write true or false in the following sentences :. 1-Two quadrant operation of de motor can be obtained from thee phase semiconverter. 2_de - de four - quadrant - drives can be supply high power than ac - de four - quadrant drives. 3- Principle of regenerative brake control of de motor applied by using step down choppers..

write true or false in the following sentences :. 1-Two quadrant operation of de motor can be obtained from thee phase semiconverter. 2_de - de four - quadrant - drives can be supply high power than ac - de four - quadrant drives. 3- Principle of regenerative brake control of de motor applied by using step down choppers..

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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5- The rotor voltage per phase of a slip-ring star connected induction motor is 289.5 V. The rotor resistance and standstill leakage reactance are 50 and 8 ohm per phase respectively. Determine. (i) the rotor current and power factor at start with slip-rings shorted (ii) the rotor current and power factor at 4% slip with slip-rings shorted (iii) the external rotor resistance per phase required to obtain a starting current of 20 A in the rotor lines.
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A 13.8-kV 10-MVA 0.8-PF-lagging 60-Hz two-pole Y-connected steam-turbine generator has a synchronous reactance of 12 2 per phase and an armature resistance of 1.5 2 per phase. This generator is operating in parallel with a large power system (infinite bus). (a) What is the magnitude of E, at rated conditions? (b) What is the torque angle of the generator at rated conditions?
Q2. (a) (i) Discuss briefly the use of a damping winding to start a three- phase synchronous motor. (ii) A 2200V, 3-phase star connected synchronous motor has a per phase resistance and per phase reactance of 0.20 and 2.10 respectively. Determine the value of the back emf per phase if the motor operates at a 50% power factor and at a line current of 198A.
P-1). All dual-voltage single-phase split-phase motors have two sets of start windings. a) true b) false P-2). Which of the single-phase split-phase motors listed below is designed to have its start winding energized while running. a) resistance-start induction-run b) capacitor-start induction -run c) capacitor-start capacitor-run d) all of the above P-3).Which of the capacitors listed below has the longer duty cycle because it can dissip eat better? a) electrolytic b) oil
The stator resistance of a 1-phase induction motor is 2.5 ohm and its leakage reactance is 2.0 ohm. 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.
04. (a) (i) Discuss the operating principle of an induction generator. (ii) Discuss TWO advantages and two disadvantages of Double Fed Induction Generator (DFIG) over Squirrel Cage Induction Generator (SCIGO in wind turbine technology.
A three phase synchronous motor of 60HZ, has the stator winding with pitch angle of 90°, distribution angle of 20°, with number of slots per pole per phase of 20, and magnetic field flux density of 100mWeb/cm? spread over an area of 15 mm?. The number of turns in the stator winding is 1000. Calculate, i. Fundamental component of EMF induced in stator winding. ii. 2th order (harmonic) component of EMF induced in stator winding. iii. 4th (harmonic) component of EMF induced in stator winding. iv. RMS value of the EMF induced in stator winding
P6) A 3 phase, 2300V, 60HZ12-pole, Y-connected synchronous motor has X, = 4.5 ohm and negligible stator resistance. The machine is connected to an infinite bus. And draws 250 A at a 0.8 pf lagging. a) Determine the output power (neglect rotational losses) b) Determine the power to which the motor can be loaded slowly without losing synchronism. Determine the torque, stator current, and supply power factor for this condition.
7. The total rotational losses of an induction motor are a combination of ------- A) Friction losses B) Windage losses. D) Stray losses. C) Core losses. 8. The developed mechanical power can be calculated using the equation of- A) PAG - PRCL. B) PAG w sync C) (1-s) PAG. D) 3 E2Gc. 9. For an induction motor, if the synchronous speed is 1800 r/m, and the rotor speed 180rad/sec, then the slip will be: A) 5.5% C) 6% B) 4.5% D) 4% 10. The power losses in the stator part of the induction motor are B) Core losses D) Friction and windage losses A) Stator copper losses C) Air-gap losses
b) A 415V, 50HZ, 3-phase induction motor supplies its rated power to a constant load. The rated speed of the motor is 980 rpm. Identify the pole number of the motor and calculate the rate slip () (ii) Draw the circuits for the no-load and block-rotor tests and indicate the slip for each of the tests. (iii) If the supply voltage is changed to 332V and 40HZ, calculate the motor speed, slip frequency, and slip.
25.a. The stray load loss of a wound rotor induction motor can be determined byA. applying a predetermined current to the stator and subtracting the I²R loss from the input power.B. exciting the rotor with a-c voltage and driving it at synchronous speed in the opposite direction.C. driving the rotor in the normal direction by an external power source.D. measuring the total losses and adding the other losses.25.b. Excitation losses in a transformer must be determined. When running the test, you should make surethat the secondary windingA. is short-circuitedB. carries exactly the rated current.C. is open-circuited.D. carries a higher current than the primary