Q3 (CLO 3-C3)(10 marks)A 2500-V 1200-kVA 0.8-PF-lagging 650-Hz two-pole Y-connected synchronous generator has asynchronous reactance of 1.5 2 and an armature resistance of 0.18 2. At 50 Hz, its friction andwindage losses are 22 kW, and its core losses are 16 kW. The field circuit has a dc voltage of200 V, and the maximum I is 8 A. The resistance of the field circuit is adjustable over the rangefrom 20 to 200 S.The OCC of this generator is shown in Figure (2);Compute following parameters for performance evaluation of the machine;i.The field current required to make V is equal to 2500 V when the generator is running at noload?ii.The internal generated voltage of this machine at rated conditions?iii.The field current required to makeV equal to 2500 V when the generator is running at ratedconditions?iv.The power and torque of generator's prime mover be capable of supplying?Open-circuit terminal voltage. V30002700240021001800150012009006003000.01.02,0203.04.05.06.07.08.09.010.0Field current. AFigure (2): OCC CurvePage 2 of 3

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Answered: Q3 (CLO 3-C3) (10 marks) A 2500-V…

Electric Motor Control

10th Edition

ISBN:9781133702818

Author:Herman

Publisher:Herman

Chapter39: Synchronous Motor Operation

Section: Chapter Questions

Problem 14SQ: Induction motors and welding transformers require magnetizing current, which causes a. lagging power...

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In a certain sub-station, there are 5 d.c. shunt generators in parallel, ench having an armature resistance of 0.1 0, running at the same speed and excited to give equal inducnd emfs Each generator supplies an equal share of a total load of 250 kW at a terminal voltage of 500 V into a load of fixed resistance. If the field current of one generator is raised by 4%, the others remaining unchanged, calculate the power output of each machine and their terminal voltages under these conditions Assume that the speeds remain constant and flux is proportional to field current
and t A common base of 100 MVA and 25 KV is selected. What is the current base (Ig) Select one: O a. 4 KA O b. None of these O c. 6.25 kA O d. 2.309 KA A 100-MVA, 60-kV, three-phase synchronous generator has a synchronous reactance of armature resistance. The generator is operating with an excitation per phase E= 47.116 power before losing synchronism (stability limit). and the armature c Thus, the maximum generated power is Pmax =
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
The power factor of an alternator depends on on Load а. b. Speed of rotor Core losses C. d. Armature losses
• - 1800 pm In a two pole 3-p synchronous generator, the peak flux of rotor magnetic field is o5Tand the rotor rate of rotation is 1800 rpm. The stator windings have a surface area of 0.1 m? and there are 50 turns per Bmax : 0.5T, 0.5T coil. The machine is A-connected. A: 0-1 m? N: 50 a) What is the RMS phase and line voltage of the generator? b) Write the three stator phase voltages as functions of time.
please help how to know if they are given terminal voltage or phase voltate. what is the difference between both and the answer would change?
Please solve this problem step by step and illustrate your answer properly. Write your answer in a piece of paper please. Box the final answer.
SYNCHRONOUS GENERATOR A 13.8 kV, 50-MVA, 0.9 p.f., 60 Hz, four pole, Y-connected synchronous generator has a synchronous reactance of 2.5 ohms, and an armature resistance of 0.2 ohm. At 60 Hz, its friction and windage losses are 1 MW, and its core losses are 1.5 MW. The field circuit has a dc voltage of 120 V, and the maximum field current is 5A. The current of the field circuit is adjustable over the range from 0 to 10 A. The OCC of this generator is shown in the figure.
there may be more than one answer
D2. When a generator's full-load output voltage is the same as its no-load output voltage it is said to be a) under-compounded b) flat-compounded c) over-compounded d) none of the above D3. The output of an overcompounded DC generator can be lowered by use of a a) rheostat connected in series with the series field b) rheostat connected in parallel with the series field c) rheostat connected in parallel with the shunt field d) none of the above D4. When might it be desirable to use an overcompounded generator? a) never b) always c) to compensate for line loss d) when you need a higher no-load voltage than your full-load voltage
Induction motors and welding transformers require magnetizing current, which causes a. lagging power factor. b. leading power factor. c. unity power factor. d. zero power factor.
1. The operation of Commutator in DC Motor is * O a) to convert dc to ac O b) to convert ac to dc O c) to convert fixed dc to variable dc O reverse the current direction in the rotating windings each half turn

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