When a small a-c motor is operating at rated load from a 115-volt 60-cycle source, it takes 287 watts at a lagging power factor of 0.6. (a) ·Calculate the line current. (b) What should be the̟capacitance of a capacitor connected in parallel with the motor that will make the` power faetor unity? (c) Determine the line current under the condition in (b).

When a small a-c motor is operating at rated load from a 115-volt 60-cycle source, it takes 287 watts at a lagging power factor of 0.6. (a) ·Calculate the line current. (b) What should be the̟capacitance of a capacitor connected in parallel with the motor that will make the` power faetor unity? (c) Determine the line current under the condition in (b).

Power System Analysis and Design (MindTap Course List)

6th Edition

ISBN:9781305632134

Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Chapter12: Power System Controls

Section: Chapter Questions

Problem 12.4P

See similar textbooks

Similar questions

The single - phase ac voltage controller with inductive load. Plot the waveform of output voltage and voltage in each thyristor if the B = 10 %3D degree and delay angle (alpha) in both thyristor is 1- (30 degrees) 2- (90 degrees) 3- (120 degrees)
When a small a-c motor is operating at rated load from a 116-volt 60-cycle source, it takes 287 watts at a lagging power factor of 0.6. (a) Calculate the line current. (b) What should be the capacitance of a capacitor connected in parallel with the motor that will make the power factor unity? (e) Determine the line current under the condition in (b).
The winding of a 4-pole alternator having 36 slots and a coil span of 1 to 8 is short-pitched by ........... degrees. 150 40. 90 20 Brushless excitation system consisting of: Stator field winding and power diodes stator and rotor field winding and capacitor stator and rotor field winding and power diodes Everything mentioned in the options Full Name : *
Maz a) A sinewave is having a frequency of 50 Hz and instantaneous value of 250 Volts at 1.3 milli seconds. Find D The maximum value of sinusoidal voltage waveform and i) The value of voltage at 2.1 milli seconds. b) Determine the instantaneous equation for the voltage waveform shown in figure, if Vp=100 Volts, Time period is 10 milli seconds and 0 =40 degrees. on Vp Upload your Answers steps in the "Final Answer Submission" Link provided in the Moodle. a) (i) Maximnum value = a) (ii) Value of voltage at 2.1 ms = b) Angular frequency =
A DC series generator is supplying a current of 5A to a series lighting system through a feeder ofto total resistance, 1.0 ohm. The terminal voltage is 2500 V. The armature and series fieldresistances are respectively 18 and 15 ohms respectively. A 30-ohm diverter resistance isshunted across the series field. Determine the power developed in the armature of thegenerator?
Difference between three phase and single phase induction motor... Don't copy from other websites otherwise you will get thumbs down...
What will be the operating power factor of a 3-phase induction motor, whose ratings are 230 V, 50 Hz, 120 hp, and 4-poles? Motor is operating at rated conditions with an efficiency of 92% and draws a line current of 260 A. The core loss and stator copper losses are 1710 W and 2830 W respectively. (a) 0.85 (c) 0.93 (b) 0.90 (d) 0.80
A short shunt compound generator supplies 100A at 110V. Armature resistance is 0.050 and the shunt field resistance is 570 and the series field of resistance is 0.042. if the SPL is 852, determine a)Eg b)Copper lossesin b.1)armature b.2)series b.3)shunt c)n
14/. The purpose of brushes in a dc machine is__________. to change ac to dc signal to remove the losses in machine to collect voltage from windings avoid spark for current
A three-phase, 4-pole, 1,500 rpm alternating having a double layer-windings with 18 turns per coil. The slots per pole per phase are 10 and the coil span is 22 slots. The spread phase is 60 degrees and the flux per pole is 0.0625 Weber. If the armature windings are wye connected. a) Determine the generated voltage per phase and the line to line voltages. b) If the alternator is delivering a three - phase load of 1,200KW at 0.8 lagging power factor what is the line current of the alternator
1- The compole is used to 2- A 4-pole wave winding machine has ------ magnetic circuit. 3- A commutator pitch for the duplex wave winding is equal to - 4- A 2-pole triplex lap winding will have parallel paths. 5- A 6-pole lap wound generator has 900 conductors. The e.mf induced per one turn being 3V. the generated voltage of the grnerator is ( 6-A 10kW, 250 V shunt generator has armature and field resistance of 0.2 and 502 respectively. Then the generated voltage is and
T-a. The direction of rotation of a single-phase split-phase motor can be change by........ a) reversing the connection of the start winding b) reversing the connection of the run winding c) reversing the connection of the start and run winding at the same time d) "a" or "b", not "c" T-b. Single-phase split-phase motors using an electrolytic capacitor in the start winding circuit should not be cycled more than about__________ time per hour. a) 8 b) 12 c) 24 d) none of the above T-c. When replacing the capacitor in a capacitor-start induction-run motor, one must be sure to replace the bad capacitor with__________ . a) a smaller one b) one of the same size c) a larger one d) none of the above