Can single phase induction motor be self-started? Explain the operation of a split phase single phase induction motor?