2. A 40 Hp, 460 V, three-phase, 60 Hz, induction motor has an efficiency of 93.6% whenoperating at 75% loading, with a power factor of 83%. The two-wattmeter method is usedmeasure the power drawn by the motor. Wattmeter, W₁, wattmeter has its currentconnected in the yellow line, and its voltage coil between the yellow and red lines.Calculate the power measured by each wattmeter if:a.The motor is star-connected.b. The motor is delta-connected.=Note: 1 Hp 746 WCS Scanned with CamScanner

Answered: 2. A 40 Hp, 460 V, three-phase, 60 Hz,…

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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2. A 3Ø, 2000KW, 480V ∆-connected alternator is short-circuited and is operated at ratedspeed to produce rated current at 4A excitation. With the short-circuit remove andwith the excitation adjusted to 5A, the voltage between stator terminal is 330V. Theeffective resistance between terminal as measured with dc is 2Ω. Determine the %V.R.of the alternator at half-load and pf of 0.8 leading without changing any given values.
A three phase, 3.73 KW, 220-volt induction motor (balanced load) has an efficiency of 86% and operates at 86.6% lagging power factor. An industrial heater is connected in delta consisting of three 36-ohm resistances. Find the kVA _________________ demanded by the combination, the power factor and the line currents,Ia=___________∠_____________,Ib=___________∠_____________,Ic=___________∠_____________. Phase sequence: ABC (please answer in 3 decimal points and clear solution!)
A 1200 kVA, 3.3-kV, three-phase, star-connected alternator has an effective resistance that is 1.5 times the dc resistance. The dc resistance is obtained by connecting two terminals to a dc source. The current and voltage are 87.6 A. and 6V, respectively. A field current of 30 A produces a current of 200 A on short-circuit and 1.1 kV on open circuit. a. Calculate the power angle and the total generated complex power when the generator is operating full-load of 1200 kVA at 0.9 pf lagging and at rated terminal voltage. Assume that flux varies as the field current. b. If the altenator is operating at the same excitation voltage as in (a), calculate the maximum kW output of the alternator.
PROBLEM 5.5A 50 KVA, 2300 volt, 3 phase, 60 hertz star connection alternator has an effective resistance between terminals 0.6ohms, a reactance of 1.6 ohms / phase. Calculate the electromotive force induced when the alternator supplies the nominal current to a load that has:A) Unit power factor.B) Power factor 0.8 (-).C) Power factor 0.8 (+)
A three-phase, 11kV, star-connected alternator delivers a current of 80A at (a)0.85 pf leading, (b) unity power factor, (c)0.7 power factor lagging. Full-load current of 80A is produced on short circuit by a field excitation of 2.9A. An emf of 400V per phase is produced on open circuit by the same excitation. The effective armature resistance is 0.85 ohm per phase. Determine the voltage regulation in each case.
Please show a complete solution to the problem 6. A 540 V, 50 Hz, 3-phase circuit takes 31 A at a lagging power factor of 0.88. A synchronous motor is used to raise the power factor to unity. Calculate the numerical value of the power factor, in per unit, of the synchronous motor when driving a mechanical load of 7.7 kW. The motor has an efficiency of 85%. Give your final answer in 3 decimal places. Correct Answer: 0.550 ± 0.001
Q.1 A 5000 kVA, 6600 V , 3 - phase , star connected alternator has a resistance of 0.75 ohm per phase. Estimate by zero power factor method the regulation for a load of 500 A at power factor (a) unity, (b) 0.9 leading and (c) 0.71 lagging, form the open circuit and full load, zero power factor curves: Field current, A Open circuit voltage, V ZPF curve, V 32 3100 0 50 4900 1850 75 6600 4250 100 7500 5800 140 8300 7000
A 230V, 50Hz, single phase motor takes a current of 4A and has a PF of 0.6 lagging. A capacitor in connected in parallel with the motor and takes a current of 3.8A. Calculate the value of new supply current and its power factor. A- Active current component is= B- Reactive current component is C- Reactive current component with capacitor is D- new current= E- new power factor =
A 300 HP balanced three-phase motor operates at 10√3 KVrms with a power factor of 0.8(-). The motor is in parallel with a power factor heating system unitary. a) If the power input of the installation has a power factor of 0.9(-), What is the three-phase power demanded by the oven? b. Indicate the operating current of the motor in phase a. note that 1 HP is equal to 0.746 KW. to.
A 3 phase, 50-Hz, star-connected, 2,00 kVA, 2,300-V alternator gives a short-circuit current of 600A for a certain field excitation. With the same excitation, the O.C. voltage was 900V. The resistance between a pair of terminals was 0.12 Ω. Find the full-load regulation at (a) unity p.f., (b) 0.85 p.f. lagging, (c) 0.85 p.f. leading.
Two wattmeters connected to a three-phase 440V squirrel cage induction motor indicate a total of 12kW.If the operating power factor of the motor is 0.4,determine the individual reading of the wattmeters. Show your solution.
a) With the aid ofa diagram, explain how you would improve the power factor ofan inductive load using synchronous motor marks] 8 b) b synchronous motor when connected parallel with the load improves the power factor of a load of 200KW from 80 lagging to 0.9 lagging. Simultaneously the motor carries a load of 80 KW. Calculate: The leading KVAR supplied supplied by the motor F The KVA rating of the motor The power factor at which the motor operates

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